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tuopeek
United Kingdom
Registrace 3. 04. 2011
Experiments, Physics, Electronics, High voltages and Projects. Also any old Electronic and Electrical stuff that should really be in a museum.
More at: www.tuopeek.com
More at: www.tuopeek.com
L-C Oscillators With High Voltage Fields
There are a lot of videos on CZcams using these using these simple L-C single driver oscillators. They never cease to amaze, as in this case they are often running from supply voltages of less than 20V. However, the RF fields created around the coil and capacitor can be high enough to create discharges in gasses that would take more than 1kV to strike. This video show some of the fun creating plasma ball in tubes from different gasses and vapour.
While the supply voltage is low the L-C voltage and current can be high and it is very easy to receive RF burns from getting too close to the field.
While the supply voltage is low the L-C voltage and current can be high and it is very easy to receive RF burns from getting too close to the field.
zhlédnutí: 729
Video
Klingsor phonograph
zhlédnutí 78Před měsícem
Something mechanical for a change. This ‘Klingsor’ phonograph (record player) dates from the early 1900s and has no electrical parts yet plays old 78 rpm records at a surprisingly loud volume. It had a fault which prevented it from being wound up. Rather than a ratchet to hold spring tension, as found in clocks, it has a small spring which locks around the winding shaft preventing it from unwin...
Tube Driven Air-Core Transformers
zhlédnutí 324Před 2 měsíci
A couple of interesting old air-cored transformers turned up. It’s quire rare to find these in high voltage power supplies even in back in the days of vacuum tubes (valves). For novelty, I decided to have a go at driving these transformers with tube drivers as they were intended and investigate the design further. CONTENT: 00:00 - Intro 00:50 - 2nd circuit 01:58 - 1st circuit detail 02:09 - dri...
Walk through and repair of a Philips N7150 reel to reel tape recorder
zhlédnutí 584Před 3 měsíci
Decided to do a few repair on this 1980s reel to reel tape recorder. Although obsolete and not even all that popular in its time, with the introduction of the compact cassette, they produced a superior audio quality. Even today, could be arguably considered better than some compressed digital formats. CONTENT: 00:00 - Intro 00:06 - Info. 00:57- Faults 03:20 - VU meter back light 04:45 - Reassem...
Lucas-Hitachi 14CUX electronic injection system used with Rover V8 engines
zhlédnutí 225Před 3 měsíci
A short video on the electronics for an old fuel injection system for the Rover V8 engine. This engine was used by Land Rover for many years and a popular transplant in other cars. Although both the engine and injection system are now obsolete there are still enthusiasts for it. It also demonstrates an early 8-bit dedicated computer engine management system without it being buried in infotainme...
Not the usual boring Relay
zhlédnutí 378Před 5 měsíci
Thought this relay was worth demonstrating, as it uses some extra applied physics in its operation. The relay is designed for DC circuits. With large DC voltages, if an arc forms as a DC circuit opens, it is more difficult to break than for the equivalent AC voltage. This is why you will sometimes see two ratings on a switch one for AC the other for DC. With modern DC circuit in EVs and PV syst...
Magnetic Beam Focusing on a CRT
zhlédnutí 464Před 5 měsíci
This short video, the first for this year, explores magnetic electron beam focusing. It showcases an early method employed in electron guns to generate the necessary sharp dot on cathode ray tube screens. Two relatively large magnets are positioned on the tube neck and mechanically moved towards or away from each other to modify the electron path, bringing it into focus on the screen. The assem...
Wheatstone Bridge
zhlédnutí 857Před 7 měsíci
You might remember these old Wheatstone Bridges from school physics and probably weren’t too impressed. I got hold of this old one and decided to make a short video on it as a teaching aid. Hopefully it is a little clearer or slightly more interesting than normal. CONTENT: 00:01 intro: 00:25 - theory: 02:08 - Decade resistor bridge: 05:01 - wirelength bridge theory: 06:26 - wire bridge test: 07...
Fault finding a power issue in a Laser level tool
zhlédnutí 1,3KPřed 8 měsíci
Short video on repairing a Laser-Level tool. This is quite an expensive bit of kit and rendered useless by a cheap component. The repair would have been very difficult given the lack of information, but thanks to a picture search an information trail appeared. The small Buck-Boost controller on the power supply board had cooked to the point no part numbers were visible. Even if it had been it w...
Old Vintage Analogue Meters
zhlédnutí 206Před 8 měsíci
Sticking to the theme of vintage technology, I thought it would be interesting to look at the construction of some old analogue current and volt meters. CONTENT: 00:04 - Intro 00:20 - Moving coil meter 01:00 - Moving Iron meter 01:50 - Construction of early type 04:54 - Temperature difference current meter 06:38 - 3ph kWh meter stop mechanism 08:15 - thanks
Radio Chassis from the 1930s
zhlédnutí 541Před 9 měsíci
This radio chassis dates from the 1930s I’ve owned it from the 1980s when I was given it to play with. Unfortunately, only being interested in the electronics, I quickly ditched the nice wooden casing and kept the chassis and speaker. Every time I have connected it up it has surprised me by working, despite a long time sitting in an attic. Most equipment of this age requires a lot of reworks wi...
Tracing Gremlins in a Tektronix (main-frame) Oscilloscope power supply.
zhlédnutí 504Před 11 měsíci
By my standards, this is quite a long video. This 7854 oscilloscope has a power supply fault that is proving elusive to find. It’s also quite complex, so easy to add additional faults if clumsy. It is so well made I am reluctant to give up on it, despite many modern digital scope’s specifications surpassing this one these days. Repairing Switch-Mode power supplies can be challenging and this on...
Electrostatic deflection (scope-type) CRT set-up
zhlédnutí 380Před rokem
After my video on the electron mass, I thought its worth looking at setting up and electrostatic deflection tube basics to produce a dot on the screen. Although the acceleration voltages in these tubes are lower the electron gun assemblies can be a little more complicated than in an old TV CRT. CONTENT: 00:00 - Intro 00:24 - driving CRT 00:56 - electron gun assembly 02:20 - Problems with stray ...
Shocking back-EMF
zhlédnutí 767Před rokem
Everyone knows transformers don’t work with DC current, but anyone playing with batteries and coils probably know it’s a good way of receiving a shock. Connecting and disconnecting a DC supply to an inductor means there is a period of change and therefore not DC. This induces back EMF in the coil and is how ignition coils and fly-back transformers are driven. It is well known that capacitors ca...
Introduction to particle accelerators using a CRT
zhlédnutí 981Před rokem
This is an unusual experiment using an oscilloscope CRT found in an old college text book on Physics and Electricity. A conventional CRO, or in my case, WWII radar tube can be used to calculate the charge to mass ratio for an electron. This can be extended to examine the relativistic nature of mass with high electron speeds. The cathode ray tube is set-up as it would be in an oscilloscope for b...
Vintage TEK 7603 main frame scope repair
zhlédnutí 434Před rokem
Vintage TEK 7603 main frame scope repair
High voltage transformer from large X-ray supply
zhlédnutí 1,5KPřed 2 lety
High voltage transformer from large X-ray supply
One time when we were visiting Photonicinduction, he blew up a 90W SOX lamp that had failed due to one of the electrodes becoming detached and rattling around in the arc tube. I think it got up to 4000V or something approaching that, before it went bang and caught fire. Then the ceramic lampholder cracked...😋 Then he poured water on the liquid sodium that had dropped onto the carpet..! (Yep, more burn marks on the famous carpet.) 🤣
3:53 i see horizontal ghosting
Think it's the beat frequency as not synchronised with the camera
@@tuopeeks I'm not talking about the camera issue. my crt does the horizontal ghosting/horizontal double image
@@navysealscopypasta9 didn't spot that, will look at it again. Not sure where that would come from. Think I was using composite video here.
Am I right in suspecting that you've opened that up before? The deftness and confidence gave you away 😅
😁Yes, I had been once before but the reason for opening it up and the video was the locking spring had failed and I suspected the spring had broken somewhere.
Can you make a singing plasma toroid? The colors in that lamp look like neon/argon penning mixture.
Technically possible, but toroid stability may make it difficult to work well and modulation needs to be added to the electronics. The sound level is also quite low. Yes, think you are correct the lamp is likely to be a mixture or argon and neon, and also feature in the plasma globe. This is a popular mix of gasses as the combination can reduce the strike voltage to considerably less than for either gas on its own.
@@tuopeeks Penning mixture. They use that as a starter mix for vapor arc lamps.
I found the circuit diagram eventually. Thanks for sharing. I have a quick question: Which one of the two coils in your diagram is the one through which you put the lamps? The one marked 6Turns or the one marked with the dashes (---)? Can you also please give more details about the coil or transformer marked with dashes? I would very much like to replicate this setup.
The coil on the right marked 6 turns is the main LC coil. The dashed lines indicate I've used a ferrite core and this coil is a blocking filter to prevent the HF feeding into the DC supply. Its not critical and doesn't need to have a core but it should have more turns than the oscillator. The most critical thing with the coils is the current the can handle. The oscillator coil wire is 3mm in diameter and can run hot. Not only voltage is high but current too.
@@tuopeeks thanks. I was wondering if you could do voltage and current waveforms across and through the oscillator coil? That would be very informative, I would imagine.
@@Baraka-yl2dp It's not too exciting and would really need another video to do that. The LC wave-form is more or less a perfect sine wave when working properly. Measuring the current with a scope is much more challenging as this need to be converted to a proportional voltage without distortion. The voltages and currents are very high compare to the supply and at resonance are in phase.
@tuopeeks it may not be exciting but could be informative. In fact, from your statement I can already imagine that it would be informative. The fact that it's a perfect sine wave when a transient decaying LC wave is expected is already exciting and informative enough. Also, the fact that the voltage and current are very high compared to the supply peaks my curiosity already. Please just do the voltage waveform if the current waveform is going to be a pain...
Can you post details of SiC device please. Thanks. Keep up the good work.
I used two devices based on availability, cost, speed and breakdown voltage. The first a SMT device SCT2750NY and the second is through-hole MSC750SMA170B
@@tuopeeks thanks.
I think sharing the oscillator circuit would allow people to also play with it. Please share.
Couldn't share it in the comments so had to put it in 'communities' as a picture.
Hi. Thanks for the video. Can you share the circuit diagram ?
Added a diagram to 'community' as a starting point. There isn't anything crucial but everything seems to affect the behaviour.
I believe the green in the tungar lamp might be coming from a BaO coating on the cathode. Very cool video as usual :)
Thanks for the info haven't looked into it yet, but I did notice the coating on the cathode did produce the colours
@@tuopeeks ahhh, yes that explains it!! BaO is commonly used to aid emission if I remember correctly, and excited Ba produces intense green spectral lines
I believe the green in the tungar lamp might be coming from a BaO coating on the cathode. Very cool video as usual :)
Interesting!
That does look like fun - ty for posting, rly enjoy yr vids. Can i ask what were the L C values, and what transistor worked best. What was supply voltage, cant remember if u said that or not. And is yr adjustable cap homemade? It is awesome, reminds me of a film processor feed thingy, minus fins of course. I really really liked your split diode xray trans dismantle, tour, explanation, circuit diag especially, and synthetic wax pour. I wonder what unit it powered, and whether medical or industrial
The variable capacitor is from a small transmitter, I think. So not home made and larger air gaps than a receiver tuning cap. Value between 50 -110pF . I was mostly using it down at around 50pf and moved to a fixed one at 40pf at one point. Still looking for the best MOSFET but the one I was using here was IRFP260N but have blown a few. Yeah, thanks, the x-ray transformer is nicely made. It was from a medical x-ray supply.
I love this oscillator, definitely build a tube version when i get back in my lab 😃.. thanks for posting, very cool, i really liked the tungar lamp, very interesting, and the plasma spheres in the HC spectral lamps 😎👍
You can add a shunt-capacitor via D-S of mosfet, about 1-5 nF, ceramic cap or low-loss MKP film. The efficiency of the circuit usually increases by one and a half to two times after adding it. The heating of the transistor is reduced by approximately the same amount. Also don't forget about AC voltage (summary with bias) swing on the gate via different loads and tank quality factors. Adding a TVS to G-S is a good decision. And finally - the G-S part is a fraction of the total LC-resonator now. Add 1-5 nf MKP in parallel for bypassing a portion of AC current. This also forms a sort of AC-divider with air-tunable cap, which allows you to fine control of gate AC-overshoot. I developed a push-pull version of this circuit, but in a common drain topology. It turned out to be a very evil thing, for real.
Thanks, as you pointed out, there are a lot of factors to get these performing well. I'll try adding the shunt capacitor as not tried that yet. Also find selecting a MOSFET has a big impact too. Easy to got through them too🙂
As I found out, one of the most important parameters of FET for this circuit is a forward transconductance - larger value is better, especially with low supply voltages (30V and below). Switching times and Rds-on are obviously important too. As a common FET example, showing great results with Vsupp 15-25 V, IRFP4321 is a good one, for frequencies up to 50 MHz.
@@Magic_Tee Yes, the FET used has a very big influence on it working or not. 🙂
It gets brighter when the plasma transitions from a capacitively coupled to an inductively coupled state 👍
Interesting point. There two different coupling mechanisms are very noticeable. Some of the bright flashes with the Tungar lamp are due to sudden evaporation of elements adding to the gasses.
Yep, this circuit is awesome for pumping electrodeless spherical spectral lamps with different metals/gas mixtures. A "ВСБ-2", for instance.
How did you remove the phosphor from that U CFL without opening it?? I'm guessinggggggg......ultrasound jewelry cleaner
Ah, that lamps had a small lose bit inside and I spent some time using it to remove some of the outer coating😁
@@tuopeeks ah. like with a magnet?
@@Muonium1 yup👍
What i nice piece of tech! lovely
The five L/R time constants in the analog meter's "needle deflection" coil could make it unable to show the "delta t" of the back EMF pulse. I'm not sure what chips a modern DVM uses to report voltages but in my Micronta analog multimeter, the deflection mechanism is a large-ish coil that is fed the input signal from the meter's probes when they touch the being-measured circuit. The analog meter itself is an electromagnetic induction device (a coil and magnet) and the ability of a DVM to faithfully indicate the rise time of the back EMF pulse, or better yet, an oscilloscope, just in case the analog meter's internals (the coil inside the meter that takes the input from whatever circuit/device is being measured). I always use an oscilloscope with the input probe set on "x 10" to protect the o'scope. The back EMF spike can be pretty astonishing in - very brief rise time - the voltage magnitude of the spike I love analog meters - when I learned electronics in the U.S. Navy there were no digital multimeters. The one you have looks very robust. .
Yeah the meter won't accurately react, although the field collapse in the large transformer is quite slow. DVM don't react a lot faster than analogue meters in my experience, and are far more susceptible to damage from HV spikes. The scope is the best but also possible to damage the input if not careful. The meter I'm using is old and obsolete here now, but it was always considered a tough and popular instrument in Britain. It was manufactured by Thorn-EMI and known as AVO ( for Amps, Volts, Ohms) .
@@tuopeeks I would never part company with my analog meters. The fact that they are very basic devices is confidence-inspiring. The fewer parts that can break, the better, imo. The one you have looks to have been a high-end one. It's like an old guitar: they are keepers!
. ○ ○ ○ ○ ○ ○ ○ ○ ○
Nice job. That governor is an absolute joy, it'd be interesting to check how stable it is with an optical tacho. I can almost hear Italians weeping into their pesto in the background
Its funny as your demo at the beginning reminded me of the spooky Edison wax cylinder kids Merry Christmas recording 😃
Very cool mate 😃😎
Very nice Kram. Why are there lots of strings traversing the horn? They look like the strings of a musical instrument. I think I even saw rest pins to tune them.
This seems to be particular to the Klingsor company at the time and don't think its documented. It's thought resonance with the strings with the sound improved the overall quality of the sound. I can't confirm this as this example is very out of tune and I haven't tried to tune it.
vc I KNEW that the effect Lennard gives to create a vacuum and fly in the direction that vc want to use in a ship because vc does not face is very interesting
I would have been a bit more gentle with it, they don't grow on trees and are fairly valuable as basically obsolete systems go. 21264 boxes are as nice as these things get after all, in terms of small size alpha systems, there was a time I very much wanted one but I gave up on it as $2k roughly was what they were asking. DS10 and DS20's if memory serves, what would have been cool is running VMS on it pretending it's a big ass 11/780 or so. That's what they are cool for imo, all the other shizz you can do on much more easily available hardware. Except maybe Ultrix, which if I'm not mistaken there theoretically is some reason to run still - I can't remember what though.
Throughout the entire video, I had the feeling that this was a version of a vacuum-tube Tesla coil, but made in a strange manner. Transformers with an air core, in my opinion, are more optimal at higher frequencies, in the region of a few to tens of MHz - fewer turns are needed. Or in the case of very short pulses, but this is a completely different topic. A beautiful compound-filled "keg" asks to insert a core into it and discharge the capacitor to the primary winding. I think the winding insulation will hold it up.
Interesting point to add a core given there is a hole through the transformer. It is slightly tapered for some reason and the high voltage terminal would be extremely close to a core, if fitted. Yes, it is identical to a VTTC except for the large number of turns on the secondary making the inductance 1.2H for this coil. One of my large TC coil measures around 0.15H.
Yes, this is exactly the phenomenon of phosphorescence in these alumina tubes that I'm after. Do you remember the make and model of the second high pressure sodium lamp used here? It looks like it could be GE, but I don't know. Apparently this afterglow is only present on a very select few models and only then of certain years manufactured. Incidentally the demonstration of diatomic sodium vapor molecular absorption causing the arc tube to be colored after shutdown is fantastic here. The exact same vibronic coupling mechanism that gives Iodine its deep violet color and the other halogens their lighter colors.
Can't remember what manufacture produced that bare arc tube it could be GE, I have two other SON lamps that exhibit this behaviour an 'Aura' badged lamp and an 'Eye'. Its seems to be age related more than manufacturer.
This video contains a clip of a very peculiar phenomenon that I have only ever seen one other time in a short video by someone named "Frogz". At 7:50 a mercury vapor or sodium vapor lamp alumina discharge tube is illuminated, and when the arc is extinguished displays EXTREME phosphorescence. Can you please give some details on the exact model of lamp this came from and when it was manufactured? I've never seen phosphorescence like this in a consumer item outside of the ZnS and Sr aluminate phosphor powders. I'm desperate to find one and get the spectrum of the phosphorescence to see what's going on. I think it could be cerium, but the color isn't quite right.
Yes, it's a property of a dopant used in the manufacture of high pressure sodium lamp arc tubes. These are made with sintered aluminium oxide, but many manufacturers now add a dopant to the process. I can't remember off the top of my head what the dopant is/are. What is interesting about this phosphorescence is most of the light emitted is actually in the UV and you just see the visible blue end of the light. I also have a video showing this: at 4:50, czcams.com/video/vnnn3clAEG0/video.htmlsi=bpn0gFCKllV0vvUU
@@tuopeeks cool, I left a comment there.
Cool!
Very interesting... Looking forward to watch your videos. Subscribed 😊
Se colocar duas janelas em um tubo circular poderia haver internações entre raios catódicos e raiis canais"positivos"?
Não creio que assim seja, pois os elétrons e os “raios canal” (+íons), sendo cargas opostas, irão em direções diferentes em um campo elétrico.
☹️ - you had the light level wrong when demonstrating it = washing out the analog meters so we couldn’t see them “swinging”
Yeah, did notice that. I had a bit of video close up shot showing the VU meters operating but removed it because of potential CZcams copyright issues with the music.
The guy makes a free video sharing a repair of this old machine for anyone to enjoy and this is what you say 🤦🏻♂️, I'm sure your content has absolutely perfect light levels and camera angles, oh wait let me guess "this channel does nothing" 😞
🌟 "Promo SM"
Very interesting. One thing I always had problems with was those that used light for the end of tape, finding a bulb to fit some of those was a nightmare.
Thanks, know the types you mean, even early video recorders used small bulbs and photo diodes to detect end of tape. The photo diode would be sensitive to infra-red and the bulb would emit in all directions so could be interesting but fiddly to replace with an LED.
I like that LED filament repair, very tidy.
😀😎👍👍
They still make the Dallas RTC chips. You can easily replace that if you know how to solder. (Or if it's socketed but it did't look like yours was.) I know this was two years ago but it would be nice to see a modern Linux distro on this machine. Gentoo Linux is still available for the Alpha platform. I know that Gentoo is not the easiest OS to install and requires manually compiling packages (I know I've installed and run Gentoo before) but if your up to it and have the knowledge it would be a fun project for this machine. Gentoo does have a very thorough install Wiki that guides you through the installation process. It just takes several hours to do.
good to know the Dallas RTC is still available. This one is still holding out last time I checked. I haven't mucked about with the OS as yet , in fact I there is a newer UNIX version I could use too.
Have you try IGBT in series for switching?
Did look at it at the time but the switching speed was an issue and the SicMOSFETs were way faster
good to know!
Wow. I was logging back onto my workstation at CAT in the 1990's there for a moment. Thanks for the cool video. Brought back some great memories of a young hard chatging engineer!
Interesting it's just rs232 for diagnostics. Makes it easy to hook up!
Almost, but it's not standard RS232 as it's 12V and inverts the Tx signal. So a dedicated cable has to be made to deal with this. It quite straight forward though.
The plot thickens! What are you up to? With more modern do it all ECU's, it's a bit harder to reverse engineer them, which may explain the popularity of aftermarket units. Not long before I get that Speeduino unit I've been talking about, then you can have a poke around that 😉
Wanted to create a spare ECU for a 3.5ltr out of a 3.9ltr ECU but noticed I had a great test-jig as well. Even confirmed quickly I had, as suspected, as sticky extra air valve on the vehicle. Having a bench test arrangement is so much easier than taking the laptop out to the garage and working around the car. The after market option is getting good these days, apparently these old system can get a bit out of breath at high processing speeds.
@@tuopeeks Well done getting some future use out of the old dog. It's a handy thing to have for quick diagnostics. I never looked into them a lot, did you ever figure out how they batch fired the injectors? Nowadays even Arduino processor speeds are way more than older injection systems needed.
Ha cool 😎👍 the diameter of the MAS makes me think shes a thirsty girl 😂...
👏🏻👏🏻👏🏻grazie! 👍🏻
Do they have a digital version of these tubes yet???
The LED bar graph is the closest. The magic-eye remains old vacuum tube tech.
Interesting demo. I saw a lot of this type in the marine environment. Most of them had ceramic arc guides on the blow out end to reduce scorching to the holder, they often looked like the thrust vectoring chutes on jet engines, that may explain the additional bolt hole in the casing. I was told by a manufacturer that the ceramic also helped cool the gas and reduce the ionisation created within the starter cabinet. As Peter mentioned, some larger versions had wound coils with a decay circuit in place of permanent magnets.
Thanks for an interesting and well described résumé of this relay and the magnetic deflection Kram. My mind turns to coils that were often placed in street lamp luminaries with horizontal mercury arc lamps. The coils were in series with the ballast choke and so produced an alternating magnetic field. This kept the arc which was also conducting AC in the centre of the tube as otherwise it would rise up due to convection currents in the carrier gas and would melt the upper surface of tube resulting in lamp failure.
Thanks. Ah yes, the old medium pressure mercury arc lamps. It's impressive enough of a field could be produced at the lamp, with this method, to counteract the convection current.
Thanks for that, what was the voltage on the xenon thyratron? I believe they take quite a high current t fire.
The xenon tube is marked S1,3/30dV and is rated for anode voltage around 1kV with a current of 2.5 A continuous 30A pulse. Trigger current will be small in comparison.
In the video it looks like the high voltage wire goes to the Center section of the transformer
Output from doubler network on the MOT inverter supply to smoothing cap for tube anode in the VTTC
Please give more information on the filter you use between the transformer and Tesla coil
Nothing specific, just a toroidal ferrite core with about 10 turns of thick copper wire. Just to reduce HF noise either way.
i would think think this inductor or choke would cause an issue when the power is stopped as the polarity is reversed in the inductor! do you have a bypass diode on it?@@tuopeeks
@@DaynDickson-bw5wi Its has a tiny inductance and could be omitted. Didn't cause any issues on test. .
What's interesting this specific unit has cdm-0 transport with board that looks identical to cdm-1. I have cd-104 unit with cdm-0 as well but trasport board has completely different design!
I can't account for that, other than the unit developed a fault early on and under warranty. I never figured out the repair other than it was back at Philips for a while. I found an off-cut of wire rattling about inside when it returned. That may account for a board swap. Thanks for the observation.