![Martyn Davies](/img/default-banner.jpg)
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Martyn Davies
United Kingdom
Registrace 29. 02. 2012
I am a software engineer, but have been interested in electronics since I was a teenager. On my channel here there's a bit of programming (Raspberry Pi etc), but mostly I'm building things with electronics and explaining (where I know the answers).
Christmas Tree Decoration - Electronic Kit (#158)
Ok, it's not Christmas anymore, but I built the kit anyway.
Kit bought from Aliexpress: www.aliexpress.com/item/1005004646565144.html. About £5 at the time I bought.
Kit bought from Aliexpress: www.aliexpress.com/item/1005004646565144.html. About £5 at the time I bought.
zhlédnutí: 417
Video
Livarno LED lamp tear down and schematic (#157)
zhlédnutí 548Před rokem
This LED lamp from Lidl is being retired to a charity shop, but before it goes let's have a look inside. 00:00 Sorry 00:23 Intro 01:45 Power brick 03:17 Dimensions and demo 05:15 Lamp tear down, first the base 08:26 Measure voltage under load 09:26 Teardown LED unit 11:23 How it works, with schematic 13:27 Reassemble 15:34 Still working!
Building another Bench PSU - part 1 (#156)
zhlédnutí 647Před rokem
Not that I need any more power supplies, but I have a small switch-mode module and a buck-boost module (XYS 3580), so let's build one. 00:00 Intro 00:28 Connectors / adjuster 01:15 Buck-boost 01:50 Power up test 02:20 Input voltage check 03:26 Output voltage 03:59 Voltage adjustment 04:58 Wire up the buck-boost 05:59 Check module setup 07:04 Enclosure unboxing 08:25 Layout check 09:11 Wrap-up S...
Compact 30V Boost Converter (#155)
zhlédnutí 252Před rokem
This little board I received as a free gift as part of a larger order of components from icstation.com. It's actually been waiting around for half a year for me to get around to this video. Let's power it up and see what it can do. 00:00 Intro 00:50 Wires added on 01:12 Design 02:25 Wiring up 03:15 Power on 04:15 Max Volts 04:42 Minimum input Volts 06:10 Last words
Compact Power Supply XYS 3580 (#154)
zhlédnutí 1,6KPřed rokem
A first look at this compact power supply that has the same form factor as the DPS (Ruideng) power supplies sometimes featured on the channel before. This one is a buck/boost converter too and has a couple of extra nifty features. www.aliexpress.com/item/1005003563431790.html 00:00 Intro 01:45 Power-on and a look at the screens 03:33 That trick it does 04:50 Add a load resistor and experiment 1...
Standby Power Supply (#153)
zhlédnutí 385Před rokem
This power supply from icstation is in an extremely small package and allows you to run low power devices from the mains. I paid about $3 for it in January, but the price is still similar now (August). It's good for applications where you need a small amount of current (0.5 A), for example to drive something in stand-by. www.icstation.com/220v-600ma-switch-power-supply-module-isolated-power-mod...
USB PD Control Board (#152)
zhlédnutí 3,7KPřed rokem
I wasn't 100% sure what I'd bought here from icstation.com, but it allows you to control a USB C/USB PD power supply and select a voltage. Also allows you to release the magic smoke. www.icstation.com/pd2030-secoy-trigger-motherboard-module-100w-output-voltage-9v12v15v20v-adjustable-power-supplies-with-protocol-p-15769.html Was around $6 when I bought it; 6 months later (Aug '22) it's around $8.
Teardown of Behringer Power Supply (#151)
zhlédnutí 9KPřed rokem
A quite new power supply failed, so let's do a quick one-way teardown.
Teardown of Two Battery Testers (#150)
zhlédnutí 2,2KPřed rokem
The BT-168 and BT-168D are cheap battery testers, available from a number of vendors. The first has a moving coil meter, the second LCD. Let's open them up and see what kind of electronics is inside. 00:00 Intro 01:00 Trying the BT-168 (analogue) 02:01 Compare with multimeter reading 03:25 Open up the BT-168 04:49 Schematic for BT-168 and explanation 08:03 Trying the BT-168D (digital readout) 0...
USB Charger Tear Down (#149)
zhlédnutí 1,8KPřed rokem
This 4-port Teyasi USB charger doesn't seem to have fast charging (at least for my Android devices), so let's take it apart and see what's in there. 0:00 Intro to USB charger 0:42 Specification of the unit 1:15 Strategy to open it 1:24 In like Flynn 2:00 Looking at the layout 2:52 Discoveries 4:30 What's happening with D /D- 5:17 Mains-side 5:50 Full-bridge rectifier! 6:23 Summary Teyasi charge...
USB Charge Doctor - Modifications/Repair (#148)
zhlédnutí 328Před 2 lety
This USB Charge Doctor (Voltmeter/Ammeter for USB) has a dodgy USB connector (tight and easy to get upside-down), so I decided to replace the connector. 0:00 Introduction 0:30 Problems with this device 2:05 My plan 2:42 Steel removed 3:10 Old connector desoldered 3:57 Solder new connector 7:44 Test 9:04 Put case back on 10:13 Final test
Teardown and Repair of Old School Transformer Power Supply (#147)
zhlédnutí 640Před 2 lety
I have a couple of these China-made mpw PSUs from 20 years ago. This one could do with a repair, so let's open it up. 00:00 - A damaged linear power supply 01:20 - Compare to a modern switch mode PSU 02:20 - Open it up 05:11 - Schematic 06:42 - Repairs 07:55 - Capacitor out 08:11 - New capacitor 09:09 - Re-fit wires 11:33 - Reassembly 12:49 - Testing 13:51 - Roundup
Old Bench Power Supply Teardown (#146)
zhlédnutí 212Před 2 lety
I used to use this old power supply for my electronic projects, but it's been retired in the loft for at least 5 years. Let's fire it up and explain the design.
8x8 LED Displays with MAX7219 and Arduino (#144)
zhlédnutí 976Před 2 lety
These MAX7219 displays can be daisy chained to an arbitrary size, so are quite nice for animated text output. Here we use Arduino (the 2560 Mega Pro clone that I've shown before) and the Parola library to animate text and sprites. MAX7219 Datasheet: datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf Parola: www.arduino.cc/reference/en/libraries/md_parola/ Example supplier for 8x8 displays...
TM1638 Display Module with BBC micro:bit (#143)
zhlédnutí 1,2KPřed 2 lety
TM1638 Display Module with BBC micro:bit (#143)
TM1638 Display Module with Arduino Mega Pro (#142)
zhlédnutí 5KPřed 2 lety
TM1638 Display Module with Arduino Mega Pro (#142)
Another Fidget Spinner Electronic Kit (#139)
zhlédnutí 256Před 2 lety
Another Fidget Spinner Electronic Kit (#139)
Inexpensive Bluetooth Speaker Kit (#138)
zhlédnutí 18KPřed 2 lety
Inexpensive Bluetooth Speaker Kit (#138)
Waveshare Raspberry Pi Pico Clock Kit (#137)
zhlédnutí 6KPřed 2 lety
Waveshare Raspberry Pi Pico Clock Kit (#137)
USB "C" Laptop Power Supply - Quick Test (#136)
zhlédnutí 1,8KPřed 2 lety
USB "C" Laptop Power Supply - Quick Test (#136)
Electronic Fidget Spinner - Kit Build (#135)
zhlédnutí 444Před 2 lety
Electronic Fidget Spinner - Kit Build (#135)
A-to-D converter with the Raspberry Pi Zero W - ADS1015 (#133)
zhlédnutí 3,7KPřed 3 lety
A-to-D converter with the Raspberry Pi Zero W - ADS1015 (#133)
USB C Power Supply Build, Part 2 (#132)
zhlédnutí 7KPřed 3 lety
USB C Power Supply Build, Part 2 (#132)
USB C Power Supply Build, Part 1 (#131)
zhlédnutí 14KPřed 3 lety
USB C Power Supply Build, Part 1 (#131)
Replacing the Bridge Rectifier in my Desktop Power Supply Unit (#129)
zhlédnutí 739Před 3 lety
Replacing the Bridge Rectifier in my Desktop Power Supply Unit (#129)
How do you write the characters for Nobleman
Nice pen
Is this app free?
Google Translate? Yes, I believe it still is. Call up the Play Store and it will tell you.
Is this
Hello Sir, I am facing issues with SIM800L Module it is able to make and receives calls also receives SMS Correctly but when I send SMS using SIM800L it sends some annoying text like " 2 ù 6h l ¿0fH£@@ " , I tested with different power supply with different codes different troubleshooting but not works can you please tell how can I resolve this?
Thank you so much for clarifying me about 433mhz. I bought one receiver and a remote. But I don’t know why the distance is too short (abt 17cm) even I tried to use antenna of 17.2cm. Do you know what happened to my receiver?
To be honest, I haven't tried to see what distances it will work, but I seem to remember that someone on YT has done a video on this.
I would recommend using .6 mm solder and soldering the smt chip first. It's good to see I'm not the only one with issues soldering that chip.
I dislike the smd chips as well. My recent kit has 3 to solder. Im watching several videos before I attempt it. You make it look easy.
Thanks!
Excellent description of this system! Thank You! Which now inspires some questions! PLEASE bear with me here. The frequency number mentioned is 433 MHz. I'm guessing that it is exactly 433.000, correct? So since this is probably right, then if I had more than one of these transmitters, they would all be on 433 and so all receivers are tuned to the same 433.000, correct? If so then if two or more transmitters are transmitting simultaneously, then the receivers would all hear/receive all transmitters at once?! Correct? Since the receivers are not using a crystal for the receive frequency, It appears that the receiver is somewhat wide banded and tunable as you mention. What I would like to do is use this system but have no transmitter/receiver pair interfere with each other. By them all being on the same frequency, 443.000 this has to be a problem. Can the transmit crystal/oscillator be changed to a slightly different frequency and then retune the receiver to that new frequency? I'm thinking it should be able to do this. The replacement 'oscillator' I would use is a SiT8008B programmable IC. What I would like to do is use a few of these in somewhat close proximity of each other without any of them causing interference with the others. Yout thoughts Sir? Thank you very much! Cheers!
If multiple transmitters send at the same time, then yes interference can happen. However this scheme only sends carrier for 1's, so you might get away with having multiple transmitters as long as they're sending infrequently. Also, stronger signals (e.g. closer modules) will likely get precedence over weaker. These are very simple radios and don't have features for contention, security, acknowledgements etc. For complex scenarios, you might switch to OFDM, bluetooth, Lora etc.
@@MartynDavies Thank You! I will also be checking out the HC12 module in which you can program it for slightly different frequencies. That way they should not interfere with others.
Definitely need to save those speakers from the dump. I'm running 4.99 a piece JVC's from Goodwill with my setup. Definitely don't want to toss the JVC's or any Pioneers for that matter.
Was there much point in working out the +- 18 v before adding the capacitors? Getting +- 26.5 v with the capacitors and no load was no surprise. (beginner) Would regulated up to about +- 20 v have been achievable (depending on load)?
Thank you Martyn. Much appreciated. I owe you a beer, or something. :)
Спасибо вам, не мог найти даташит на микросхему, а вы помогли❤
Thank you for this video. Please tell me how to set 100khz to 150 khz frequency with this
I can't immediately lay my hands on a board at the moment, but 100kHz would be 1.0.0. There's some data on the icstation website: www.icstation.com/signal-generator-pulse-frequency-duty-cycle-adjustable-module-display-150khz-p-12477.html
ขอโค้ดหน่อยครับ
In the description
NANO? its a pico !!
I think I wrote that somewhere
Not sure if you are still about but thanks for the video as I will attempt to build this myself 1st time hope it works
I have the same clock I have a problem with the s1 touch button it doesn't work I can't change hour and minute
I would check with a multimeter that the switch is not shorted out. Then, usually the switches have a resistor on one side, a pull-up to +V or 5V, then the switch connects to ground when you press the button; this gives quite an easy way for the microprocessor to sense pressed vs unpressed. You can check this out with a multimeter.
Can you add a load to a lcd one, so that it actually loads the battery?
Thank you 👍
Please, does anyone know how to configure the account on the Sinilink MODEL ESP8285H18, I can't configure it on my cell phone or computer Please, does anyone know how to set up the account on Sinilink, I can't set it up on my cell phone or computer
I'm kinda new to this and indeed like the comments mentioned this is also for me one of the first YT videos I watched. Am I correct to assume that with this module you can only light up one digit at a time? So for example when you want to write 1234 it's rendered as 1 ..... 2..... 3... 4... but because it goes really fast you don't see that refresh. Or is there a method to sent the 4 digits at ones instead of in a for-loop? And thanks for the explanantion :)
I think this is the first time CZcams recommended your channel to me. Good stuff, subscribed!
Damn it anyways..... Now I had to buy one. As if I don't have enough to do! Thanks a lot. 🤪
Great job😁 what battery is used? my kit was missing :(
It's a CR1220
if someone sniffs and copies the transmitter and replays it? Is there any security in these modules?
No, there's no security. It sends a simple signal and in the clear, so is easily compromised.
I build this clock and everything works accept the thermistor temp read out. . When it switches to temperature I get P1C or U1C. Its like its getting a bad signal. Solder connections appear good and LDR is working. Any ideas what might cause it?
You could measure the thermistor with a multimeter to make sure it's not open circuit or short circuit. Also perhaps put a 10k resistor in instead of the thermistor and see if the display reads something sensible. If I find my clock, I'll measure the resistance of the thermistor for comparison.
Great troubleshooting. Thanks
You need to remove that white seal on the speaker
I think that I talked about that
If you just want a MP3 player with a built in speaker, the Retekess V115 is really quite decent. has a micro SD card. plus it's a radio so if you want to listen to the radio it gets pretty good reception. but you can also use a USB cable or line in for audio as well.
не работает шипит и все
Sorry to hear that. I seem to remember adding a really antenna to get a better signal.
Does anyone know how to fix the error CMS: 500
When I input the command AP+ csq it outputs 20,99. I can’t figure out why it is picking up little to no signal and therefore will not send an sms
hello I need this power supply, I can't find it in my country, how can I get it thank you
Yes, these old-school transformers can be hard to find. They turn up occasionally on ebay.
@@MartynDavies Ok thank you
Hi Martyn, I’ve just built one of these. You mentioned that the LDR didn’t seem to do anything. There is a software switch for this in the same way that there is for the alarm. You scrolled through the second switch when demonstrating how to set the clock and alarm. It’s the second set of four zeros. You can toggle them to 1’s and it activates the LDR. The brightness of the LED’s will then dim (not much) when the ambient light drops. Good video.
Thanks for the info
Where did you find the setting instructions? The page I found had the build instructions but the images were missing.
There are a couple of these on ebay,one goes up to +-24v dc,for any op-amp and i have a need for this myself for a commercial product,i think going higher then regulating down with a fixed regulator of 78 and 79 types to make sure that the supplies remain fixed and steady. Also using the ic along with the data sheet and the purchased module allows you to integrate the circuit into your own design rather than trying to tack on a daughter pcb,which is a bit clunky,I will admit i that i wall also do this but for a 3.7v lipo to 5v usb for use on a pair of hdmi video goggles a rca to hdmi converter to be used with a fpv quad copter along with the quad copter box goggles via the goggles output. But i have the op amp supply to sort out because as of now i am using a switching capacitive inverter ic and these are no longer made in the voltage regions i need ie up to op-amp rail values such as the max1044 or the ICL7660 both no longer made as far as i know and i had to buy a bunch of 7660s on fleabay i got a good price but some peeps go OTT on them,so a proper smps inverter has been in mind for a while now. A bit of back engineering and some data sheets will sort this thorn in the alberts.
hey you know if i can run this board as a joystick pedals controller?
It depends what you're trying to do. It has a CH340 chip on it for the USB interface, similar to the Arduino Uno, so basically you can follow any joystick project that uses the Uno. Some projects need a different controller that can look like a HID controller (keyboard, mouse) to a PC, for example the ATmega32u4 that appears on the Arduino Leonardo.
good video, use 4v to main VCC with a 1000uf cap, because wen he burst signal needs 2A, at the RX put a resistor devider on RX of 10k on signal and 20k to ground, the rx are not 5v tollerant.
❤😂😂😂🎉
Very helpful video
Beautiful explanation, thanks for posting..
4th unused pin is analog receive?
Just joined to the other centre pin
A mi me llego todo apretado en una bolsa. Y sobran 2 diodos y un condensador de 470 uf que no aparece en el esquema.
Por donde lo compraste
Sir We can use Airtel 4g sim?
I'm sorry, I don't know, but if the Airtel SIM will work in a 2G phone, then it should also work in one of these modules.
I got and built this last week and it worked great for a couple of day, but nownthe BT does not show up anymore :^(
As far as I know, it listens for pairing for a short time after power-on. I'm not sure that there is any way to force the player to rescan other than power-off/on. You can try doing "forget device" on your phone/tablet, switch to airplane mode and back on again, then you can be sure that it will scan and try to attach anew.
@MartynDavies I tried forget the device, and now the YMxx is not advertised anymore, lol. Checked with 2 phones
Yes that does sound busted
Thanks Martyn. A major factor, when deciding which of the available alternatives to go for, was this video and I decided on the Pico Clock Green as a result. It's now all together and working perfectly. The Pico Clock green features a highly accurate DS3231SN RTC controller which is one of my favourites and another deciding factor. I have but one query; I was wondering how one updates the onboard RTC rather than manually setting the date/time with the side buttons. Is there any way to do that? Google is not being very helpful in that respect.Thanks in advance for any information, and thanks again for your video.
I think the software I was using is fairly barebones and didn't have that. There are more choices now (I saw there was a Python version open sourced). I want to go back to this at some point and add some custom features, like automatic daylight savings adjustment.
Thanks for a great guide. I managed to connect my BT-338 as you described. I get data in "serial". But how do I make rfcomm1 available to other programs? Eg Open Plotter and Open CPN? I tried to add aconnection in OPENCPN with /dev/rfcomm1 but that did not work.
It may be that the application can't see the device due to user rights. You could try running as super user, or I think you can add normal users to the 'dialout' group to get access to serial devices.
That is so cool! I feel like it's something James Bond would have, but it's actually real! And I can't believe your video is 3 yrs old! Boy, am I behind the times!
It is astonishing, and 20 years ago no one would have imagined that this would be possible.
Very nice info and detail have you used these with your own circuit