555 Timer Adjustable Frequency Duty Cycle Circuit sponsored by Solderstick Wire Connectors
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- čas přidán 3. 08. 2024
- 555 Timer Adjustable Frequency Duty Cycle Circuit sponsored by Solderstick Wire Connectors
Get solderstick at 20% OFF with discount code "LE20" at www.solderstick.com/sale
In this video we use a 10k trimmer pot and a small varicap to put a 555 timer into fre running oscillator mode with 50% duty cycle and adjustable frequency.
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Gear I use:
Multimeter: OWON B33+ amzn.to/3UkTJOo
Oscilloscope: KIPRIM DS1202 amzn.to/3gfJGMN
Signal generator: Junctek JDS8080 shorturl.at/ehTZ1
Component Tester: T7 Multifunction amzn.to/3AYY03v
Soldering Station: Sealody ??????? - Věda a technologie
Excellent circuit. I really enjoyed when you would go over basic circuits on the breadboard. Really helped me becoming a better service tech.
Cool 555 vid and looks like a good sponsorship, that's a nice product line.
Thanks!
You bet!
Love your channel. I'm wondering what you use to create PCB patterns?
Cool! (Maybe you should mention for beginners that you use a bench power supply that avoids ground loops)
Hi, informative video! I have a suggestion for a circuit if you don't mind. I tried to build a "555" on a breadboard using an LM393, 74HC74 and 74HC04 with a PNP and NPN transister, it didn't exactly work. I read the data sheets and only some of it soaked in. Maybe I was mixing logic with the wrong idea. I added an LDR in a couple of places to induce a change in the process but all I did was make a fancy "street light". I used the criss cross astable circuit for the clock pulse.There was no reason to make this, just was experimenting....
Lock picking Lawyer! (another one of my favorites!)
Thanks for sharing this video and information. I have subscribed to your channel, appreciate your support in helping review my electronics skills and knowledge.
12:09 LPL reference.. I had just watched his latest before you. Subscribed to both.
Would one be able to control a servo using a 555 timer?
KIPRIM DS1202 is currently unavailable at Amazon. Is there another recommendation and suitable for beginner?
PAUL, how do you fix that ringing or overshoot? Can you make a video lesson about "strapping resistors" and "internodal resistors" when are they used and why are they called strapping resistors and internodal resistors mostly used in power supplies for the filter caps. Guitar amplifiers have a standby switch because of the filter caps need time to charge because this isn't called Time constant because there is no R, so what is it called when a filter cap is charging? its not called time constant or charge time
How would you eliminate the voltage spike at the rising edge of the square wave ? Thanks 😊
Put a cap across pins 1 and 8. I usually use 2.2uF.
I used a 555, varying timing between about 15hz and 0.75hz using a potentiometer. It triggered a transistor, after passing through a diode to keep single polarity, to allow a boosted (via a further transistor adding power) guitar signal to come through in pulses... Even with capacitors stacked on the power rails I got a significant click marking the cycle... Any ideas for cures? (basically want to chop up guitar signal to amp).
@@DeeegerD I might get same effect when I blow my hearing playing too loud, just have to wait for my future hearing aid battery to run out.
add a capacitor in line from 555 output to transistor to smooth the out the spikes would be my guess
@@GeorgeC1andonlyalready got a 10nF mylar capacitor in between 555 output and transistor, haven't tried larger or polarised capacitor yet.
Are you a victim of the notorious 555 "shoot through"? There's a point where both the 555’s output transistors are "on", effectively putting a short across Vcc and ground, generating transients. It's more of a problem with a bipolar 555; try a CMOS 555 instead.
How about trimming a crystal oscillator?
The CD4047 can make 50% duty cycle square waves automatically with one cap and one resistor. f=1/(4.4*RC)
hehehe you need a big old radio tuning cap. Get a dual gang 365pf and you make one up to 730pf.
How would you clean up all that ringing?
Impedance matching at about 33 Ohms
There are multiple factors which can cause ringing. Breadboards / Veroboard are notorious for anything running at relatively high frequencies (each connector row is effectively a capacitor), switching power supplies and long power cables, power supply decoupling (there didn't seem to be any), scope probe compensation (adjustment) or ground connection and external noise from other supplies, lighting etc. Have to eliminate one by one.
Thanks everyone. I now feel enlightened
I am a proponent of trial by fire.
Ah the ubiquitous 555, the most used ic since the 50s.
The 555 timer was introduced in 1972.
Yep, but the 555 is still the most used.
@@warrenking1815 the 555 was the most produced IC at one time. I'm not sure if it still is, or not, today.
According Wiley Brand, publisher (~2016) the 555 timer is one of, if not the most manufactured IC today. Across various manufacturers and regions close to a billion are made and sold each year.
@@adailyllama4786 I am surprised the 555 is still so popular considering how cheap microcontrollers have gotten. I know using a micro where a 555 could work is overkill but I also know that many are apt to do that sort of thing today too.