Making the 555 More Flexible
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- čas přidán 21. 01. 2024
- Independent duty cycle and frequency control over the 555 output
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555 Simulator www.falstad.com/circuit/e-555...
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Golden oldie. I have used the 555 for various projects over the last 50 years; first project was a photo exposure timer, last project was a boost converter for 70V....
Thank you. I purchased a cheap fan controller hobby kit a while ago. It had a similar arrangement of diodes on it. I suspected that it was there to control the duty cycle. I tried to understand the circuit, but I have a long way to go still in understanding electronics. This video confirms my suspicions and helps to understand what is going on. I will be watching this video again for sure. Very helpful.
Great stuff!
Thoroughly explained and enjoyed!
Thanks GR
Finally got this to work. Somewhat fickle for pot settings as it does go very unstable at times.
Nice video. not sure that I've used a 555 in any designs in the past 40 years.
After having issues with spikes on the supply causing all sorts issues with then resetting, glitching and microcontrollers becoming available in 8pin dips there was no looking back.
But i did make a 555 out of a Attiny85 just for a fun video.
One thing I do find is I prefer to use the CMOS version of the 555 because it also avoids the rising edge overshoot spike that the older parts have, and doesn’t draw nearly as much current to run.
The main reason I use 555 when I do is usually because I want to make use of the control voltage to override the frequency particularly for audio synthesizer experimenting.
I used one about 10-15 years ago. Had some dumb software that made you click "Ok" for every item, rather than "Select all, ok", so I jammed a 555 into a mouse to click the button for you. Had a little toggle switch for on & off, even drilled a hole for access to a pot to control the speed. Worked well.
Corporate job, so no installing special software.
As an aside, replacing both resistors with a pot works, but IIRC limits duty cycle to a minimum of 50% or something. Can't remember, too lazy to breadboard.
This circuit works also very well with a single Schmitt trigger inverter. Even more simple 😊