JLCPCB Prototype for $2(Any Color): https://jlcpcb.com
My new PCB uses a dual 555 timer (it's called a 556) in both astable and monostable modes to produce a variable pulse width oscillator running at about 1kHz.
My new PCB uses a dual 555 timer (it's called a 556) in both astable and monostable modes to produce a variable pulse width oscillator running at about 1kHz.
I would have thought of using the CV pin to connect to the wiper of your variable pot of which both ends connect to supply and negative
Why does it use a 556 as I thought you could do this simple operation with a single oscillator ?
Love the bodged dual 555 timer wiring! Very clean and fun to look at. Excellent work!!!
Does Julian reply to comments?
Nice work…
For variable duty cycle why not use output from a sawtooth generator, fed to a comparator, referenced to a set point voltage?
My fave saw tooth generator… Programmable unijunction relaxation oscillator. Feed capacitor with constant current (withing PUT's rating) , makes capacitor voltage a sawtooth.
If trigger voltage set with a slightly larger constant current through resistor to ground… Latch up is avoided.
Looks like neo-steam punk
Forwarded to Rube Goldberg
I always enjoy a "dead bug" type solder job like you dual 555. LOL Oh, I've also been wondering if you've ever missed around with solar BEAM bots? It seems like something that would be right up your alley. 🙂
An easier way to solder in the pot: don't worry about getting it lined up nicely, just solder one leg in. Then reflow that solder joint while holding the pot in the right alignment, then solder the other two legs.
Is the pot calibrated to Confuciun Logarithms???
Good. God.
Looks like a steam engine.