Another Set - Reset - Toggle

194

03:04:03

A trigger with set, reset, and toggle buttons.

One capacitor less than the other version; uses pnp transistors with smaller beta (ex. soviet МП13Б from around 1975).

published 11 years ago

hurz

11 years ago

But the beta has to match perfectly 😉

stanislav_maslovski

11 years ago

mm, if you adjust the value of the 680 Ohm resistor you can circumvent the difference in beta. But more importantly, this circuit does not suppress the contact noise, so it is of academical interest mostly :) The previous one with one more cap has no such problem.

Sine_eyed

11 years ago

I've never had good luck with PNPs, in sim or for real. It's probably a shame too- @Secuture advocated them in many examples..

stanislav_maslovski

11 years ago

I still have a bunch of them from old good times...

Jeff423

11 years ago

hey guy, Iike so much of your circuit but when I try to do this circuit the toggle button doens't work please enter in contat giovanni.almeida423@gmail.com

stanislav_maslovski

11 years ago

Jeff423, this one is tricky: you need to tune the base resistors and the 680 Ohm resistor for it to work, the circuit is sensitive to transistors beta.

Redstone_guy

2 years ago

Is there an NPN version?

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