Transistor Schmitt Trigger Oscillator - copy

316

03:13:53

Rather nicer with a class-B like driver stage. Now, there's only one resistor involved with the capacitor.

The switch on the right makes it a voltage controlled oscilator, but it doesn't work as well as I'd like. I tried 2 matched fets too, but that wasn't any better.

The extra AC source is for controlling simulation speed.

published 8 years ago

hurz

8 years ago

Sorry its getting to quick too complicated before the basic problems for a real implementations are detected and solved! I recommand you go a few steps back to your post about a two stage amplifier and try this to build it on a breadboard, if you like. I like what you are doing here, but I miss the link to some practical results. Do not understand this as bad critic. See this more as my full attention I m willing to spend for users like you! Keep it up please!

eekee

8 years ago

Thannks hurz! I appreciate your comments. This is good motivation to throw out my junk and find my breadboards, lol.

hurz

8 years ago

Here an example of a problem you will face on a breadboard http://everycircuit.com/circuit/4555427644964864

eekee

8 years ago

@hurz: It's sensitive to transistor gain, yup. I went back to my plain schmitt trigger, tweaked gain & added negative feedback. The feedback helps but it's still sensitive: http://everycircuit.com/circuit/5387003173797888

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