Analog vs Digital

122

01:21:01

It converts analog to digital. The two transistors(emitters to source) on the left is two digital inverters(analog to digital) and the two transistors(collectors to source) on the right amplifies to the output of the green LED. 

BLUE------ANALOG
GREEN---DIGITAL

published 11 years ago

thebugger

11 years ago

You don't need a Darlington configuration for the green LED. It drops 1.4V unnecessarily. Other than that everything seems to be in order. A semi Schmitt trigger that converts AC to pulse. Nice. I don't like Schmitt triggers for a reason. At higher frequencies the output completely distorts and at 100Mhz you can't even recognize the square wave. That's due to hysteresis and is partially the reason this triggers are not used as a regenerators because at higher stream speeds they tend to distort the signal rather than to restore it. At lower speeds (up to 20Mhz) it works fine and can be used as a regenerator. It works best in the AF spectrum.

hurz

11 years ago

Where do you see a schmitt trigger and its hysteresis? I can see only forward gain and nothing goes back.

thebugger

11 years ago

How unsubstantiated. I see the same configuration as a schmitt trigger or at least very similar. The only thing that lacks this basic topology is the emitter resistor that is common for both emitters but that doesn't seem to be a problem.

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