VCA

188

04:10:28

Simple VCA using differential pair  and current mirror

published 9 years ago

hurz

9 years ago

Sorry, but to understand how it works i simplified it a little. Check this http://everycircuit.com/circuit/5221785158549504 Keep it up!

Janvier

9 years ago

No needs to be sorry ;)

Janvier

9 years ago

I modify the circuit ... There was some error in the current mirror configiration.

hurz

9 years ago

I still dont see a good reason for a simple demonstration why opamps are needed. They hide the core information/knowledge of this nice circuit. Whats absolut not needed now is the 500Hz ac source http://everycircuit.com/circuit/6709445630885888

Janvier

9 years ago

It for test purpose for a design I working on. But to explain for people which don't understand... The opamp at the output is configure as difference amplifier to cancel out the DC component on each collector of the differential pair. The pot. on the top of the diff.pair is there to offset the center of the signal at the output of the opamp (in real life with poor component this is needed if you care how your output is centered otherwise this can be removed).

hurz

9 years ago

I know what it is all around, however, keep it simple!

Janvier

9 years ago

Im not explaining for you... Im explaining for others which might not understand. The goal here wasn't to keep it simple ;) !!

hurz

9 years ago

Its ok, if you think "people" understand best what a VCA is all about. IMHO, i wont do a demostration that way. Anyway, keep it up!

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