modified 6 years ago

Soft mute question

01:13:40

I'm trying to design a signal muting, or rather, unmuting circuit for my Harpejji build. 
I think I'm close here. The signal unmutes over some 10 milliseconds, which is the desired effect. However I can't seem to get it to do so symmetrically. In tinkering with the components and routing I always get a big difference in unmuting speed between the positive and negative parts of the signal. 
Any suggestions?

published 6 years ago

kiani

6 years ago

Try a little feedback. Ie. A resistor (100k} from collector to base! Maybe!

Jantjeharing

6 years ago

Thanks for your suggestion kiani. Alas, this only influences the muting transient and leaves the unmuting transient untouched. And the asymmetrical characteristic is not negated.

2ctiby

6 years ago

400mV instead of your 500mV a.c. amplitude?

Jantjeharing

6 years ago

I've got it. The base supply circuit should be mirrored to the negative side of the supply. To supply a PNP transistor. This way you get two shunts to ground. Both working on different sides of the signal. I'm glad.

Jantjeharing

6 years ago

See http://everycircuit.com/circuit/5738308081287168

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