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October 21, 2021, 08:51:21 AM

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Author Topic: Remote channel/FX switch  (Read 69 times)

ampetrosillo

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Remote channel/FX switch
« on: October 20, 2021, 10:51:02 AM »
I'd like to implement a clean/dirty channel switch for my design, and also a vibrato/reverb on-off switch. I'm using DG419 parts (nice and reliable, clean if a bit fast, etc.) for switching, although I could use simple relays as well (but the cost and complexity is basically the same, with the added bonus that the DG part is solid state, therefore potentially more reliable) and I'd like to be able to both operate the switch from the panel and via a footswitch. Are there any schematics you could point me to? Secondly, I'd actually like to have a remote reverb mixer (as well as the panel-mounted one), this screams VCA of course, but what would you suggest?

Enzo

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Re: Remote channel/FX switch
« Reply #1 on: October 20, 2021, 10:05:11 PM »
RElays are clean, and can switch signal at 40mv or 40 volts  Relays let you control completely isolated from the signal path.  I have found them darn reliable over my decades.  I have replaced a few, but that is in thousands of amps. 

But I expect relays to be here a long long time.  DG419?   And when they stop making them?  Remember the useful TL604 that were used in large numbers in the 1980s?  GOne now.

Don't get me wrong, if you have a useful design based on them, go ahead.   I just didn't buy the backup argument

A common approach to using a FS and panel switch is to run them in series.  The FS jack between panel switch and ground, with its normal shunt completing the circuit when no FS is used.

A remote level control?  I'd hate to run the signal path outside the amp and back.  If you want to run a control voltage, you'd have to have a supply out to the FS, and make up a control circuit there.  VCA?  Would work, I don't know what is current in VCA chips.  On th other hand a simple digital pot would likely work too.