relays or onto for preamp channel switching Q

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relays or onto for preamp channel switching Q

Postby chicago_mike » 14 Sep 2016, 20:36

So I am in the design process of a 2 channel bass preamp. Nothing fancy..

one channel fender / alembic/ aguilarish, second channel ampeg like.

I'd like to be able to use relays or onto for channel switching but cannot find any articles.

Anybody got something like this?
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Re: relays or onto for preamp channel switching Q

Postby toneman » 14 Sep 2016, 23:40

do u mean "relays or "OPTO" for preamp......"?

5V reed relays have small size and low power requirements.

"Optos" are light-dependent-resistors, and do not provide full isolation.

8)
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Re: relays or onto for preamp channel switching Q

Postby chicago_mike » 15 Sep 2016, 17:13

A circuit really. Something that shows a simple channel switch idea.

I think I found a couple things tho. 8)
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Re: relays or onto for preamp channel switching Q

Postby Fender3D » 16 Sep 2016, 14:13

chicago_mike wrote:...Something that shows a simple channel switch idea...


Hi Mike

Well it depends on the circuit you're working on..
I mean, does it share any preamp stage or tone stage between channels?
On a guitar tube preamp I built years ago, I used reed relays bypassing (or not bypassing) triodes in series and selecting tonestacks.
They're quite noiseless and affordable. You can use any relay bypass circuit you find here around.

I also modified several Soldano's SP77 to solve their "channel bleeding" opto's issue...
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Re: relays or onto for preamp channel switching Q

Postby roseblood11 » 16 Sep 2016, 20:59

Have a look at the schematic for the Carvin Vintage 33 at carvinmuseum.com
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