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svokke 3rd May 2003 10:34 AM

input switching
I would like to do input switching with push buttons and some relais. Has anyone got a schematic for this? I already made some schematics with RS flipflops but they didn't work.
I know how to do it with a PIC processor, but I think this is' a bit "over the top" as I don't need a µcontroller for anything else in my preamp.
Greetings, Svokke

moamps 3rd May 2003 12:04 PM

2 Attachment(s)
try this.


svokke 3rd May 2003 01:51 PM

:bigeyes: thanks, this looks a nice simple solution :bigeyes:
:scratch: why can't I find such a beautiful solution myself. My failed attempts were using a FF, an invertor, a buffer and I thought I needed more...

Regards, Svokke

JOE DIRT® 3rd May 2003 01:59 PM

svokke....a latching relay is a common circuit...there are a number of ways to do it....if you want other ideas also I can point you to some helpful Links

Cheers!!The DIRT®

svokke 3rd May 2003 04:40 PM

Sure I would like view some other ideas. I just ran to the shop to get some latches, but they already closed at 1PM :(
So no testing of above circuit the next few days.

Regards, Svokke

moamps 3rd May 2003 04:58 PM


Originally posted by svokke
:bigeyes: thanks, this looks a nice simple solution :bigeyes:


something more,
If you want that some input is selected always when you power up selector (for example CD input), on appropriate switch connect parallel elco 1uF or 4u7 (+ wire to PS).


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