Momentary switch to switch relays

[fordgtlover]

Hi to you all.

I'm brand new here. I've come looking for some assistance on a project that I am trying to build.

I have built an audio A-B box. It simply uses two 12v non latching **broken link removed** to switch between two different audio sources and out through a headphone socket for the purpose of comparing audio equipment, rather than a source selector.

My original built used an push-on push-off switch, but it is quite loud when it click. This alerst the listener to the fact that the source has been swapped. I woudl liek to change the exsiting switch to a silent switch.

After doing a fair bit of looking I have decided that I would like to use a momentary switch - one click for on and another for off. I found a flip flop circuit on the web (link), but after building it and it not working I found that many otehs have had problems with it.

My question for you all is whether someone has a circuit that would suit my needs.

The only other circuit I have found that looks interesting is the 'doing it discretely' circuit at http://www.cpemma.co.uk/flipflop.html

Any thoughts.

 

[ljcox]

Here is a relay Flip Flop that I posted for someone else.

Let me know if you can't obtain a push button with a SPDT contact and I'll show you how to do it with a SPST button.

 

[ljcox]

Here is the SPST Option

 

[Boncuk]

Hi fordgtlover,

if you desire absolute silence for switching your might select a CMOS device (CD4066), an electronic switch with four units in one package. If you are just switching the input signals there should be any problem. The 4066 has an on-resistance of approx. 80 Ohms, but there is another type (forgot the type number) with lower on-resistance in the market.

Using a low noise tactile switch there is almost no noise involved switching sources.

Boncuk

 

[fordgtlover]

Thnaks to all. I ended up using the doing it discretely flip-flop as linked above. It's a bit large on perfboard, but it works well.

Cheers