Main on/off switch for amp using a piezo switch

[gengis]

using_e..........

I wanted to use them as main switches for on/off.

Maxhawk had already done the hard work and it is doing a GP on a board will do just what you want to accomplish. It uses a Bulgin illuminated Ring switch, and far less than the price for the Schurter switch.

Soft switch version 2 anyone?

[using_e]

Ok here are the results:

I put J, K and CLR on high and ........no change....sorry.

I seems that if you don't connect J,K and CLR and leave them floating that they go internally on high somehow. Otherwise it would not function without connecting them.

There is not the slightest change to before.
I will try to experiment a little bit further and also have a look at the mentioned circuit for the soft switch 2. Maybe this can help me to improve my version.

Any further suggestions are welcome.

[using_e]

Ok it's done. I've exchanged the JK FlipFlop in my layout with a D type FlipFlop like Maxhawk uses in his design. Now the switch works like he should. Just don't ask me why.
The only real difference is that the JK is negative edge triggered and the D type is a positive one.

Thanx
using_e

[tedb]

Hi,
We manufacture a ring illuminated Piezo switch with a steady 125mS. The only issue I would see is that you may want to debounce the circuit for anything less. We can also spec a longer pulse if needed. We sell these switches in the states for about $40 USD depending on shape and color... maybe a slight bit more.

We also hold the patent on most of this technology making the other solder their connections to the discs which causes failures down the road.

Hope this helps!

Ted