Leach Amp tactile power-on switch - diyAudio
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Old 25th August 2007, 12:06 AM   #1
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Join Date: Jul 2004
Location: Romania
Default Leach Amp tactile power-on switch

Hy, I have seen an idea on this site, a push button which can be useful to power-up the entire amplifier, but because it cannot be connected directly to mains, he needs a relay to be "isolated"

Anyone knows a circuit that could do this, maybe a 555? i intend to use the exact push button from that site, it looks good.

How can i add a red LED to be lit when amp is off and blue when is on

Any idea, pls share it and if u know another resource on the net let me know, i'm sure many wants a circuit like this

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Old 25th August 2007, 12:29 AM   #2
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Join Date: Apr 2004
Sounds like you want something like this:


You would need to change R1 and the touch pad for the switch but that's not too hard to do. You'd want a capacitor over the switch to prevent switch bounce from rapidly toggling the circuit.
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Old 25th August 2007, 10:21 AM   #3
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One thing to remember is that you need some power to the switch circuit even when the main amp power is off - generally that means a separate 'always on' small power supply. Or a rechargable battery.

Jan Didden
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Old 25th August 2007, 11:16 AM   #4
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
the push to make switch operates a latched relay.
The latch consists of a capacitor, 4 resistors, a FET or BJT, and a relay.
Damned if I can find the circuit to post here.
But I'll keep looking.

A LED+R across the relay will come on when the relay is pulled in.
A LED+R across transistor will stay on when the relay switcher is off.

That separate supply that Janneman mentioned can also supply the other relays that control soft start, delay on, instant off, DC detect, DC servo, etc.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 27th August 2007, 05:52 PM   #5
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Join Date: Jul 2004
Location: Romania
I want to use for this project this circuit with a 555 timer, but i never worked with relays before
This circuit have LED indicators for on/off state

I studied relays a bit and for this circuit i need a relay to switch AC mains to my amp, a double pole relay for neutral and live wires

It is ok if i use 12 V coil and 10A AC rated contacts?
because my amp draw from mains no more then 6 amp

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