Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Leach Amp tactile power-on switch
Leach Amp tactile power-on switch
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 25th August 2007, 01:06 AM   #1
adrianbodor is offline adrianbodor  Romania
diyAudio Member
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

  Reply With Quote
Old 25th August 2007, 01:29 AM   #2
jaycee is offline jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
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.
  Reply With Quote
Old 25th August 2007, 11:21 AM   #3
jan.didden is offline jan.didden  Europe
diyAudio Member
jan.didden's Avatar
Join Date: May 2002
Location: The great city of Turnhout, BE
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
Music is dither to the brain; lets me think below the usual chaos - me
Get more Linear Audio for less! Check out my Autoranger and SilentSwitcher
  Reply With Quote
Old 25th August 2007, 12:16 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
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.
  Reply With Quote
Old 27th August 2007, 06:52 PM   #5
adrianbodor is offline adrianbodor  Romania
diyAudio Member
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

Click the image to open in full size.
  Reply With Quote


Leach Amp tactile power-on switchHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Worthwhile to make my own tactile transducer amplifier? Muftobration Class D 4 12th June 2009 09:53 PM
tactile transducer BASS SHAKER GUS Subwoofers 3 24th March 2004 01:10 PM
Tactile Transducers seangoesbonk Parts 2 3rd July 2002 01:13 AM
Using a momentary switch for main power switch? FullThrottleRic Parts 9 25th June 2002 09:23 PM
Building tactile transducer from scratch lpoht Subwoofers 0 7th March 2002 05:10 AM

New To Site? Need Help?

All times are GMT. The time now is 11:35 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio