Building a circuit to remotely switch T1 amps on/off - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 18th April 2012, 04:30 PM   #1
diyAudio Member
Join Date: Jan 2012
Default Building a circuit to remotely switch T1 amps on/off

I've build a circuit that takes in an RS-232 signal, and outputs 40ma @ 5vdc (TTL) which I am trying to use to switch on/off 4 amplifiers. I have 4 hifimediy T1's. One is version 1.2 (no switch) and the others are 1.3 (with switch) I am having trouble getting the load side of my device to work reliably. I tried N-channel FETS's first but quickly discovered that all 4 amps have a common ground via the audio input. I can't find a simple P-channel board and I'm not sure the p-channel could handle the wattage. I then tried relays (the same as the Songle relays that are on the amp.) These work at first but the contacts quickly start sticking. I think the 36vdc is just too much for relays. I have read that the T1's with the switch also have the same issue if you use the switch repeatedly. I'm looking for alternatives. I'd like to avoid putting the relays on the audio output because then I would need twice as many relays, 2 per amp rather than 1 per amp.

1.) Do you think it would be work if I connected the relays to the audio input into the amp? Or would this cause sound issues, popping, etc?

2.) Is there another simple method that I may be missing all together?
  Reply With Quote
Old 18th April 2012, 06:40 PM   #2
diyAudio Member
Join Date: Jan 2012
Ordered these: DC60MP - MP Model, 60 VDC, 3 Amp, DC Control Solid State Relay (SSR)
I'll let you know how they work.
  Reply With Quote
Old 20th April 2012, 04:58 AM   #3
diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
Use an optic coupler like NSL32 xx

Gajanan Phadte
  Reply With Quote
Old 20th April 2012, 04:27 PM   #4
diyAudio Member
Join Date: Jan 2012
The opto22 SSR's all have built in optos.
I got everything wired up and 3 out of 4 amps work. The 4th fried the SSR. I noticed that when I measure the resistance across the + and - input terminals, initially there is very little resistance, on the order of 1Ω or so, essentially a closed circuit which would facilitate a tremendous inrush current. The resistance increases to infinite (open circuit) over a couple of seconds. The other three amps don't have this issue so I think there is something wrong with that particular T1 amp, althought it still works and sounds good.
  Reply With Quote


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Remotely Controlled Motorized Volume Pot. fotios Analog Line Level 65 5th June 2013 09:19 AM
amp that allows for remotely located line level controls? thasp Solid State 0 27th December 2010 04:08 AM
building an A/B speaker switch - would appreciate input JMB Multi-Way 6 16th June 2006 11:26 AM
Building a cut off switch. mpm32 Instruments and Amps 1 17th May 2005 01:16 PM

New To Site? Need Help?

All times are GMT. The time now is 03:35 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2