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

Forum Problems If there is a forum related problem please leave a message here so an Admin will see it.

Speaker relay - transistor, cap question
Speaker relay - transistor, cap question
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 24th January 2010, 07:54 PM   #1
mjz3348 is offline mjz3348  United States
diyAudio Member
Join Date: Jan 2010
Location: Houston
Default Speaker relay - transistor, cap question

Amateur question.

I have a Kenwood KR-7600 Receiver. After two years in storage, I powered it up. Worked great for a few days and then the speaker relay will start to cut in and out intermittently. It's most notable when the receiver is warmed up - and then it sort of goes away after an hour run time - although it will still happen. The speaker relay will click - no sound - and then a few seconds later, the relay will click shut again and music resumes.

I checked the circuit driving the DC protection and saw no unusual voltage - although it will jump 200 mv every time the relay opens and shuts. The relay acts first and then I see the voltage change. It seems the amp is fine - but the speaker protection circuit has problems.

There is a transistor which drives the relay. I suspect it's getting bad as well as the electrolytic cap(s).

My question is since the problem is intermittent - is it most likely a transistor problem? If a cap failed - wouldn't the relay just stay open and not go intermittent?
  Reply With Quote


Speaker relay - transistor, cap questionHide 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
muting transistor>relay,can i do this? Rodzilla Analogue Source 2 18th December 2016 08:40 AM
Humming Speaker Protection relay when powering up (newbie question) slowpoke-nl Solid State 4 21st November 2007 02:32 PM
Quick relay/transistor question Prune Parts 5 9th August 2004 03:54 PM
input cap or output relay... ABO Solid State 29 24th June 2004 09:59 PM
Transistor relay circuit more_power Solid State 12 21st May 2002 02:37 AM

New To Site? Need Help?

All times are GMT. The time now is 12:02 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio