brief sound when switching off amp - Page 2 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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
Reply
 
Thread Tools Search this Thread
Old 3rd August 2012, 01:35 PM   #11
diyAudio Member
 
Join Date: Nov 2011
i measured the red wires 360volts! the etiquette on the transform says red should be 260...

where do those 100volts come from?

for input i choose the blue wire with has to be for 230 input.

the orange are 6.4volts this should of course be 6.3.

link to transformer information

Last edited by mrneedle; 3rd August 2012 at 01:44 PM.
  Reply With Quote
Old 3rd August 2012, 04:32 PM   #12
diyAudio Member
 
Loudthud's Avatar
 
Join Date: Nov 2007
Location: Near Dallas Texas USA
Are you measuring between the two red wires, or measuring each to ground? Measuring them to ground may not give an accurate reading (depending on your meter) becasue of the bridge rectifier.
  Reply With Quote
Old 4th August 2012, 10:54 AM   #13
diyAudio Member
 
Join Date: Nov 2011
Ok i measured again, 283volts. So I now used the brown wire for 240volt input and the. Measured again. It then gave me 261volts. The orange wires only gave 6.1volts.

Then I looked over the layout again. I noticed the gray wire, from 1uf cap to The volume potmeter. It is the ground to the chassis. The input jack is grounded to the chassis, so then I directly solderded a wire from the input ground to the 1uF cap. And the whole thing came to life... Seems the ground to the chassis is not ok. It still has a bit of a 50hz hum but this is ok for now.

Still I wonder, why did I get sound when switching of the amp?
  Reply With Quote
Old 4th August 2012, 07:27 PM   #14
diyAudio Member
 
Loudthud's Avatar
 
Join Date: Nov 2007
Location: Near Dallas Texas USA
The generally accepted tolerance for heater voltage is +/- 10% so you are ok.

Single ended amps always have a little bit of hum. Hard to say why you got sound when the amp was switched off.
  Reply With Quote
Old 4th August 2012, 07:54 PM   #15
diyAudio Member
 
Join Date: Nov 2011
Ok thats good to know but ive spend some more time playing guitar and the hum is to much. And gets louder when turning up the volume?

Ive added a second bridge rectifier for the 6.3 volts orange wires but doesnt change anything..

Also i did get a reply from the website owner provider of the diagram he said i should replace the first 1k resistor with a 3watt resistor, i only had one 5 watt resistor so i added the 1k 5 watt resistor but it stll get to hot to touch!
  Reply With Quote

Reply


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
Fender FM 212 popping sound when switching off nilhegar Instruments and Amps 3 10th January 2012 08:48 AM
Linear or switching power supply in Sound Process steven2583 Power Supplies 12 11th November 2011 10:22 PM
Wanted : UCD /ICE / Zap Amp/ switching amp Modules Magnetar Swap Meet 0 7th February 2006 03:02 AM
Amp Input: XLR & RCA switching Devil_H@ck Digital Source 5 29th May 2004 08:54 PM
The sound of two transistors switching mikelm Solid State 34 12th February 2004 04:18 PM


New To Site? Need Help?

All times are GMT. The time now is 06:30 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2