DIY speaker selector - diyAudio
Go Back   Home > Forums > Design & Build > Parts

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
Reply
 
Thread Tools Search this Thread
Old 7th December 2002, 07:48 PM   #1
diyAudio Member
 
JAZZ2250's Avatar
 
Join Date: Mar 2002
Location: Seoul. Korea
Default DIY speaker selector

Attached is a diagram of DIY speaker selector that I'm thinking to make before the end of this year. Though only 3 pairs of speakers are drwan in the diagram right now, it will actually be 7 pairs of speakers. So far, it's a simple relay circuit. Any kind of comment would be appreciated. Thanks.
Attached Images
File Type: jpg sel.jpg (79.2 KB, 1129 views)
  Reply With Quote
Old 10th December 2002, 06:41 PM   #2
diyAudio Member
 
JAZZ2250's Avatar
 
Join Date: Mar 2002
Location: Seoul. Korea
Default parts list

The following is parts list:

Relay:
Miniature enclosed power relay. 12 Vdc, 416 Ohm coil. Pc Pins.SPDT contacts rated 12 Amps @ 277 Vac, 16 Amps @ 250 Vac.
Click the image to open in full size.


7 Position Rotary Switch:
Miniature single-pole, 7-position rotary switch with 1/8" diameter x 0.22" long shaft. 0.25" diameter 0.27" long threaded bushing. 0.6" diameter x 0.68" long body. Gold-plated solder terminals.
Click the image to open in full size.

Power supply:
Input: 115 / 230 VacOutputs: 5 Vdc @ 0.7A and 12 Vdc @ 1.3A6.75" x 3.75" x 1.1." 9" wire leads with Molex-type connectors for output. 115/230 V selector slide switch.
Click the image to open in full size.

These are pretty much I can think of now. Please feel free to add comment. Thanks.
  Reply With Quote
Old 25th December 2002, 12:15 AM   #3
diyAudio Member
 
JAZZ2250's Avatar
 
Join Date: Mar 2002
Location: Seoul. Korea
Finished prototype testing, and seems to work fine. A PCB is made for relay board. Time to drill holes on PCB, now. Small modification is a change to 6-chn from 7-chn. So far, so good.
  Reply With Quote
Old 9th January 2003, 01:54 AM   #4
diyAudio Member
 
Join Date: Dec 2002
Location: San Jose, CA
Exclamation SPEAKER SELECTOR CIRCUIT

It looks like your circuit is what's called "break before make". To cut to the chase, using this circuit will blow out your amplifier. Going from seeing infinite impedance to almost nothing will cause a feedback spike that causes the output stage to turn on to damaging levels. Its the same thing as if you shorted the output.

I hope you read this before you try it

-Joe E. Baby
  Reply With Quote
Old 13th April 2003, 03:02 AM   #5
diyAudio Member
 
JAZZ2250's Avatar
 
Join Date: Mar 2002
Location: Seoul. Korea
Well... I haven't noticed that there was a reply. Fortunately, I haven't tried this project. Well... It would be correct to say that I haven't finished the whole project. Everything was assembled on PCBs, but not as a whole.
So, how could I avoid/reduce the feedback spikes? Does this also happen in solid state amplifiers? Could anybody let me know? Thanks.
  Reply With Quote
Old 13th April 2003, 08:10 PM   #6
diyAudio Member
 
Join Date: Dec 2002
Location: San Jose, CA
They make switches that are called make before break, designed especially with your application in mind. You should be able to find some on the web.

-Joe
  Reply With Quote
Old 13th April 2003, 08:23 PM   #7
diyAudio Member
 
megajocke's Avatar
 
Join Date: Jan 2003
You should use flyback diodes or those LEDs will eventually be zapped by the flyback pulse. I don't think break-before-make will be a problem with solid-state amps, but tube amps might not be too happy about an open output.
  Reply With Quote
Old 13th April 2003, 10:57 PM   #8
diyAudio Member
 
Join Date: Dec 2002
Location: San Jose, CA
I've heard of solid-state amps not being very happy about break-before-make, not just with cheap ones either.
  Reply With Quote
Old 14th April 2003, 03:10 PM   #9
diyAudio Member
 
JOE DIRT®'s Avatar
 
Join Date: Apr 2003
Location: Brantford, ON
I think the circuit will work but I think you should make sure the Amp is off when changing between speakers also Diodes across the coils is a definate must.

Cheers!!The DIRT®
  Reply With Quote
Old 14th April 2003, 04:02 PM   #10
Rudy is offline Rudy  Belgium
diyAudio Member
 
Join Date: Feb 2003
Location: Belgium
Default Re: SPEAKER SELECTOR CIRCUIT

Quote:
Originally posted by redrumjoe666
It looks like your circuit is what's called "break before make". To cut to the chase, using this circuit will blow out your amplifier. Going from seeing infinite impedance to almost nothing will cause a feedback spike that causes the output stage to turn on to damaging levels. Its the same thing as if you shorted the output.

I hope you read this before you try it

-Joe E. Baby

isn't this the way all relay based delay circuits in solid state amps work

greetz Rudy
  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
DIY 6-way Speaker Selector - schematic? geetar_king Everything Else 3 2nd April 2009 05:14 AM
Relays to use in speaker selector smithy666 Solid State 5 24th May 2008 05:45 AM
Speaker Selector Box Super Everything Else 1 4th March 2008 03:51 AM
FS: Niles HDS-6L speaker selector w/ speaker protection. Spasticteapot Swap Meet 0 27th May 2006 11:14 PM
speaker selector switch blbarth Multi-Way 4 22nd January 2006 01:07 AM


New To Site? Need Help?

All times are GMT. The time now is 03:08 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