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

Equipment & Tools From test equipment to hand tools

Remote controlled A/B sound test switch for amps, speakers and sources like CD, DACs
Remote controlled A/B sound test switch for amps, speakers and sources like CD, DACs
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 13th February 2020, 01:42 AM   #1
Turbowatch2 is offline Turbowatch2  Germany
diyAudio Member
 
Join Date: Aug 2013
Location: Northern germany
Default Remote controlled A/B sound test switch for amps, speakers and sources like CD, DACs

I have build my self a new remote controlled test switch for A/B comparison of amps and sources.

I had such a switch for many years, to do tests while modifying all kind of audio gear. I dislike just doing modifications and have no way to make (more or less) objective listening tests.
So I put one reverence or un-modified part on one side and the "tuned" one on the other. Then I switch between them without any delay and listen.
If you have to change wires, this is not as effective as just turn a switch to really do A/B testing.

Because today many amps are bridged, I decided to build a new switch unit, also more comfortable and universal than the old one, that used a wired remote switch.

One side switches two amps to one pair of speakers or with one amp between two sets of speakers.
Because relay contacts wear out when switched under load, they are doubled. Not elegant, but a good way to keep resistance down.

The other side can be used to compare sources like CD players or DACīs, or just to match levels while comparing A/B on the other side.

On the RCA side the ground is switched with the signal to prevent ground noise from different sources.

By using cheap offers from eBay and AliExpress I was able to realize this for roughly 30 US$.

Parts are:

Remote control 12V
4-way relay board
8-way relay board
6 double speaker binding posts
6 RCA sockets
1.5 A voltage regulator
some wires
a used case


I will just post pictures from single parts to finished unit. If you work very pedantic, like me, be prepared to spent a whole day on it. All these wires are really time consuming.

PS still have to add some LED to show the state of the switchers.
Attached Images
File Type: jpg Parts.JPG (381.9 KB, 51 views)
File Type: jpg Power_Side.JPG (493.1 KB, 51 views)
File Type: jpg Line_Side.JPG (457.9 KB, 51 views)
File Type: jpg Inside.JPG (531.2 KB, 51 views)
File Type: jpg outside1.JPG (230.5 KB, 67 views)
File Type: jpg outside2.JPG (292.3 KB, 27 views)

Last edited by Turbowatch2; 13th February 2020 at 07:12 PM.
  Reply With Quote
Old 13th February 2020, 02:27 PM   #2
chermann is online now chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
Cooooool!!!!
  Reply With Quote
Old 13th February 2020, 05:27 PM   #3
Sound41 is offline Sound41
diyAudio Member
 
Join Date: May 2012
Nice execution. I'm interested in building something similar. My modified usage is for switching 2-4 vintage receivers to a set of speakers for A/B/C/D type source evaluation and general listening across my different receivers (Marantz, Sansui, Yamaha etc...), turntables and reel to reels.
  Reply With Quote
Old 13th February 2020, 07:10 PM   #4
Turbowatch2 is offline Turbowatch2  Germany
diyAudio Member
 
Join Date: Aug 2013
Location: Northern germany
While such a switch box is still a lot of wires to connect do these Chinese relay modules make things a lot easier.
You only supply 12 Volt to them and switch the relays by applying ground in simple mode.

If you use something like an Arduino for switching, they are 5 volt TTL compatible by setting a jumper.
  Reply With Quote
Old 13th February 2020, 07:18 PM   #5
Turbowatch2 is offline Turbowatch2  Germany
diyAudio Member
 
Join Date: Aug 2013
Location: Northern germany
For me one very interesting use is to plug in a CD player on one end and a separate DAC, connected to the same players digital out.

Be aware! Can be a very bad eye opener, if you switch during a song.
Very important is to match levels very exactly if you do such testing.
A CD with a 1000Hz sine tone and a voltmeter at the output will get you straight.
  Reply With Quote

Reply


Remote controlled A/B sound test switch for amps, speakers and sources like CD, DACsHide 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
Moving Sale - Speakers, Electronics, Amps, DACs and More!!! opc Swap Meet 62 11th January 2016 05:00 PM
News. Powerful current sources controlled PCM1794A. FEDOSOFF Digital Line Level 7 4th May 2014 08:14 AM
How to switch 2 Sources and 2 Amps steph99de Analog Line Level 0 16th March 2014 10:22 PM
Fitting an IR controlled switch for power amps Kwikas Solid State 3 19th March 2011 05:27 AM
remote controlled line level switch brainsalad Solid State 1 18th November 2006 03:34 PM


New To Site? Need Help?

All times are GMT. The time now is 02:35 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki