Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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.

Advice on bypass/AB/Y selector?
Advice on bypass/AB/Y selector?
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 8th January 2008, 05:22 PM   #1
HailToTheThief is offline HailToTheThief  United States
diyAudio Member
Join Date: Jan 2008
Default Advice on bypass/AB/Y selector?


That is the link for an AB/Y selector i TRIED to build. The idea is that the input can be sent to either A or B or A and B. I followed the instructions, but I was unsure about which side of the switch is which. They were DPDT switches. I built the one of the top without LED's. I configured it so that if the switches were see-through, then the top left connector in the diagram would have been the top left if the button on the switch was facing up and all the connectors facing down. Maybe this is wrong, maybe there is a certain way to read these things. This is my third project with soldering that i have done and it is the first that failed so im pretty sure this will be simple stuff for most of you. Also, if you have any good links to a forum that tells how to read those schematics with the electrician style symbols of everything cause i found a few plans with that layout but had no idea how to read it. sorry if this post is a little long but hopefully someone can help me out. thanks.
  Reply With Quote
Old 8th January 2008, 06:24 PM   #2
Bobken is offline Bobken  United Kingdom
diyAudio Member
Join Date: Dec 2002
Location: UK

I am not 100% sure of the question here from your description, and haven't read what kind of switches are intended here, but maybe the following might help.

The diagrams look as if they are the contacts on double pole double-throw (or changeover) switches, most likely toggle switches. Each side is independent, and that is why on the leftmost switch (A/B changeover), there is a separate external connection added between the top L contact and the lower R contact, and the same between the top R and the bottom L.

With such toggle switches, when you move the lever downwards, it will internally connect the middle and TOP tags on both sides of the switch, and when the lever is in the upper position, the BOTTOM and middle tags are internally connected. I know that this may not be intuitive, but with every similar switch I have ever seen (hundreds) this is the way they work, and is a result of their construction. Although both sides of each switch will changeover at the same time, there is still no internal connection from one side of the same switch to another.

What may help is if you separately draw out the routing of the connections with the switches in each position, based on what I have said above. i.e. draw the first rough sketch as if the lever is upwards on the first switch (or with the internal connections on both sides being made between the middle tags and the lower tags) and then do the same with the lever in the opposite way, and hopefully then you will see how the *external* circuit connections are changed over.

I hope this helps.

  Reply With Quote


Advice on bypass/AB/Y selector?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need advice on capacitors for power supply bypass (Hafler P-500) Aaron D Solid State 8 13th February 2017 12:30 AM
Bypass caps values advice AndrewGM Solid State 2 27th May 2009 09:48 PM
can I bypass my receiver's input selector and still use volume pot? bonjonno Solid State 9 20th February 2008 02:55 AM
Reversing speaker selector switch. Need advice. maurycy Multi-Way 4 21st January 2008 02:31 PM
Poster in Musical Instrument forum needs bridging advice on BrianGT 4780 advice moving_electron Chip Amps 0 16th February 2005 12:37 AM

New To Site? Need Help?

All times are GMT. The time now is 05:05 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio