Most proper way to switch inputs? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 12th August 2007, 08:11 AM   #1
diyAudio Member
Join Date: Jul 2005
Default Most proper way to switch inputs?


What is the most proper way to switch inputs keeping the best signal integrity and preventing leakage from one input to another?

- short unused inputs to ground (will this damage any source?)
- disconnect both signal and ground from unused input (this seems the best solution to me)
- leave ground on all inputs connected, switch signal only (probably will have leakage)
- leave ground on all inputs connected but 10 ohm resistor from each to ground, switch signal only

appreciate any comments!
  Reply With Quote
Old 12th August 2007, 08:22 AM   #2
diyAudio Member
Jan Dupont's Avatar
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
I would say (as your self) that suggestion 2 is the best
Free Schematic and Service Manual downloads, Spare time company (just for fun):
  Reply With Quote
Old 12th August 2007, 08:41 AM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
I think the leakage you refer to (crosstalk) is mostly due to capacitance between the lines/switches.
Using a double pole relay with large gap across the open contacts to each input AND a double throw to connect both these to a separate ground could reduce the capacitance to adjacent inputs.
I would keep the used input ground as a dedicated wanted signal ground. The grounded inputs and returns could all be shorted to a common unused signal ground that separately goes to the main audio ground.

This may be an over the top solution, because most competently designed line inputs can achieve >=-80db separation without this complexity.

You will need to check each source to find if it is suitable for muting by grounding/shorting the signal line.
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 12th August 2007, 10:39 AM   #4
Nordic is offline Nordic  South Africa
diyAudio Member
Nordic's Avatar
Join Date: Sep 2005
Some advice is to have your switch close to the inputs, and use a long shaft from the knob, or use relays.. also keepinging input cables minimal lenght, and well seperated...
  Reply With Quote


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
switch between two amp-inputs, multiple channels gazzary Everything Else 3 3rd October 2007 01:38 PM
FET inputs or bipolar inputs on a power amp? ash_dac Solid State 150 17th October 2006 06:27 AM

New To Site? Need Help?

All times are GMT. The time now is 10:40 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2