Need yea or nea on input switch - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 8th October 2006, 03:07 AM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Default Need yea or nea on input switch

Any problem with using this switch
for an input selector?

Thanks,
David
__________________
Poor stereo mix? Switch to mono! Perfect.
  Reply With Quote
Old 8th October 2006, 04:32 AM   #2
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
I have used worse...
  Reply With Quote
Old 8th October 2006, 04:39 AM   #3
Leolabs is offline Leolabs  Malaysia
diyAudio Member
 
Leolabs's Avatar
 
Join Date: Dec 2004
Location: Bukit Mertajam
Send a message via MSN to Leolabs
Default Re: Need yea or nea on input switch

Quote:
Originally posted by davidlzimmer
Any problem with using this switch
for an input selector?

Thanks,
David
It's a shorting.Why not go for non-shorting???
  Reply With Quote
Old 8th October 2006, 04:58 AM   #4
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
I think thechnicaly speaking, make before brake is in fact the right option...
  Reply With Quote
Old 8th October 2006, 07:11 AM   #5
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
wait, I'm wrong... too early in the morning it seems.. make before break is for attenuators...
  Reply With Quote
Old 8th October 2006, 07:58 AM   #6
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Quote:
Originally posted by Nordic
I think thechnicaly speaking, make before brake is in fact the right option...
this is true for most audio switching or steeped switches for volume
make before break

Because if is a resistor that keeps down impedance on the other side of switch
this resistor can be important.

The lack of a bias resistor at input terminal, for example
can make amplifier go really crazy,
if so only for a short moment.

Can make blips sounds.
__________________
lineup
  Reply With Quote
Old 8th October 2006, 08:41 AM   #7
v-bro is offline v-bro  Netherlands
diyAudio Member
 
v-bro's Avatar
 
Join Date: May 2006
Ladder type attenuators need break before make (otherwise the resistors can be paralelled for a moment resulting in higher volume (blips) between steps.

Series type attenuators need make before break type switches, otherwise the resistance parallel to the input of the poweramp will be broken off between steps.

Input switches need break before make on the positive wire in order to keep the blips out. The bias resitor should be placed on the output of the switch (input of amp), which is allready the case in most amps...
__________________
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
  Reply With Quote
Old 8th October 2006, 02:02 PM   #8
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Good Morning all. I guess by the sum of the responces, the switch will at least suffice. Any suggestions welcome.

Thanks
__________________
Poor stereo mix? Switch to mono! Perfect.
  Reply With Quote
Old 8th October 2006, 02:09 PM   #9
diyAudio Member
 
Join Date: Jan 2006
Location: Fairmount, GA
Ooops! Now I'm confused. Do I need "make before break" or "break before make"???

The amp is a Peter Daniel LM4780 parallel stereo.


Thanks.
__________________
Poor stereo mix? Switch to mono! Perfect.
  Reply With Quote
Old 8th October 2006, 09:14 PM   #10
v-bro is offline v-bro  Netherlands
diyAudio Member
 
v-bro's Avatar
 
Join Date: May 2006
Break before make, otherwise there's a moment where sources (for example cd-player and tuner) are parallelled inbetween switching.

The only crucial thing is that ground stays connected between source and amp....
__________________
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
  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
Input Switch? markw51 Tubes / Valves 0 23rd December 2006 01:08 PM
Can I switch between two input receivers? riotubes Digital Source 20 23rd August 2005 07:11 PM
input switch for BOSOZ Gabrielshorn Pass Labs 1 19th September 2003 06:57 AM
A good input switch for BOSOZ Gabrielshorn Pass Labs 2 5th September 2003 03:25 AM
Relays as input switch? Nisbeth Solid State 26 28th October 2002 07:12 PM


New To Site? Need Help?

All times are GMT. The time now is 01:42 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