|Chip Amps Amplifiers based on integrated circuits|
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|12th November 2004, 05:08 PM||#1|
Join Date: Oct 2004
What type of toggle switch when driving with batteries?
I'm in the process of designing a 3-channel LM4782 gainclone.
I'm going to power it with two 12-volt batteries connected in series.
Ground will be taken off the junction between the two batteries.
Now I'm trying to decide what kind of On/Off toggle switch for the front faceplate.
With a simple "single-pole" I could open and close the ground connection.
But, this would mean that the rails would still be in constant battery connection.
What would this do to the chip?
With a "double-pole" I could open and close the rails.
"Triple-pole" would open and close all three.
The real reason I'm asking this is that I also want to run an active cooling fan off of the same switch because I want to force the fan to be on when the amp is on.
Componding the issue is that the fan will have a high speed or low speed.
Now, this means the switch now has to become "double throw" with the fan occupying one of the available "poles" (giving a worst case total of 4 poles).
Up - amp On, fan on High.
Center - everything Off.
Down-amp On, fan on Low.
So, I know that "double throw" is needed.
But, I'm trying to determine if I can do "double pole" or "triple pole" rather than "quad pole".
I hope I've explained clearly...
I'm kind of new at this...
Thank you for any assistance.
|12th November 2004, 08:37 PM||#2|
Join Date: Jan 2003
I implemented a battery powered GC with a double pole, double throw switch.
And, do you really need a fan?
I never have any heat issues, with a reasonable size heat sink.
|15th November 2004, 06:53 AM||#3|
Join Date: Aug 2002
If you use a DPDT switch on the +/- rails, you may have to try several switches. The first one I used closed the two contacts at slightly different times resulting in a loud pop at the speakers. The next switch I tried was silent.
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