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PostPosted: 26 May 2014, 13:26 

Joined: 03 Feb 2014, 18:31
Posts: 12
Location: Ohio, USA
Ya know all those fancy audio boxes where if you plug-in headphones to the front jack it turns off the rear outputs to your speakers? I would like to know how they do that.

My main goal is to use one op-amp to pre-amp a signal, and send that signal to RCA outputs or a front headphone output, but have only one be active at time without using a hard switch. What do I do? wiring diagrams or any help would be very appreciated!

PostPosted: 26 May 2014, 13:56 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC

They do that with switching in the jack.

BUT.... a far better way to do it is use a seperate heavy duty switch for speakers on/off, just like vintage SS amps because the switches in the jack are usually crummy quality and fail due to oxidization in a few years (unless you use a $50 gold jack).


-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
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PostPosted: 27 Oct 2014, 11:45 

Joined: 26 Oct 2012, 21:00
Posts: 203
Location: ontario canada
not quite clear on the objective as rca level and headphones are two different signal levels.
could you outline the need for the switching function?

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