Headphone Switch?

a 3W single ended EL84 amp for home, work & school

Headphone Switch?

Postby opa1 » Thu Dec 10, 2015 5:41 pm

Can a dual throw switch be used to cut off speakers when the headphones are used? Will it hurt the OPT's? What is the best way to splice it into the circuit?
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Re: Headphone Switch?

Postby Geek » Fri Dec 11, 2015 3:37 am

If solid state, yes. If tube, no. It would need to switch-in a dummy load for the amplifier.

Also, you'll want to add a ressitor in series with the headphones whose value depends on the power of the amp and impedance of the phones.

-= Gregg =-
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Re: Headphone Switch?

Postby soundbrigade » Sat Dec 12, 2015 4:48 am

I and others have had endless arguments with a guy who insists of running his high-Z headphones directly on the speaker OPS of a Musical Angel (EL34 or KT88 - don't remember) and he has suffered from some problems. When pointing out that his stubborness will eventually cause his amp to break, he ignores our warnings (stop) . But, well that's another story. :/

Howevere I ran into an interesting design in the Austrian or Australian (???) amp I am building:

IMG_6871.jpg (77.2 KiB) Viewed 2620 times

The componentsin red had to be added to have the automatic switching working correctly.

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