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Old 21st June 2004, 08:14 PM   #1
Clarkcr is offline Clarkcr  United States
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Default Building a phase inverter to convert stereo to mono

Can anyone help me with a circuit for inverting the phaze on a two channel stereo amp and thereby turning it into a sigle channel mono amplifier?

The Audio Control Richter Scale has this feature, but it only does it for one amp....basically for turing a stereo amp into a single channel sub amp.

Van Alstine sells this unit, but it's $300 for the kit, and I'd like to do this myself with my own chassis and effort.


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Old 21st June 2004, 08:26 PM   #2
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But what I would do is probably just use a DRV134 chip straight up.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell
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Old 21st June 2004, 09:14 PM   #3
anatech is offline anatech  Canada
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Default another chip

Or use SSM2142P.
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Old 22nd June 2004, 08:28 PM   #4
EUVL is offline EUVL  Europe
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Default Linsley Hood Phase Splitter

Try this :
(see last Figure in the article)

Very simple, works great. Negligible noise (I used MPSA18 as Q1 but BC550C would also be fine), but make sure you have input caps on the power amp inputs.

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