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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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Old 14th May 2013, 11:15 AM   #31
Mooly is offline Mooly  United Kingdom
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Originally Posted by godfrey View Post
Yes. An LDR (light dependent resistor) would be better for fading.
That's a good idea.

I remember in Elektor (probably 25 years ? ago) a circuit to blend L and R channels on an FM tuner to reduce hiss and it used opto coupled FET's (8 pin DIL I think). I've never seen any such devices (that I can remember) since.
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Old 14th May 2013, 11:43 AM   #32
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o,my mistake!
But ,use LDR for fading?It is unimaginable for me,if it is must to dimming a lamp?
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Old 14th May 2013, 11:56 AM   #33
Mooly is offline Mooly  United Kingdom
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This will give you an idea for LDR's
Lightspeed Attenuator a new passive preamp

(Muting is easy with transistors, fading is not)
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Old 29th May 2013, 10:13 AM   #34
ODougbo is offline ODougbo  United States
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A little off topic - but never saw this before: Audioplex Technology 72W Stereo-to-Mono Mixer | MONOMIXER 200 | Audioplex Technology
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Old 29th May 2013, 10:31 AM   #35
DF96 is offline DF96  England
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That will be a hybrid - used for many years in old analogue telephones, and related to directional couplers used in radio.
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Old 21st August 2013, 01:55 PM   #36
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Sorry to revive this old 3ad, but we (a non profit organization) need a fully-passive "mixer" that does an L+R and can manage both balanced and unbalanced audio.

Something like the Australian Monitor's "Mixed Up" (that is quite expansive, check it out: but with just 2 XLR-combos as inputs and a balanced/jack as out.

It would be great to have an opensource/DIY project for this kind of tool.

Thanks in advice.

Last edited by; 21st August 2013 at 01:58 PM.
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