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

More about LDR attenuators
More about LDR attenuators
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Old 6th September 2010, 12:02 PM   #1
jotape is offline jotape  Europe
diyAudio Member
Join Date: Mar 2006
Location: Catalunya
Default More about LDR attenuators

Hope this design can be useful to someone.

It's an analog "quasi constant" input impedance attenuator, with adjustable output impedance.

This design requires some degree of matching L & R LDRs to avoid unbalances, and lesser matching with control net LDRs (to achieve desired impedances).

With 18 NSL-32SR2 on hand, I've build it (in fact, now it's my favourite volume's att.).
Works pretty well: Not too much unbalance, acceptable attenuation law & impedances.

Using same idea, a "quasi constant" output impedance (volume level independent) can be made.
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