Old Crown PZM schematics?

[Scodiddly]

I may be building a couple replacement "transformers" for a pair of older Crown PZMs... usual story, the PZMs were saved but not the accessories, and Crown told the owner they'd happily recycle the remaining parts into scrap metal.

I recall some discussion somewhere where one person was going to build some replacements... was that over on TapeOp (currently defunct forums)? Anyway, searches here didn't turn up the necessary info. I figure at worst I can use the basic electret circuitry, which some web pages suggest.

 

[clintrubber]

Don't know what exactly the missing sections are. I only am vaguely familiar with RShack-incarnations of the PZMs, so FWIW, could this be of use ?

ESP active PZM circuitry

Bye,

Peter

 

[rodabod]

There are quite a few PZM schematics available.

There is one to (maybe) avoid which has bad CMRR - you can tell because of the transistor pair before the output.

I'm often quite surprised by what you can achieve with these mics for the price.

 

[Bo Hansen]

Scodiddly,

If you have the old Crown PZM 30 series, you can find some connecting and powering info here:
http://www.crownaudio.com/pdf/mics/k80351a6.pdf

I have also some PZM history reading on my "microphone tech" page:
http://web.telia.com/~u31617585/

--Bo