Turnstile Audio TAC700 schematic

[DFischer]

I've previously posted a schematic on the Turnstile Audio TAC1100 mic in THIS thread. Out of curiosity, I also bought a pair of Turnstile TAC700 mics and decided to do the same. Being a cheap transformerless mic, I was expecting it might use a Schoeps circuit, but it appears to be an impedance balanced output instead. Here's what I have so far. Any comments are welcome. I'm learning a lot by doing this, and hopefully the schematics are useful to somebody.

 

[DFischer]

A couple of questions:

1. The circuit looks flat to my inexperienced eyes. Am I correct?
2. I tried to figure out what kind of oscillator was used so that I could draw Q1 more accurately. The two inductors made me think it might be a Hartley oscillator, but that doesn't seem to fit. I noticed it was almost identical to the one used in Studio Projects C1. However, the output to the voltage quadrupler is taken at a different node. Would this still be correct? What is this oscillator circuit called?

C1 Oscillator


TAC700 oscillator???

 

[Khron]

The circuit looks flat to my inexperienced eyes. Am I correct?

If by "flat" you mean "with no high-frequency attenuation", then yeah, it's flat.

I'm still not 1000000% convinced about the accuracy of that schematic, though...

 

[micolas]

@DFischer
Check carefully if you have drawn the diagram correctly.

 

[DFischer]

@DFischer
Check carefully if you have drawn the diagram correctly.

Will do, thanks!

 

[micolas]

@DFischer
About DC/DC converter:
You can collect and rectify/multiply the high frequency voltage produced by the oscillator, either against GND or against U+.