Can you spot the fault?
« on: January 05, 2019, 07:34:26 PM »
Hi guys, this is the second time i am trying to build this mic, and i get mediocre frequency response from the circuit.

Can you spot if there is something wrong with the schematic?

http://www.audioimprov.com/AudioImprov/Mics/Entries/2017/5/7_Schoctava,_a_simple_mic_circuit_files/Mic%20Schoctava%201.jpg


Re: Can you spot the fault?
« Reply #1 on: January 05, 2019, 07:40:50 PM »
And this is the response i get.



Re: Can you spot the fault?
« Reply #2 on: January 05, 2019, 07:52:14 PM »
When i inject signal into q2 i get flat FR.

Re: Can you spot the fault?
« Reply #3 on: January 05, 2019, 08:38:57 PM »
Well i guess i had to learn the lesson eventualy. It was fake chinese FET bought online from "reliable source" on eBay.

Not only was it fake, it had wrong pinout. I just used 2sk170bl and it works like a charm.

Sorry for the confusion...



 

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