Another realization of Bob Cordell's THD Analyzer - Page 2

giulianodes · 22nd July 2010, 07:28 AM

The input control level box.
After several attempts, I opted for trimmer capacitor to obtain constant amplitude on the entire range.
To next...

Bob Cordell · 3rd August 2010, 12:54 PM

Quote:

Originally Posted by giulianodes

The input control level box.
After several attempts, I opted for trimmer capacitor to obtain constant amplitude on the entire range.
To next...

Nice work!!

I'm sorry I did not catch this thread earlier.

Best regards,
Bob

giulianodes · 3rd August 2010, 01:57 PM

Thanks Bob,
the compliment said by you is worth more.

I take this opportunity to know the reason about this?
Quote:
The circuit does not oscillate in the range of 200 kHz if resistors (E) - (F) connections are Longer Than 2 / 3 inches. It Is Worse even if I use shielded cable.
If Increase the value of C (LN) only (ie 470pF), then the circuit Takes to swing (frequency appropriate to the capacity added) by and bypass cap series resistors.
I do not think the PCB tracks are Longer Than The original circuit wiring.
Which is the reason for that?

Thanks in advance
Giuliano

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3rd August 2010, 01:57 PM	#13
giulianodes diyAudio Member Join Date: Dec 2007	Thanks Bob, the compliment said by you is worth more. I take this opportunity to know the reason about this? Quote: The circuit does not oscillate in the range of 200 kHz if resistors (E) - (F) connections are Longer Than 2 / 3 inches. It Is Worse even if I use shielded cable. If Increase the value of C (LN) only (ie 470pF), then the circuit Takes to swing (frequency appropriate to the capacity added) by and bypass cap series resistors. I do not think the PCB tracks are Longer Than The original circuit wiring. Which is the reason for that? Thanks in advance Giuliano

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