Quote:
Originally Posted by Electronpusher0
Hi Andy,
I put the pre-amp on the bench as promised. I attached a modified schematic,
|
Just put the RIAA values (without tolerances) from the schematic into TINA. The response deviates quite a lot (+/-0.8dB), with a big hump at low frequency. From 100Hz to 20kHz it is +/-0.15dB.
However, keeping the 330k fixed, take out the 560p and just use 2.2n. Change the 39k to 48.1k (E192 standard value) and the cap in series with that becomes 5.6n//1n (for 6.6n).
That gives +/-0.13dB from 20Hz to 20kHz assuming perfect values
Craig