Hello,
fo a log time I was thinking how to bias a potential LR phono amplifier. Steve proposed to use LED bias with a small portion of low frequency feedback. As proposed in the D3a line stage I tried to simulate the szenario with separate cathode feddback windings (CFB). LTSpice yielded goog results but I had to use the CFB of the second stage with inverted polarity and honestly I do not understand why - but it works.
Unfortunately I cannot find an option to attach the LTSpice file.
LR Phono with cathode feedback winding
Moderator: sbench
LR Phono with cathode feedback winding
- Attachments
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- RIAA_D3a_SB_CFB.asc
- (4.95 KiB) Downloaded 735 times
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- d3a_TF.inc
- (573 Bytes) Downloaded 797 times