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Posted: 06 Jan 2018, 02:34 

You see in this image a block marked FL301. This is the band-pass filter that splits the audio FM into left & right channels for demodulation. Just before this, at the output of Q303, looks to be where you should be picking off the AFM signal for your AC-3 output. I suspect the big circled dot on the trace from Q303 to FL301 marks a test point where you can very easily attach.

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Posted: 06 Jan 2018, 04:27 

If you haven't already recap the LV-20 board!

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Posted: 22 Apr 2020, 19:21 

I guess I should have listed all the parts. These are the two transistors I used.

NTE123AP for Q1
DTA124ES for Q2


Image


Hope this helps
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