Quote:
Originally Posted by edward
I used 470 pf instead of 560 pf the voltage falls about 0.3 volts
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The voltage must be about 0 volt, 0.3 V at the output means that there is at least 1 V of alternating voltage on the collector of TR4, the voltage drop of the diodes must be taken into account. As I said, put C13 / C14 = 220 pF or 100 pF.