作りたいと思ってたGyatone PS-021
コメント欄を見たら、何やら間違いがあるらしひ。
Removal of the electronic switching is wrong. The way it's currently done leaves Q3 emitter to pass DC to LM324 pins 6 and 7. This will stop the signal from flowing correctly through the first opamp stage.
- Remedy: If you build either of the orginal layouts, pull the 47K (R20 in Aion's Schematic) connected to LM324 pin 6. Replace that with a 10K + 220n + 47K in series. 10K to Q3 emitter, cap in the middle and 47K to where it was. The 10K is needed to lower the signal, 220n is decoupling the two stages and 47K is as it was. This will work.
Great circuit and awesome layout Alex. Basically just two labels should probably be swapped (2K2 and B50K) - and 10K + 220n added. The board could also maybe use a series polarity protection and a 1M pulldown for the input.
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