This setting for frequencies around 200 Hz was obtained in a 1975 filter manual. PNP transistors can be BC558 and NPN transistors BC548. Signal input and output cables must be shielded.
This setting for frequencies around 200 Hz was obtained in a 1975 filter manual. PNP transistors can be BC558 and NPN transistors BC548. Signal input and output cables must be shielded.