Constant current source (CB8822E)

This 2mA source was found in a 1968’s Philips documentation. The transistor may be the BC549.

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Call indicator (CB7235E)
We found this circuit in an old neon lamp application manual. The circuit stores a call. The...
Audio Interface with Optocoupler (CB25495E)
This isolation circuit for audio signals was found in the August 1992 issue of Radio Electronics...
Fuzz 4 (CB4874E)
This fuzz uses only one transistor that can be the BC548. Signal input and output cables must be...