3 transistors metronome (CB7146E)

Found in 1980s documentation, this circuit uses a small transistor radio output transformer and a double potentiometer for frequency adjustment.

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Economic Switched Power Supply (CB16693E)
This circuit is from 1992 documentation. The transistor can be a TIP42 with a good heat sink for...
Music synthesizer (CB10116E)
Found in a 1970s documentation, this mini-organ toy circuit makes use of an integrated circuit from...
Test circuit for transistors as oscillators (CB3915E)
This circuit checks the oscillation capacity of a transistor. The circuit can be used with fixed...