CMOS Siren (CB26157E)

Found in the 1991 Electronics Experimenter Handbook magazine, this circuit has good power and is recommended to be triggered by light.

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Control switch (CB9264E)
Found in a 1969 EDN, this circuit uses components from that time. Modern equivalent transistors can be...
OC71 and OC72 amplifier (CB18853E)
This amplifier with old germanium transistors is from a 1957 documentation. The power is a few...
Universal Filter (CB14922E)
We found this circuit in an American documentation from the 90s. The circuit combines functions of 4...