Positive ground tachometer (CB9352E)

This circuit was found in RCA documentation from the 1960s. The circuit uses components from that time and can measure speeds up to 10,000 rpm.

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Shadow Alarm with Intermittent Sound (CB25483E)
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...
Wien Bridge from 1 to 15 kHz (CB8034E)
Found in a Philips publication from the 1970s, this circuit uses a DO040, which is difficult to obtain...
Nicad Charger (CB4849E)
This simple nicad battery charger uses a current regulator with the LM350. This integrated circuit must be...