Audible Voltmeter (CB21395E)

This circuit was found in an American publication from 1969. Transistors are from the time and can be replaced by modern equivalents.

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Motor Driver (CB12765E)
With this step the motor is energized when the TTL or CMOS input is high. Motors up to 1 amp and...
Single Power Supply Function Generator (CB6360E)
We found this circuit in a Texas Instruments documentation from the 80s. The circuit uses simple...
Current Voltage Converter MC34071 (CB14484E)
Equivalent operational amplifiers can be used in this circuit suggested by Motorola in its 1990...