This sonic control circuit for a small robot turtle was obtained in an American documentation from 1967. The circuit uses a ceramic capsule to fire an SCR.
This two-stage amplifier hás a high impedance input and excelent voltage gain. It can be used as a...
An interesting circuit suggested to indicate when a device is turned off. In the figure we have...
This simple circuit indicates the logic level of a TTL output. The resistors can be 1k and the...