Suggested by an American publication of 1964 this circuit is intended for the capture of signals from film tracks recorded by optical systems, common at the time.
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...