This circuit of a 1969 Electronic Design uses RTL logic. The setting can be adapted to TTL. The frequency is given by the crystal.
This circuit was found in a Ferranti documentation from 1969. The transistors are common types of...
The basic idea of this circuit is to indicate the tolerance of a capacitor by reference to a...
This 80's circuit turns off a TV or other appliance after a set time. The base is a 555 IC and the...