This circuit is from a Ferranti publication of 1968. The circuit generates a signal according to the crystal. The transistor may be a modern equivalent.
This circuit generates interval signals controlled by a light sensor. The basic time of the sound...
This 1968 Mullard circuit detects fire by smoke using LDR-type sensors. The circuit makes use of...
With this circuit it is possible to generate 3-phase rectangular signals from a clock signal. The...