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 is from a technical manual of the 80's. The operational ones are of the time like the...
The circuit that we give below has two possible applications: it can be used to control a lamp...
We found this circuit in a 1996 publication. Equivalent components can be tried, especially in the...