This circuit uses an unusual component today which is the integrated circuit. We found this configuration in Motorola's 1990 Linear Databook.
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
In this circuit, the relay remains closed by activating a lamp, for a time that depends on the...
The frequency depends on C, which must have the indicated value ratio, and also on R, which can be...