Timer with relay (CB22081E)

We found this circuit in an old documentation. Transistor can be BC548 and relay according to supply voltage and current up to 100 mA.

Crystal Radio (CB14727E)
This circuit is from a 1957 Raytheon transistor manual. The diode can be of general-purpose...
Temperature Compensation using a Diode (CB4142E)
The circuit presented shows how to use a diode in temperature compensation of a push-pull output...
High Stability Regulator (CB14162E)
The circuit shown is from National Semiconductor's Linear Applications Handbook, published in...