Beacon with instrument (CB20495E)

This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by solar panel from 1 V.

11 to 32 V x 700 mA power suppply (CB8500E)
Found in na 1969 Electronics World, this circuit makes use of transistors of the time. Equivalent...
Variable Frequency Reject Filter II (CB19693E)
This circuit is from 80s documentation and makes use of common operational amplifiers. The...
1 Transistor Stage Decoupled by Feedback (CB12206E)
With this type of circuit, it is possible to obtain high input impedances and, at the same time,...