Strobe (T461E)

Found in Popular Electronics from August 1968, this circuit makes use of a strobe tube from the time.

1 MHz Low-Pass Filter (CB15638E)
Signals below 1 MHz pass through this circuit, which is based on a high frequency operational...
Active Filter Photo Detector (CB14697E)
This circuit selects a signal at a frequency determined by the double T. The NPN transistors can...
Nano Ammeter (CB14956E)
The accuracy of this circuit depends on the resistors connected to the band selection network. The...