Strobe (T461E)

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

Signal Injector (CB14464E)
This traditional configuration of astable was found in a 1965 documentation. Transistors can be...
Fixed Frequency VFO and Variable Cyclic Ratio 555 (CB17247E)
This variable frequency oscillator generates signals that have a recurrence frequency determined by...
Function Generator (CB18889E)
This is an old circuit, using operating equipment of the time, modern operational amplifiers can...