Strobe (T461E)

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

Transformerless Power Supply (CB16592E)
Here is a simple source without a transformer for currents up to 50 mA. The voltage depends on the...
Thermostatic relay (CB21285E)
We found this circuit in an old QST magazine. The circuit is powered according to the thermostatic relay...
Field Strength Meter (CB22329E)
This simple field strength meter is from a transistor book from the 60's. The transistor is made...