P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The frequency is given by C1 which can have a modern standard value such as 3.3 uF or even 4.7 uF.
In the circuit in the figure, we have the production of rectangular signals with frequencies of up...
Found in an EEE this circuit uses FETs of the time and a bipolar one. Current equivalent...
We found this circuit in a 1968 Hughes publication. The components are from the era and can be...