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.
The purpose of this 1965 Radio Electronics circuit is to observe cycloid waveforms on a standard...
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...
This circuit was found in a 1967 Ferranti manual and can be applied to modern operating...