E)
We found this circuit in a PE Hobbyst Handbook from the 90s. The components are common, except the Geiger tube. The transformer is also a component that requires care when choosing.
The circuit, shown in the figure, consists of an audio oscillator that generates signals between...
This circuit was found in a 1992 PE Hobbyst. The circuit detects the presence of spy...
This circuit produces low power flashes in a LED. Frequency is adjusted by P1 and depends also on...