The configuration shown was found in an old Poptronics but can be easily assembled using a common calculator photocell. The relay is according to the supply voltage.
This power supply was originally designed to power our next circuit (CB18672E) which consists of a...
This circuit allows the control of a low intensity audio signal from an external logic signal. The...
Found in a 1964 publication, this circuit makes use of transistors from the time. It operates on...