Without regulation, this basic circuit has the output current, and voltage determined by the transformer. The input can be 110 V and 220 V if the transformer used is of the indicated type.
Found in a 90s Popular Electronics, this sensor operates by infrared reflection. The components are...
This simple PWM circuit was found in the March 1991 issue of Radio Electronics magazine. The...
This flasher was found in an old Hands On, but uses common components. The optocoupler can be...