This simple low current circuit was found in a Radio Electronics magazine from August 1960. The circuit does not use transistors in regulation, but only zeners directly.
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...