We found this tube receiver in a 1950s Japanese publication. The circuit uses 5 tubes and has an RF amplifier stage for greater sensitivity. The power supply is not shown on the circuit.
This circuit, suggested by Philips Components (1980), uses a fast voltage comparator and requires...
This circuit warns you if you forget to turn off the car light and leave it. The circuit is from a...
This circuit was found in an ancient American documentation. The transformer is the type used in...