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 was found in the February 1980 issue of Radio Electronics magazine. The digital...
Found in a Popular Electronics from the 90s, this circuit is intended to measure the harmonic...
This circuit that simulates the sound of a drum is part of an article published in the Radio...