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 decodes signals received in SSB (Single Side Band) obtaining an audio signal for...
This circuit provides a linear attenuation of a signal up to 100 dB. The circuit operates with...
The 556 integrated circuit is a double 555. The heats of the components depend on the frequency and the...