Different Crystal Radio (CB933E)

This different configuration for a crystal galena radio or modernized since a diode is used, has a similar performance to the versions that connect the diode in the traditional way. Note that diode and capacitor swapped positions. The diode should be germanium and magnetic headset high impedance. There is the alternative of using a piezoelectric capsule in parallel with a resistor of 10 k to 100k Ω. The antenna must be long and the coil consists of 100 turns of 28 AWG wire in the form of 2 cm to 2.5 cm coreless diameter (broom handle or PVC pipe). The variable can be a 365 pF type and can be obtained from an old AM radio tube. The antenna should be long and the ground connection is important to get the maximum output.




Circuit Bench