Superregenerative stage adjusted with R11 and C10. When superregenerative stage is working properly you hear specific noise in the speaker. Frequency of the stage (IF) set up with help of C11. After that do tuning L12C15 to maxima sensitivity of the receiver.

Audio Amplifier made from good parts according to the schematic works straight away. Almost any low power, low noise (better high- gain) transistors work well at the receiver. Transformer TP3 was used from an old transistor radio. Was used a 16 Ohms Speaker from an old transistor radio. It is possible (ever better) switch on a high- impedance head phone instead the TP3.

Parts List

Resistors:

R1: 1 k

R2 100 k

R3: 15 k

R4: 10 k

R5: 100 k

R6: 120 Ohm

R7: 1.2 k

R8: 8.2 k

R9: 5.1 k

R10: 10 k

R11: 100 k , potentiometer

R12: 8.2 k

R10: 10 k

R11: 100 k , potentiometer

R12: 8.2 k

K = multiply to 1000 Ohm

All resistors 0.125 W

Capacitors:

C1: Variable, air dielectric, 10- 100 pF

C2: Variable, air dielectric, 2- 15 pF

C3: 22 pF

C4: 560 pF

C5: 0.05 uF

C6: 6800 pF

C7: 3300 pF

C8: 3300 pF

http://www.antentop.org/

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