Superregenerator

380

05:05:24

The classic self-quenching oscillator which can be used as a super regenerative detector in a simple RF receiver. In this case the RF signal is applied to the LC tank. The detected signal is taken from the parallel RC tank in the emitter circuit (an LPF must be added to filter out the quenching freguency).

In a practical circuit the 2 nF capacitor should be replaced with a larger one, in order to decrease the quenching frequency to 30-50 kHz, and the oscillator feedback should be tuned to be just above the generation threshold. The 10 Ohm resistor in the LC tank models the loss in the coil and does not need to be added in practice.

published 11 years ago

trimooon

11 years ago

Nice!

stanislav_maslovski

11 years ago

Thanks!

luisgomes

11 years ago

Muito bom parabems

luisgomes

11 years ago

Coloque mais!

luisgomes

11 years ago

Qual é a função do choque no emissor?

luisgomes

11 years ago

E como se calcula os 30-50 kHz?

stanislav_maslovski

11 years ago

Hi Luis, the inductor is needed to prevent the RF signal at the emitter to be shunted by the RC tank, which has low impedance for the RF signal. The quenching frequency is determined by the time constant of the RC tank. As a rough approximation you can use this formula: f = 1/(0.5 R*C).

lelox93

10 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.