Vlf converter


Posted on Mar 31, 2013

This converter uses a low-pass filter instead of the usual tuned circuit so the only tuning required is with the receiver. The dual-gate MOSFET and FET used in the mixer and oscillator aren`t critical. Any crystal having a frequency compatible with the receiver tuning range may be used. For example, with a 3500 kHz crystal, 3500 kHz on the receiver dial corresponds to zero kHz; 3600 to 100 kHz; 3700 to 200 kHz, etc


Vlf converter
Click here to download the full size of the above Circuit.

(At 3500 khz on the receiver all one can hear is the converter oscillator, and VLF signals start to come in about 20 kHz higher).




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Ultrasonic Bat reciever
Z80 clock circuit
Complementary lighting control
Flame-ignitor
TDA0161 Metal Detector
interfacing large load bank with
comb filter
4 Tube Superhet
digital step km counter with
Three-State Continuity Tester
LOW COST SOLAR RADIO SPECTROGRAPH
Balanced cross tube inverter circuit



Top