Intermediate frequency signal generator made by 3L465 ceramic filter

Published:2011/4/24 22:32:00 Author:Ecco | Keyword: Intermediate frequency , signal generator, ceramic filter | From:SeekIC

Figure shows the intermediate frequency signal generator made by 3L465 ceramic filter, the line is simple, easy to start up, the resulting IF signal is stable, it has a good repeatability and outputs audio signal. Working principle: VTl, VT2 and related components form a multivibrator with frequency in 400Hz, it is used to modulate IF signal, audio signal can be output from the A point. VT3, VT4 form an IF signal generator, DL has the selected frequency effect. RP can change the oscillation intensity adjustment. Leading a wire of a few centimeters in B point to output modulated IF signal. Multivibrator can work when getting power if welding is correct. The inspection part of the IF signal generator circuit is correct, it can use a medium-radio to close to the B point leading wire, adjusting the RP make the radio receive the signal, then the adjustment is end. When using, the radio wave band switch should be put at medium wave, the variable capacitor is adjusted to the the low-spin, and then point B closing to the AM ferrite antenna coil lead wire, and then one by one repeatedly adjusting the frequency transformer make the speaker's voice or added to voltage be the maximum.



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