The FSK modulation circuit composed of 74LS74

Posted on Feb 5, 2014

This is the FSK modulation circuit composed of 74LS74. The FSK modulation circuit has neither PLL nor bandpass filter with high Q value, so there is no need of any tune adjustment in the high-frequency modulation circuit. The 2 tune circuits composed of L1, L2, C4 and C7 is working as the input filter, which only allows the frequency band with cen

The FSK modulation circuit composed of 74LS74
Click here to download the full size of the above Circuit.

tral frequency of 10MHZ to pass, and the high frequency difference amplifier A3 can amplify the 10MHZ signal. The auto gain control (AGC) circuit is composed of A1 and A2. The HF signal, which is magnified by A3, can be switched into digital signal by comparator A4.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Continuity Tester
    Frequency Generator Counter
    Michael J. Rainey: July 2011
    audio Smallest circuit to make a sound
    microcontroller PIR sensor triggered by itself when using timer works without timer
    seven segment display used in automatic
    GBPPR 1 GHz RF Spectrum Analyzer
    Buck power conversion by the MAX639 + 5V fixed output
    INA321 OPA340 composed output buffer circuit 322