Posted on Feb 6, 2014

Diode, D13, provides different timings for the forward sweep, and the retrace which can be faster than the forward sweep. Outputs are generated to tell the blanking circuit when to blank the CRT and when to unblank the CRT. The sync trigger input provides pulses that synchronize the start of the sweep to the voltage level selected by the user. The

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

sync trigger input constantly retriggers a 74123 retriggerable one-shot so that pin 4 of U9 is always high. If synchronized trigger is not selected because the value of the input signal never reaches the selected sync level, then the retriggerable one-shot will time out allowing the sweep generator to free-run. A truth table for the 7476 is vital for analyzing this circuit and is given in the table below.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Automatic Charger for Battery Hi-Fi Preamps
    LCD Caller ID with AT89C2051
    2 Watt VHF linear amplifier
    Second-Order Polynomial Generator Circuit
    ultrasonic sensor interfacing with 8051
    Anatek Lab Supply
    egan fet silicon power shoot out volume 10 high frequency resonant converters
    telephone sharer circuit 9
    Many simple door buzzer sound circuits
    AVC Automatic Volume Control Circuit
    Trimless IF VCO: Part 2: New ICs Simplify Implementation
    Cyclotron II
    Walkman splice power production circuit
    ICL7107 chip digital circuit section 2