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

    Basic Circuit Modification of Kodak Disposable Camera
    Load Cell Amp Schematic
    LED Audio VU Meter Circuit
    D0 Note xxxx
    light activated led scr
    807 Tube Triode Connected
    65W PoE DC-DC converter
    GSM Remote Control MotherBoard Schematic
    FM receivers with PLL