TRIGGERED_SWEEP

Published:2009/7/10 22:24:00 Author:May | From:SeekIC

Developed for use with general-purpose CR0 in troubleshooting digital circuits, to provide one horizontal sweep of cathoderay beam each time circuit is triggered by input signal pulse. Noninverting input of 741 opamp is connected to vertical amplifier of CRO,and inverting input is used to control trigger level. When input signal rises above trigger level, output of opamp swings to -V and makes output of 555 timer go high, allowing output capacitor to charge at constant cuirent through transistor in series with resistor. Resultis nearly perfect ramp voltage. All diodes are 1N914. an is any PNP switching transiston-W. J. Prudhomme, Trigger Your Oscilloscope, Kilobaud, Aug. 1977, p 34-38.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/TRIGGERED_SWEEP.html

Print this Page | Comments | Reading(3)