Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten counter chips 7490. PARTS LISTR12.2kΩR2142kΩ (120kΩ + 22kΩ)R35kΩ PRESETC10.001µF (102)IC1N
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