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120_kHz_TO_4_MHz

2015-03-21 15:17  
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120_kHz_TO_4_MHz
Square-wave output of about 3.5 V can be obtained with SN7400 quad NAND gate, quartz crystal of desired frequency, and single resistor. One of unused gates may be used to gate generator output. Insertion of crystal in socket shocks crystal into oscillation at its resonant frequency, for generating square-wave output over most of frequency range. Waveform approaches clipped sine wave near 4 MHz. Output is suitable for triggering SN7490 decade counters reliably, with normal fan-out.-E. G. Olson, 2 Gates Make Quartz Oscillator, EDN Magazine, May 5, 1973, p 74.