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FSK_GENERATOR_FOR_CASSETTE_DATA

2016-10-16 17:27  
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FSK_GENERATOR_FOR_CASSETTE_DATA
Uses two 565 PLL ICs, locked to 800-Hz system clock but oscillating at 6.4 kHz and 4.8 kHz, to provide FSK signals for recording digital data on ordinary cassette tape. Harmonic suppression of square-wave output is taken care of automatically by high-frequency roll off characteristic of tape recorder. Incoming data determines which oscillator feeds its signal to recorder.- Signetics Analog Data Manual, Signetics, Sunnyvale, CA, 1977, p 859-860.