COPYING_CASSETTE_PROGRAMS

Published:2009/7/14 5:19:00 Author:May | From:SeekIC

Controller serves for making duplicate copies of microprocessor programs recorded on magnetic tape, for insurance against accidental damage to master cassette during use. Used between audio out- put of cassette player and audio input of tape recorder. Opamp IC1 with gain of 100 overloads so output is constant-amplitude square wave regardless of input level from tape being copied. If program uses audio tones for digital data, eight cycles of 2400 Hz represents digital 1 and four cycles of 1200 Hz represents digital O. Additional opamps act as four-pole Butterworth filter rejecting signals above 3000 Hz. 10K pot is adjusted so output level matches requirements of recorder,-P. A. Stark, Copying Computer Cassettes, Kilobaud, Aug. 1978, p 94-96.



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