4SUP1_SUP_SUB2_SUB_DIGIT_VOLTOHMMETER

Published:2009/7/15 1:47:00 Author:Jessie | From:SeekIC

National type MM5330 IC provides logic circuits for implementing low-cost 41/2-digit voltohmmeter. Display interface consists of TTL 7-segment decoder driver and four 2N4403 transistors. Operation is based on counting of up to 80,000 clock pulses. Circuit provides sign digit, either plus or minus, and numeral 1 for 10,000 to give full display of ±19,999 with decimal point.- MOS/LSI Databook, National Semiconductor, Santa Clara, CA, 1977, p 5-23-5-29.



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