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DMM range and AC-DC mode, logic control - del20011Here the U1D and U1B 4093 acts like a de-bouncing circuit for the push keys. The 4029 counts up scrolling to binary values 00, 01, 10, 11 for the four ranges.The binary value of 4029 is decoded to decimal by 4028 in order to light four LEDs which indicates the range or mode on the front panel. When any of these pushbuttons are pressed and held, the nand schmitt 4093 clocks to scroll the range continuously. The binary output of these counters control CMOS switches 4052 which are analog multiplexers. To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with Mouse and PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
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| DMM range and AC-DC mode, logic control - del20011 |
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Data sheets and info useful to study and build this circuit. The 1-to-2 Line Decoder/Demultiplexer Digital Counters 16 Stage Bi-Directional LED Sequencer The educational encyclopedia, course material: digital logic STMicroelectronics - Logic ICs Counting Circuits Sam Electronic Circuits - Datasheets Pulse Width Modulator, with the MC14093 Schmitt Trigger NAND |