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DMM range and AC-DC mode, logic control - del20011

Here 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.

PNG-Schematic     PDF-Circuit     DSN-Source
DMM range and AC-DC mode, logic control - del20011
PNG Image Can be Scrolled by Drag-Drop Left-Click-Mouse, PDF Requires Adobe Acrobat Reader Plugin.

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
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