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4-Bit Decimal Display

4-Bit Decimal Display
Display driver ICs are available in several standard implementations. This circuit makes use of a GAL 22V10 to drive two 7-segment displays without multiplexing. A 4-bit binary code at inputs A/B/C/D is converted to a decimal number. An example of an application is the ‘Audio Limiter (for DVD)’, but take note of the voltage levels! The multiplexers used there are driven by a 4-bit binary counter. This circuit will give a better indication of the behaviour and settings of the limiter.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1-R9 = 820Ohm
C1 = 100nF ceramic
C2 = 2µ F2 63V radial
C3 = 220µ F 25V radial
D1 = 1N4002
IC1 = GAL22V10
IC2 = 78L05
LD1,LD2 = HDN1075
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