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Digital Millivolt Meter DIY Production Kit AD Conversion Welding Parts Electrical and Electronic Skills Teaching Training -77062
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This circuit can convert the input analog voltage into a 3-digit half 8421BCD code and display the value through 4 digital tubes.
Introduction to working principle
MC14433 is a dual-integration A/D converter that converts the input analog voltage into a 3-bit half 8421BCD code.
Reference power supply MC1403, providing precision voltage, making reference voltage of A/D converter
Seven-segment decoder CD4511 converts 8421BCD code into seven-segment drive signal
Display drivers V1 - V4, driving the common end of the three-and-a-half digit digital display.
Three-and-a-half-digit display, digitally display the seven-segment signal of the output of the decoder, and read out the A/D conversion result. The three digits refer to the ones, the ten digits, and the hundred digits range from 0-9. The half digits refer to the thousands digits which can only be 0 or 1. They cannot be changed from 0 to 9. So they are called half digits.
On Nov 22, 2023 at 02:29:16 PST, seller added the following information: