SubscribeThree digit counter electronic project
This electronic project is a simple three digit counter schematic diagram ,that use few electronic components .
This three digit counter electronic project use the 14553 IC , which is a 3-digit BCD (binary coded decimal) counter. Inside the 14553 IC, each counter drives a 4-bit latch which quad 3- input multiplexer. The 14553 IC has Carry, Reset, an input clock and Latch Enable pins. The 1nF mylar capacitor on pins 3 and 4 sets the multiplex scan rate to about 1 kHz.
The four outputs (Q0 to Q3) are fed into the 14511 cmos 7-segment decoder driver. The outputs of this driver then go to the 3-digit multiplexed display unit. Each digit is turned on at the correct time via the display control outputs at pins 2, 1 and 25 of the 14553. They are active low outputs. Each drives a BC557 pnp transistor via a 4k7 resistor. The transistors in turn switch the common cathode of the digits in the display.
Two or three circuits may be connected together to make 6 or 9 digit counter modules .
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