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DISCRETE BCD Counter

Here I made a digital counter using discrete transistors.

discrete-electronics-guyDiscrete Electronics Guy
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  • Discussion 3
  • Hackaday Prize 2019
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  • discrete-electronics-guyDiscrete Electronics Guy

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  • Blog (about BCD counter)
  • Blog, ( about T f-f)
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2019hackadayprize digital counter bcd counter discrete counter counter using transistors 4 bit counter digital up counter counter design

This project is submitted for

  • Hackaday Prize 2019

This project was created on 05/25/2019 and last updated 5 years ago.

Description

Here I made a digital counter using discrete transistors. Also use some resistors, capacitors, etc... The counter is an interesting machine which count numbers. Here it is a 4 BIT binary counter. So it count from 0000 binary number to 1111 binary number. In decimal it is from 0 to 15. After this I convert it into a BCD counter. The BCD counter is a counter which count upto 1001(9 decimal). So it reset to 0000 after counting 1001 number. For this function, I add some combination circuit to it. OK.For more details about this counter theory visit my BLOG : https://0creativeengineering0.blogspot.com/2019/03/4-bit-counter-using-discrete-transistor.htmlHere I made this circuit by using T flip-flops. IFor more details about T flip-flop please visit my Blog which is about it.

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Discrete Electronics Guy wrote 05/25/2019 at 08:57 • point

No... that is because. When connecting leds to the Q', the voltages at its collector is drops which due to the small collector current design. I design  collector current keeps low as possible to decrease the whole circuit current consumption.

  Are you sure? yes | no

Ken Yap wrote 05/25/2019 at 09:22 • point

You are going to consume current when the LED is on anyway, so that makes no difference. The change just makes the Q' do double duty. In fact you should parallel the LED and current limiting resistor with the same resistor as the Q transistor so that the Q' collector is pulled to high level. The difference when on due to the LED current is only around 0.1V. And what's a few mA for what is a pedagogical circuit.

  Are you sure? yes | no

Ken Yap wrote 05/25/2019 at 08:52 • point

You could have saved a few transistors by using the Q' transistors to sink the LED indicators' current.

  Are you sure? yes | no

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