000-999 DECIMAL COUNTER

309

03:28:04

- UP / DOWN COUNT SWITCH 
- RESET SWITCH
- PAUSE SWITCH

* 2 NAND logic gates (clock / oscillator)
* 1 Capacitor + 1 Resistor for clock speed 
   [Current settings: 100nF + 1KΩ =±3.5 kHz]
* 7 AND-logic gates to skip HEX 0A-0F
  & to make 'up' pulse [ten / hundred digits]
* 2 NPN Transistors for boost 'up' pulse
* Slow simulation (many nodes) ¯\_(ツ)_/¯

Thanks for watching

published 7 years ago

lenzrulz

7 years ago

Check out this similar idea: http://everycircuit.com/circuit/6213004940279808

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