Simple Counter

238

04:31:07

Simple circuit that counts from 0 to 59 then starts over.

published 6 years ago

hurz

6 years ago

resistors for LEDs R=(Usupply - Uled)/Iled=(5V - 2V)/0.02A=150Ω, no problem @robbi_kiddi i do for you, next one is yours again.

Crypto_

6 years ago

Hi @hurz, the LEDs are just there to highlight the binary value of the number on the display. I chose 100Ω arbitrarily just so they would not burn. Of course in real life I would discourage using a value as low as 100Ω for a supply of 5V, but since it's just a simulation, it works fine.

hurz

6 years ago

irl its another question i would use much higher resistor values, maybe i do an extra thread for this issue. Most CMOS logic ICs are not able to drive a 20mA LED and anyway its not needed cuz todays LEDs are so bright its even annoying to drive them with max power. In a real circuit 1kOhm will work perfectly, while here in sim i prefer most cases where i use resistor 20mA. If its only for signaling here in simulation i use them without resistors and set the voltage identical or little below the logic supply voltage, this saves worksheet space!

hurz

6 years ago

this way http://everycircuit.com/circuit/6089516943933440

Crypto_

6 years ago

Good tip

lenzrulz

6 years ago

Check out this similar idea: http://everycircuit.com/circuit/5867714830925824

Crypto_

6 years ago

Nice one @lenzrulz. I was just a bit confused by the order the lamps were in at first though. I assumed the least significant bit would be at the right like I'm used to.

lenzrulz

6 years ago

Thanks Crypto, the objective was to present a neat schematic layout while retaining simplicity and functionality.

kiani

6 years ago

Objective is wrong way arround.

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