RNG project (How to make power dependent on 555 timer switch)

Thread Starter


Joined Dec 9, 2020
The switch on the 555 timer should allow the RNG to count quickly through 1-6 when the switch is connected, and slow down until it lands on a random number when it disconnects. Whenever I try and connect the RNG to power, it continues to roll through numbers without the switch being connected.

I've tried making the output of the timer the source of power for the RNG, but then it keeps rolling even though the switch is disconnected. The output of the 555 timer stays at 5V when the switch is disconnected, so I though I'd add an inverter to make the output 0V, but then the RNG only lands on 1, and nothing else.



Joined Feb 25, 2011
BTW: Just top be pedantic, in case someone else uses this as a basis,

this is not a Random Number Generator,
as it repeats and is predictable,

its a PRNG

Audioguru again

Joined Oct 21, 2019
All of the ICs have no part numbers. Which logic type??
The 5 ohms and 2.5 ohms resistor values in the timer circuit are WAY TOO LOW.

With a supply of 5V, the output high of an old 555 is shown on its datasheet to be only 3.6V, not 5V. Then its voltage might be too low to power logic ICs. Whatever logic type is used might not be able to turn on LEDs.