problem with shift registers

Thread Starter

super7800

Joined Apr 3, 2019
42


@bertus i didnt even know that a calculator like that existed. many thanks that will definitely come in handy. also thanks for the values.

I decided to go with 30hz for now, might change it back in the future. the above circuit works great, when the button is pressed the output lamp pulses 4 times, whilst the 555 timer continues to generate a clock that i will use elsewhere. so i have two questions regarding this circuit. #1 is does anyone see any major problems or ways that i could improve it? to me it almost seems to complex for such a simple problem. #2 is why does the circuit only work when i have the LED attached? I've tried pulling the output both high and low with different resistance values which failed the simulation, however when i added the led everything worked great. thanks.
 
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