555 Astable internals

259

01:59:05

original circuit by rtarade

https://everycircuit.com/circuit/4717924562239488

repositioned the top resistors and the capacitor and added a led

u still need to have the switch open near the transistor  to start the circuit then close the switch to run the simulation

observations
does not work correctly without the diode over the 1kohm resistor
tried hanging a led off of  notQ but that was not successful the circuit speeds up then stops
 
I tried to create this myself using a utube vid and ended up with something similar https://everycircuit.com/circuit/4800502086500352 but it did not work, 
differences were primarily 
the diode over the 1khom, 
the bottom comparator being inverted .
the flip flop chip  instead of  nor gates

published 4 years ago

Redstone_guy

4 years ago

set all spst switches to the open position or the circuit won't start

Malcolm_McGrath

4 years ago

that's what the 4th paragraph says

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