I am trying to simulate a flow meter, it’s output is 3v every 3 seconds it alternates between 3v and 0 v continuous. I have basic circuit knowledge, and can create simple pcn circuits. I don’t want to us IC 555 timers ect if can be helped

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  • \$\begingroup\$ Easiest would be to use a microcontroller. Do you have some experience with Atmega controllers, like the ones used on the Arduino? \$\endgroup\$ – jusaca Mar 26 at 7:20
  • \$\begingroup\$ I have a basic understanding but I’m not confident \$\endgroup\$ – Mark Makepeace Mar 26 at 7:32
  • \$\begingroup\$ If you really insists on no ICs: look up "bistable transistor circuit" switch to images. \$\endgroup\$ – Oldfart Mar 26 at 7:46
  • \$\begingroup\$ Would anyone on here be happy to build me a circuit which I could buy from you? \$\endgroup\$ – Mark Makepeace Mar 26 at 9:07
  • \$\begingroup\$ Why not a 555? What would you prefer to use instead? The period is 3 seconds, but what is the pulse width? How accurate does the period and pulse width have to be? Can it be trimmed before use with a pot? What temperature range do you expect? 1) For low accuracy I might use a 74AC14 (relaxation oscillator + differentiator for the pulse). 2) For medium accuracy I might use a 555. 3) For high accuracy I would use a MSP430G2553 microcontroller. For 1 & 2, if I already had a microcontroller in the project, I would use it for the timer as well. \$\endgroup\$ – Mattman944 yesterday

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