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Safety cutoff circuit troubles
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Pentoad:
I am designing a system where a relay is turned off for some time when a voltage is present at the input pin. When the voltage is present, C1 is discharged and the relay switches off as it's meant to. The only issue I'm struggling with is when the circuit is powered up for the first time, I have to wait about a minute for the capacitor to charge and the relay to switch on. How would I change the circuit so that C1 is charged once when the circuit is powered meaning that I don't have to wait for it to switch on?
MiDi:
As a starting point:
There are a couple of issues with this, can you figure out which?
Any ideas to fix the issues?
mk_:
--- Quote from: Pentoad on December 26, 2019, 02:52:43 pm ---How would I change the circuit so that....
--- End quote ---
at least polarity of Q2 is not how it should be...
Pentoad:
Easyeda seems to always give me upside down transistors and I forgot to flip it.
--- Quote from: MiDi on December 26, 2019, 09:13:35 pm ---As a starting point:
(Attachment Link)
There are a couple of issues with this, can you figure out which?
Any ideas to fix the issues?
--- End quote ---
I can't help you without a description of your problem.
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