Am 28.02.2023 um 14:41 schrieb Max Sailor:
Versuche es einmal mit einem 100 uF/16V Elektrolytkondensator mit + an der Basis von Q1 und an Masse.-
Aber warte 'mal ab, was die anderen Leute hier schreiben ...
Grüße
Google translate givers
It uses two halves of an LM358. the first as a gain-of-two amplifier, the second as comparator. It's not an elegant circuit.
Nothing comes to mind immediately. A big capacitor - 100uF electrolytic from the base of Q1 to ground might slow it down enough to kill the initial spike.
R9 is 10k so 100uF is a 1sec time constant. The capacitor will never see more than 0.6V, so it doesn't need much of a voltage rating - 6.3V would be an overkill, but Farnell lists 537 of them, so you'd have a lot of choice,
Try a 100uF/16V electrolytic capacitor with + on the base of Q1 and to ground.-
But wait and see what other people write here...
Drat. I didn't see that before I posted my own suggestion. 16V is an even more popular rating, but the capacitor will be bulkier.
After I'd slept on the problem, I realised that C2 on the circuit diagram is creating the problem. When power is first switched on, C2 initially holds the threshold low - at the ground voltage. If C2 was hooked between the threshold voltage and Vcc, the threshold voltage would start high and decline to the target value.
No trigger at turn-on.
<snip>
Einface C2 entfernen.
piglet
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