Hi,
I'm using a strong bar magnet the size of those white plastic boxes with small magnet inside for the reed switch. First I need to explain, we leave the security gate open during the day, and have a piezo buzzer 555 system with magnetic reed switch to trigger it, to alert us when the gate is opened or closed... and it works beautifully; but the gods do not favour us, every 1 to 2 hours or so we get a false positive, and it can't be the magnet, it's way above specs, and when it was still in breadboard form we wrote off the false positives as bad connection on the trigger capacitor, but now (buzzer7.mees.intuitief) I put it on vero (strip) board, so it can't be a bad connection on the vero board side, and it can't be a bad magnetic connection, so why do the gods not favour us with false positives? Any ideas?
PS buzzer7.pdf is the scematic for this project (my first)
I'm using a strong bar magnet the size of those white plastic boxes with small magnet inside for the reed switch. First I need to explain, we leave the security gate open during the day, and have a piezo buzzer 555 system with magnetic reed switch to trigger it, to alert us when the gate is opened or closed... and it works beautifully; but the gods do not favour us, every 1 to 2 hours or so we get a false positive, and it can't be the magnet, it's way above specs, and when it was still in breadboard form we wrote off the false positives as bad connection on the trigger capacitor, but now (buzzer7.mees.intuitief) I put it on vero (strip) board, so it can't be a bad connection on the vero board side, and it can't be a bad magnetic connection, so why do the gods not favour us with false positives? Any ideas?
PS buzzer7.pdf is the scematic for this project (my first)
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