andrew2022
New Member
im makin a 4 zone alarm. basically, it uses a 4069 hex inverter to detect open zones, using a 100K res accross an open zone. output goes to a 4401 transistor to light LED. all are connected via a 1n4148 diode to a common terminal, so that all will sound alarm. (no entery time needed). problem is, its not powerful enough to switch a small relay to sound siren. whats the best way to power it?