Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
have tried it again, but no luck. relay is clicking, but not much and doesnt change over. got meter out and between gnd and 4069 output there is 12.89VDC. but, accross the relay there is only 4.5VDC. output of the transistor is only 4.5 VDC aswell. any ideas for the low voltage?
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...
yup. small world
i was looking for something more simpler that doesnt involve PICs. basically just something what will sound a buzzer if the inut goes high with less than a 5sec would be enough
all its to do is warn me when the batteries are going low. since i get a few hours, i dont want...
thanx for the replies people. the best way around it i have found atm is to put the comp in standby, switch on monitor then switch comp on. only takes a few seconds to standby and startup
my ups beeps every 10 seconds when its runnin from battery. which is very annoyin. it then beeps every second once the battery starts to go low and its about to shut down. what i need is some sort of circuit that will sound a buzzer when it beeps every second, and for it to do nothing when it...
i have a trust UPS800 which i have modified (i.e added 200AH worth of batteries to the 7AH it came with and added a few cooling fans. i have also fed it thru a 2NO+2NC contactor so i can switch off the UPS and run direct from mains. the UPS is rated 480W output and the computer (comp, 1 monitor...
this is more electrical than electronics, but im sure someone will know how to do this. there is a lift in a 3-floor building. it is controled by a switch outside only. no switches inside the lift. what i need is a way to stop the motor when its level with the floor. i know how i can start/stop...
i have a dimmer light what is permantly on, no matter what the dimmer is set to. i have taken it apart and there is a small circuit inside. could it be the triac (btb04) causing the problem?
you should get a proper RCD tester to make sure it is functioning properly. does the test button make it trip? could you get a hold of another RCD to swap them and try that? you say you do it regularly and it works. what do you mean by works?
also, can i ask why your bypassing the neutral on...
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