need some help guys

Just measuring the voltage across the output of the switch darlingtons in the on and off state (or the voltage across the relay) should tell you a lot about whether the switching is working at all. I wouldn't change the relay supply until I proved that it is really necessary and you don't have some other problem.

on,

collector/emitter.

I agree wholeheartedly. There most certainly is some other problem there. I didn't mean to imply that the low supply voltage could cause this problem. The OP's measurements across the Darlingtons shows that either the connections are wrong or the Darlingtons are blown.

... Johnny

ok will do some testing tonight steven

turn

there. I

problem.

Good one Steven, I didn't want you to (incorrectly) think that increasing the 18V power supply would cure your problem. Chances are that you have a few problems in this circuit that will need correcting. I wish I could help you more - I remember what it's like to be starting out and trying to understand this stuff. On the positive side, although this is probably getting you down a bit, I'm sure that you've learned heaps in the process. That's what's important. Overall, though, your problems appear relatively simple. I wish I was there with my DMM to help solve this more quickly. I'd say that a few quick measurements would sort things out. Where are you, by the way? I'm in Nowra, NSW, Australia. I assume that you're a long way from here. After you do your tests, post the results and maybe one of us can help further. ... Johnny

hey i found what was wrong the darlingtons whear in backwards the e was at the b ::-0 that fixed the relays now they turn on like they should... EAGLE had the wrong pin out on the darlingtons.. i am in the U.S state P.A now just have to get the freq counter to work. but now i can use it..

thanks for the help Steven

It just shows that you should look over the datasheets to see it the pins are right ?????????

steven

Well done - I knew it had to be something like that. And yes, it's always a good idea to check the datasheets when you strike a problem. The frequency counter might be trickier. I'll take a look and see if I can think of anything.

... Johnny

ok and this is true "On the positive side, although this is probably getting you down a bit, I'm sure that you've learned heaps in the process. That's what's important." i did simple stuff at first and have learned a lot more as i move on up... when i can't get help i try to use google as much as i can and it has helped out alot.

steven

You mean GooTube?

yea gives you 1,000,000+ things that you don't whant on just one thing......

steven