StayatHomeElectronics
- Joined Sep 25, 2008
- 1,073
The relay turns off when the output of the 4060B (the base of the PNP transistor) is at 12V.
It sounds like the relay is now doing what it was designed to do. Does the collector voltage go to zero (relative to GND) after 15 minutes? If so, it is working correctly. If you have a double-throw relay (SPDT or DPDT), use the other set of contacts.Hi all, I swapped e anc c. Now the coil has 12 volts when circuit is turned in and the output from the relay is zero volts. I believe I had e and c correct previously. After the 15 minutes, the pin on the 4060B goes high and the relay turns off and the relay output is 12.24 volts. This is exactly what I want but in reverse
Any other ideas?
Thanks
Dave
When you say Ron, I assume you mean the guy that designed the circuit. My name is also Ron.The c (previously e) goes to zero after the 15 minutes when pin 13 on the 4060B goes high. The R56 is a SPDT. I don't understand why when c and e were the other way around it did not work at all. Now it works but backwards. I know the other diagram used an npn. maybe Ron got it backwards. Should I get an npn? If so, which way to connect? What to base and what to e and what to c?
Thanks
Dave
Your NPN connection is incorrect. As I said, look at Ron's circuit number 1. See below.Hi, I changed it to an NPN. Put e to Vin, C to pin 2 of relay (coil) and b to the 780 ohm resistor. Now the relay output is 12.24 volts when circuit is turned on and after 15 minutes the relay output is zero. Just the way I wanted. Thanks for your help. I believe Ron J should have used a pnp on circuit 1 and npn on circuit 2. However I have 1 additional issue. After a few minutes of relay output off (past the 15 minutes) the output becomes 12.24 volts again. Even though the 12 volts are still on the coil. I think I may have damaged it some or the current comming through the NPN is not enough to keep it clamped. The R56 -5.5-12 has only 1 coil and 1 contact so I am not sure what you mean by other contact.
Thanks Ron
Dave
I'm not sure what you have until you answer my questions:Hi Ron, circuit 1 has e connected to ground I am not switching ground. I am switching 12 V. Should I have C connected to 12V, e connected to coil and b connected to the resistor from 4060b?
I looked at the description a little more. Maybe I bought the wrong relay. This relay has the output on unless power is supplied to the coil. Ron J's description says the transistor should turn off and then relay goes off cutting the output.
Thanks again.
I see, pin 7 is normally open. So use the PNP with e to Vin, and c to pin 2 (coil) and out put to pin 7?
Thanks again.
Dave
Does it have the pinout shown below?Is it an NTE R56-5D.5-12?
No, that's not right.Yes, that pin out. Currently I have the NPN with c connected to pin 2. Vin connected to pin 1 and ouput connected to pin 14. If using PNP, then should I connect e to Vin, c to pin 2, b to resistor R7 , and Vin to pin 7 on the R56?
Thanks Ron
by Duane Benson
by Jake Hertz
by Duane Benson