Need help with a circuit. - Electronic Circuits Projects Diagrams Free

Aidis · 31st January 2005, 10:32 PM

http://www.epanorama.net/circuits/parallel_output.html
(Were it sais , new safer design for the relay)

This is the circuit i need to make , am i doing ok in the attatched image?
Thanks!

Russlk · 1st February 2005, 02:43 AM

As far as I can tell, it looks OK. I don't know what the relay is, so can't tell if it is wired correctly, and can't tell if the transistor is wired correctly. It would be a good idea to put a diode across the motor to protect the relay contacts.

Aidis · 4th February 2005, 02:20 PM

The wiring seems correct but eveytime i activate the circuit , and the relay opens (I can hear the sound of it clicking) there is no power output from the relay. I found that if i connect the motor to the external power ( + ) spike and the spike that goes to the rest of the circuit (On the relay) i can control the motor as i need to but for some reason either the voltage or the amperage is terribly wrong. It reads like 2 volts with a voltometer ... wtf..? The relay coil code is MF843-1C-12DS.

Sebi · 4th February 2005, 02:32 PM

I mean, the relay pinout wrong.

Roff · 4th February 2005, 02:35 PM

Quote:

Originally Posted by Aidis

The wiring seems correct but eveytime i activate the circuit , and the relay opens (I can hear the sound of it clicking) there is no power output from the relay. I found that if i connect the motor to the external power ( + ) spike and the spike that goes to the rest of the circuit (On the relay) i can control the motor as i need to but for some reason either the voltage or the amperage is terribly wrong. It reads like 2 volts with a voltometer ... wtf..? The relay coil code is MF843-1C-12DS.

A Google search for the relay found nothing. Where did you get that part number? Can you post a link to a datasheet?
Note that BC547A and 2N2222 have different pin configurations (collector and emitter are swapped).
It is generally bad practice to insert semiconductor (transistor, diode) leads into plastic foam (if that's what I'm seeing in your picture). Static electricity can destroy the devices.

Aidis · 4th February 2005, 03:23 PM

I bought it from a local electronics store heh. No no the foam is just for the picture , i have a circuit board now. Hmm ill try and experiment with it a bit ...

Aidis · 4th February 2005, 03:27 PM

The guy had told me its like this:

(Edited and made the diagram an image)

The only way this works though is if i connect both the circuit and the motor to 1 and 3. He told me to connect to 5 and 4.

Aidis · 4th February 2005, 03:30 PM

That didnt come out very good .. anyway. Do you think i should get a new relay? If yes , what code for a good 9V one.

Russlk · 4th February 2005, 05:13 PM

Judging from your sketch and the picture, I believe you have it connected correctly. Try measuring the voltage across the 9 volt battery, the relay, and the motor. That should tell where the problem is.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

1st February 2005, 02:43 AM	(permalink)
Russlk	As far as I can tell, it looks OK. I don't know what the relay is, so can't tell if it is wired correctly, and can't tell if the transistor is wired correctly. It would be a good idea to put a diode across the motor to protect the relay contacts. __________________ see my website: www.geocities.com/russlk

4th February 2005, 02:20 PM	(permalink)
Aidis	The wiring seems correct but eveytime i activate the circuit , and the relay opens (I can hear the sound of it clicking) there is no power output from the relay. I found that if i connect the motor to the external power ( + ) spike and the spike that goes to the rest of the circuit (On the relay) i can control the motor as i need to but for some reason either the voltage or the amperage is terribly wrong. It reads like 2 volts with a voltometer ... wtf..? The relay coil code is MF843-1C-12DS.

4th February 2005, 02:32 PM	(permalink)
Sebi	I mean, the relay pinout wrong.

4th February 2005, 03:23 PM	(permalink)
Aidis	I bought it from a local electronics store heh. No no the foam is just for the picture , i have a circuit board now. Hmm ill try and experiment with it a bit ...

4th February 2005, 03:30 PM	(permalink)
Aidis	That didnt come out very good .. anyway. Do you think i should get a new relay? If yes , what code for a good 9V one.

4th February 2005, 05:13 PM	(permalink)
Russlk	Judging from your sketch and the picture, I believe you have it connected correctly. Try measuring the voltage across the 9 volt battery, the relay, and the motor. That should tell where the problem is. __________________ see my website: www.geocities.com/russlk