Need Transformer

[J D Redneck]

I am in need of a replacement transformer & don't seem to be able to find one.
Can someone point me at a supplier or maybe suggest an alternative part that I could use....

 

[MaxHeadRoom78]

What is the voltage used on the board, it looks like a simple unregulated supply, the voltage on the relay may give you the indication, look up Hammond and other transformers at DigiKey etc.
Probably a 12v or 24v dc relay.
For a regulated supply you would need a 9vac secondary for 12vdc or a 17v-18vac for 24v, if just providing power for the relay, it is not critical.
Max.

 

[MaxHeadRoom78]

I see now the output is 10v, You should be able to get a close match at DigiKey et al.
You may have to tailor the board a little if you can't get the same footprint.
Max.

 

[J D Redneck]

Thanx 4 the reply....

No 5A 250v~T85
892-1AC-C
12VDC
No 5A 277VAC
No 7A 125VAC
S170807

 

[Nigel Goodwin]

I would imagine a 10V transformer is pretty rare?, but a 9V one is a standard voltage, and will be perfectly fine.

As already suggested, you may need to alter the board if you can't find one with the same pinout.

 

[J D Redneck]

Thnx 4 the help...
My knowledge is limited as I need to study more, but this field is a hobby that interest me...
I can generally fix something that is obvious, but am learning how to diagnose componants...
I don't have the skills to substitute as yet, so I rely on finding an exact replacement...
I will get better....
If I find something that I think will work, I will post it & hopefully you can tell me if I am right...
I have found some 10v secondarys but nothing with 100mA, I am not sure if I need to go to 90mA or 125mA...

 

[Nigel Goodwin]

Thnx 4 the help...
My knowledge is limited as I need to study more, but this field is a hobby that interest me...
I can generally fix something that is obvious, but am learning how to diagnose componants...
I don't have the skills to substitute as yet, so I rely on finding an exact replacement...
I will get better....
If I find something that I think will work, I will post it & hopefully you can tell me if I am right...
I have found some 10v secondarys but nothing with 100mA, I am not sure if I need to go to 90mA or 125mA...

125mA would be better.

All the transformer is doing is providing the 12V DC for the relay coil, using a simple bridge rectifier and single reservoir capacitor, the switch is between transformer secondary and bridge rectifier.

I would suggest 9V is probably better than 10V, as it will probably give closer to 12V than a 10V transformer would.

If you can find a 9V that fits the board, then go for that - otherwise you may as well go for 10V if you've got to modify the board in either case. It might be easier to fit a chassis mount transformer, and run wires from it's terminals to the PCB - bolt the chassis mount transformer to the top of the PCB, preferably with plastic bolts. Less messing about than bodging the board to make another PCB mount one fit.

 

[MaxHeadRoom78]

Are you in N.A. ?
If so Home depot have some stand-alone versions that you could adapt in a pinch if need be.
They have one with 9v secondary.
Transformers secondaries are not that accurate, it all depends on the supply voltage at the time.
Max.