Hey guy,

I have this audio gate/expander that I want to change its voltage to 220v. There is a rail in PSU for the 220v (please see phot) my question is that if I make the jumper on that rail would it be all set for 220v ? Whiteout the magic smoke

 

Yes, if you also remove the 110V link - do not fit BOTH links as that will guarantee magic smoke.

 

Yes, if you also remove the 110V link - do not fit BOTH links as that will guarantee magic smoke.

I did that already but the fuse on my power cord blew when I connect it ! So I solder it back to its original place.

 

Thank god for fuses...

 

hi Tech,
Photo shopped your images.
E

 

Thank Eric you’re legend

 

hi T,
I see only one MOV component, it may only be rated for 110V use, so don't connect it across the 220Vac until you are sure.!
Note also the transformer primary wire colours on the schematic and actual PCB.

E

 

hi T,
I see only one MOV component, it may only be rated for 110V use, so don't connect it across the 220Vac until you are sure.!
Note also the transformer primary wire colours on the schematic and actual PCB.

E

I believe you’re absolutely right, I would just leave it as it is and use external transformer.

 

I see only one MOV component,

Are not the two big red disks near the link(s) the MOVs?
Each one is connected across one half of the primary so however the link is fitted they will each see 110V.

I believe you’re absolutely right, I would just leave it as it is and use external transformer.

Was it working correctly on 110V?

 

Are not the two big red disks near the link(s) the MOVs?
Each one is connected across one half of the primary so however the link is fitted they will each see 110V.


Was it working correctly on 110V?

Please forgive me I don’t understand what is MOV ! Yes it works fine with 110v

 

They protect everything else from voltage spikes by absorbing the extra energy.

 

They protect everything else from voltage spikes by absorbing the extra energy.

All right thanks Albert.

 

Are not the two big red disks near the link(s) the MOVs?

Hi A,
I misread that image, they looked like two Red wires bent over the PCB...
Thanks for the heads up.
E

 

Are not the two big red disks near the link(s) the MOVs?
Each one is connected across one half of the primary so however the link is fitted they will each see 110V.

Dose it means if I make the jumper connection on J2 I should get 220v ?

 

Hi A,
I misread that image, they looked like two Red wires bent over the PCB...

Hi A,
I misread that image, they looked like two Red wires bent over the PCB...

I apologies I should have make clear, They are two MOV, not wires

 

hi T,
No problem.
If you wire the primary as shown in post #5, it should be set for 220V operation.

E

 

I have just noticed that the jumper ID's on the board don't match those on the circuit.
Can you measure the resistance between the power input connector pins with the jumper in each of the two positions. The position which gives you the higher resistance will thre 220V position. One jumper position should give you twice the resistance of the other position.

 

hi T,
No problem.
If you wire the primary as shown in post #5, it should be set for 220V operation.

E

Thanks Eric I just can’t explain why the fuse blew when I did that

 

Looks like what might be a slight miss-application of that transformer as it would appear it was originally intended for 110/220 with primaries either series or parallel.
Which is more commonly seen now.
Also must be an old unit as N.A. power is 120/240 for many years now.
Max.

 

I have just noticed that the jumper ID's on the board don't match those on the circuit.
Can you measure the resistance between the power input connector pins with the jumper in each of the two positions. The position which gives you the higher resistance will thre 220V position. One jumper position should give you twice the resistance of the other position.

Hi Albert,

I measured resistance on J3 and it’s 111 ohm while on J2 it’s 219 ohm.