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Author Topic: Changing a 115v tranny to a 240v one  (Read 15317 times)

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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #15 on: Time Format »

Hmmm, now that's mighty handy !!
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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #16 on: Time Format »

Yep ideal to put in your pq-3 and to get rid of those zener diodes.
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #17 on: Time Format »

Marshall there's one more thing I'd like to ask coz this has got me really confused.

I know from what you've told me before your PQ3 does not have an On/Off switch just the EQ On/Off thing. As you know i'm going to fit an IEC socket inlet with switch and fuse on my unit. Let me try and explain what's confusing me so much !

The IEC Socket says it's 250v 10A fuse, but surely a 10A fuse is massive for this, I have Two other units a compressor and a Graphic EQ which both have the IEC sockets, But the fuses inside those are both slow blows t160mA and the other is a t200mA. Now from what I've been led to believe the Fuse here is to protect the Primary in the tranny from blowing what size of fuse should i be using here ?

I see from the Toroidial you have and the one i ordered the secondary current Nom says 167mA so is that the fuse size i should be getting and putting in there ?

Regards
Ray
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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #18 on: Time Format »

The power is 5VA on that transformer so the primary max current will be 21.7mA,so best is to use a T100mA fuse if you can get one.
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #19 on: Time Format »

Brilliant Marshall many thanks man I appreciate it  :)

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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #20 on: Time Format »

No problem that's what I'm payed for  :lol:
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #21 on: Time Format »

LOL  Yup...Hey I knew i had a better schematic set somewhere for the PQ3 I found Em all...here ya go  Enjoy..
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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #22 on: Time Format »

Thanks,seems my unit is from 1982.Neither schematic seems to fit my unit.
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #23 on: Time Format »

How strange, my unit has a date stamp of 83 inside it presuming it's 1983 of course, the wiring across the eq pots look similar to yours in that wiring diagram, but it's totally different on mine at that point as mine are all mounted straight onto the pcb. I know there was a later re-issue I'm presuming that was the Blackface version with a front Input, i know we both seem to have the original Greenface with the red knobs.
Sorry the schematics don't seem to correspond to your unit I'm afraid that's all the schematics i could get on it.
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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #24 on: Time Format »

I dated mine with the date stamp on the pots.

I also found the green ones (original ones) were made from 76 to 81 and they changed the green to black.
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #25 on: Time Format »

Hi Marshall, Ok my Transformer I ordered from Farnell finally arrived today it was out of stock hence it took so long coming. Could you check me on my wiring please?
Primary winding colours (3 wires) Brown 240v, Blue 0v and Grey 115v
Secondary winding colours (4 wires) Red 15v/0.167A, Black 0v, Yellow 15v/0.167A, Orange 0v
I assume i join the Black and Orange wires of the secondary to give me the centre tap ?
However the Primary colours are a little confusing for me, I presume the Brown 240 is the Live (goes to fuse), the Blue is Neutral, so that would leave the Grey 115v as Ground ?  is that correct ?  If not could you please advise
Thanks
Ray
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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #26 on: Time Format »

Yes black and orange togheter for the center tap

DON'T ground the grey wire unless you want to order an other one  :nono:  ;D
Just put a piece of shrink tube over it (or some tape if you have to),it doesn't have to be connected.
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #27 on: Time Format »

Ohh I see so with the primary side it's basically a choice then as in 240v OR 115v the one you want you use(in my case the 240v), the one you don't you just do not attach it and blank it off so it doesn't make contact with anything at all.

Great Marshall many thanks once again
regards Ray
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MarshallJMP

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Re: Changing a 115v tranny to a 240v one
« Reply #28 on: Time Format »

yep that's it

No problem, let me know if you need other  info.
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scsibear

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Re: Changing a 115v tranny to a 240v one
« Reply #29 on: Time Format »

Hi Marshall I ran into an issue, the fused IEC & switch combo i bought is actually too big for the chassis so I'm just going to get a fused IEC socket instead, there is an SP on-off switch already on the unit anyway and I was wondering if i can use that ? it seems to be a Swann series 40 (2 pins) but it says 12v on it, would i be able to use that switch or do i need to get one rated at 240v. The one in the unit doesn't say anything about Amps, i went to the web site and they sell an SP on-off 16 Amp 250v almost an identical switch but I just don't know what amp/voltage rating i should be using.

Please advise
regards
Ray
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