Boss GT5 guitar multi effects pedal ...

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Arfa Daily - 03 Jul 2009 11:15 GMT

Anybody by any remote chance got schematics for this thing, or know the
(voltage) specs for the power transformer. Funny slimline core. Primary o/c

:-(

Two secondaries by the looks of it, one CT, the other not. Worst case, I
could probably graft two separate transformers in. If no one has the
transformer data, then I'll just have to make an educated guess, based on
the filter cap voltage specs.

TIA

Arfa

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Dave M - 03 Jul 2009 12:41 GMT

> Anybody by any remote chance got schematics for this thing, or know the
> (voltage) specs for the power transformer. Funny slimline core. Primary
[quoted text clipped - 8 lines]
>
> Arfa

Any chance that you can open the wrappings from the windings and see if
there's a thermal fuse in there that's opened?
If not, maybe you can get a bit of an idea if there are any voltage
regulators in the power supply that you could use to derive one of the
secondary voltages. Once you have that, just apply that voltage to winding
and measure the voltage on the other winding. Derate by about 10% and you
should be pretty close. Out of circuit, of course.
Use your best judgment on the VA rating of the transformer. Use catalogs
from various manufacturers such as Hammond, Signal, etc. to get size vs. VA
estimates.

Dave M

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Arfa Daily - 03 Jul 2009 15:20 GMT

>> Anybody by any remote chance got schematics for this thing, or know the
>> (voltage) specs for the power transformer. Funny slimline core. Primary
[quoted text clipped - 21 lines]
>
> Dave M

I'm sure that there's gonna be a TF buried in the windings, Dave, and that
it will be open, but unfortunately, there's not anything that you can see -
even just its wires to whack a short across to get the tranny temporarily
running to measure its secondaries. All of the things that you suggest for
determining its ratings by 'guesstimate' are exactly what I would be doing
too, just thought I would post in case anyone had a definitive answer, to
save me the trouble of having to work it all out ...

Thanks for your thoughts :-)

Arfa

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Meat Plow - 03 Jul 2009 14:36 GMT

>Anybody by any remote chance got schematics for this thing, or know the
>(voltage) specs for the power transformer. Funny slimline core. Primary o/c
[quoted text clipped - 8 lines]
>
>Arfa

The Boss GT6 uses an 18 VAC secondary.

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Arfa Daily - 03 Jul 2009 15:24 GMT

>>Anybody by any remote chance got schematics for this thing, or know the
>>(voltage) specs for the power transformer. Funny slimline core. Primary
[quoted text clipped - 11 lines]
>
> The Boss GT6 uses an 18 VAC secondary.

Interesting, Meat. Two of the caps in there are 1000 @ 35v so that would
fit quite nicely with 18-0-18 for about + / -26v DC, which would be ok as
input for a pair of 15v regs. I haven't looked too closely at the psu yet,
to see what mono regs are in there. Prolly be Monday now. Thanks for
looking.

Arfa

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Meat Plow - 04 Jul 2009 16:00 GMT

>>>Anybody by any remote chance got schematics for this thing, or know the
>>>(voltage) specs for the power transformer. Funny slimline core. Primary
[quoted text clipped - 19 lines]
>
>Arfa

Didn't have to look. My Boss Jam Station and GT6 use the same 18VAC
supply.

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Arfa Daily - 06 Jul 2009 01:31 GMT

>>>>Anybody by any remote chance got schematics for this thing, or know the
>>>>(voltage) specs for the power transformer. Funny slimline core. Primary
[quoted text clipped - 23 lines]
> Didn't have to look. My Boss Jam Station and GT6 use the same 18VAC
> supply.

Furrynuff ... :-)

Arfa

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Electronics Forum / Repair / July 2009

Boss GT5 guitar multi effects pedal ...