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sapril001(at)hotmail.com
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 Posted: Sun Jul 25, 2010 10:51 am Post subject: Jasco Voltage Regulator |
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Hi all,
I have a 24V Skytronics alternator and voltave regulator.
The voltage regulator is damaged, one of the power transistor in the regulator is blown, there are 2 power transistors in the regulator and the one that is driving the alternator field is blown. I have checked the alternator field circuit and it read about 6 Ohms, I think it is good.
I would like to know the PN. of the power transistors in this regulator, the manufacturer have scratched off the component number. My guess is they are TIP35 transistors, they are packaged in what look like a TO218 case.
Anyone can help?
Thanks
Sylvain April
C-GFFO Murphy Moose M-14P
Look 'em in the eye: FREE Messenger video chat Chat Now! [quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jul 25, 2010 12:49 pm Post subject: Jasco Voltage Regulator |
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At 01:50 PM 7/25/2010, you wrote:
| Quote: | Hi all,
I have a 24V Skytronics alternator and voltave regulator.
The voltage regulator is damaged, one of the power transistor in the
regulator is blown, there are 2 power transistors in the regulator
and the one that is driving the alternator field is blown. I have
checked the alternator field circuit and it read about 6 Ohms, I
think it is good.
I would like to know the PN. of the power transistors in this
regulator, the manufacturer have scratched off the component number.
My guess is they are TIP35 transistors, they are packaged in what
look like a TO218 case.
|
Does your alternator have one side of the field
connected to the b-lead, or does it go to ground?
If your field has one wire tied to ground, then
it's about a 99% bet that the pass transistor
for a switching regulator is a PNP device.
To saturate an NPN pass transistor, you need
a base-bias source that is at a higher voltage
than the bus. By using a PNP, you can turn that
puppy on by simply pulling the base toward
ground as shown in this sketch.
http://aeroelectric.com/Pictures/Schematics/Early%20%27Ford%27%20SS%20Regulator.jpg
However, if your alternator has one field lead
attached to the B-lead terminal, then your
regulator may indeed use an NPN pass
transistor not unlike this example:
http://aeroelectric.com/Pictures/Regulators/IR_Alternator_Circa_1980.pdf
They tend NOT to be specification critical.
As long as it's not a darlington transistor,
about any power device of the proper polarity
SHOULD function.
However, it would be helpful to understand why
the first device smoked.
Bob . . .
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