Re: 27 VAC to 32 VAC?
- From: "Chris" <cfoley1064@xxxxxxxxx>
- Date: 14 Apr 2006 21:11:54 -0700
Dan Beck wrote:
"James Thompson" <Jamesthompson2002@xxxxxxxxxxx> wrote in message
news:45ec9$44406307$438c8615$12873@xxxxxxxxxxxxx
Hello James,
I agree with chris in that your needs as far as what you are running, can
still operate on the 27 vac. What is the circuit you intend to run that
is needing 32vac?
thank you for your attention to my queries. I am wishing to build a test
device for pinball machine circuit boards, for a particular series of
electronic pinballs. Within this series there were a number of iterations
of score displays, used in the games. The transformer I have does not
provide the necessary voltage for the newer type of score display I would
wish to test. The new type of display in question requires 32 VAC; this
voltage is subsequently (on the score display pcb) rectified and
"boosted/bucked" (I hope I have those terms correct) to -45 VDC and -15 VDC
respectively. These voltages are then used by the digit driver ICs on the
pcb. I am sorry for the long-winded answer; I felt some background was
necessary. You may be correct, the 27 VAC may be enough; I just haven't
built the thing yet to test. What do you think? I will also add more
material in response to Chris's post above.
Regards,
Dan
Hi, Dan. There are several variables to take into consideration.
Here's the drill:
Get a 100 ohm 10 watt resistor. Hook up your 27VAC transformer to the
line, and measure the output voltage. Then briefly attach the 100 ohm
resistor, and measure the output voltage again.
If both of thee readings are over 30V (they probably will be), then you
should be OK using the transformer as-is. All electrical equipment is
made to tolerate variances of at least +/-10% in line voltage. If
you're within that, you're OK for a repair-type quick&dirty test
fixture.
To be safe, you may want to take variations in your line voltage into
consideration. As I said, if you use a Variac or autotransformer, you
should be able to crank input voltage up to 132VAC or so without
causing the transformer any grief. That way, you'll be able to provide
precisely 32VAC to your test fixture every time. That's what I'd do.
Good luck
Chris
.
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- From: Dan Beck
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- From: Chris
- Re: 27 VAC to 32 VAC?
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