Just a question: Did you put a load on it? Might be floating higher than
spec with no load.
Jonathan
On 10/10/2013 7:18 AM, zac wrote:
Hey all-
A while back I purchased this item
<http://www.ebay.com/itm/12v-DC-to-AC-Car-Power-Converter-Adapter-Inverter-New-Cu3-/121191268127> on
ebay, with the intent of using it's guts in another project. Upon
receiving and shelling it, I discovered that it was not producing the
claimed 120VAC, rather, it was producing about 170.3VDC! I am
currently in the middle of a nixie project as well, and thought that i
might be able to use the circuit for that, although i might rebuild it
to a smaller footprint.
Does this look like a design any of you have encountered before?
Some on-hand observations-
Under the heat-sink is a TO-220 package, the only marking is "D880" -
I have serched it, and found a D880 transistor,
The small cap is a 50V 10uF
The large cap is a 400V 2.2uF
What appears to be a mylar film capacitor is marked 2A4
you can't see it in the top down picture, and the markings are facing
the wrong way for the side-view, but right in front of the heat
sink/TO-220 component is a small ceramic disk capacitor, 4.7pF.
The leads bent off to the right are to an LED, to indicate when it is
powered.
Slightly harder to see in the picture are the two holes where i
removed the leads coming from the Vin attachment meant to be used in a
vehicle cigarette lighter jack, so 12VDC in.
The leads on the left are the Vout. Originally, there were big clips
at this spot used to hold the prongs of a standard us non grounded
wall plug.
I have attached 4 pictures, one top-down, one bottom-up, and two from
the side, one with a focal point on the near side, and one with a
focal point on the far side.
Any insights?
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