Electronics Forum / Electronics / June 2008

Hi, I have an old Micronta Digital frequecny Counter (red leds yet!) model 22-351.
I can't find a manual or any useful info on the net. I just have a simple question,
since I haven't used this thing in decades, of whether there is adequate impedence
or protection that I can just ...

Has anyone on this forum taken a course from the "Cleveland Institute of
Electronics" (CIE), and if so, what is your opinion of the school? Is it
worth the money?
If you don't won't to reply on this newsgroup, please email me at jcd (at)

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product you should go to www.cableslimited.com. i order from them and
they have same day shipping,

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Now that the digital photo frames are becoming more and more common, I'm
just wondering if there is such a thing as a seperate controller interface
for a standard lcd screen (VGA) that will allow the user to run a spare 15,
17, 19" monitor as a digital photo frame?

I've got an old power transformer that is meant for a tube amplifier.  It
has 3 filament windings and one HT secondary.  Running the primary direct
from the wall supply, 120v, the HT secondary with out a load is 655vac
across the outer legs.  It has a center tap that I ignored ...

Last weekend I threw out a perfectly good Roland A3 size DXY-980
Plotter, as no one wanted it. Of course as soon as I bin it, I get two
requests, one from Canada, and one from a local. I had posted this
message several weeks ago, before I tossed it.

Acquired a powered wheelchair with charger. The charger seems to signal two
charged conditions: "Bulk charge complete", and "Charge complete". Charging
seems to progress from the former to the latter. What's the significance of
bulk charge?

Need some help identifying several power supply capacitors that are
blown, inside a 200V DC power supply. The caps are axial (Poly film?)
and are labeled 103KV 630.
What are these? They are mounted across what appears to be a darlington

I have a spare 32" Samsung LCD PC panel from a completely destroyed casing
and would like to mount it in a current design SAMSUNG  tv case if anyone
has a tv with cracked/broken LCD that is not going to be used?
Panel might fit into other 32" casings - let me know here if you have ...

The item in photo is a coil of 20-gauge copper wire (with enamel or
varnish insulation), is 12 inches in diameter, weighs close to 5
pounds and has a resistance of about 25 ohms. The coil is wrapped with
electrical tape. Appears to have been homemade. Found it in a box of

It is likely this won't affect many, but we have good evidence of
counterfeit high voltage transistors from some suppliers. The types so
far affected are BU505 and MJE8502, these are 1500V VCES and 700V
VCEO. We noted failures in our products and traced to a very low VCEO

I know, not really repair, but this newsgroup has at least as good
suggestions as the others and I'll cross-post to sci.electronics.misc.
I need to either build or acquire an up/down counter with LED display
that is at least 5 digits, 7 preferred.  Count speed is 10 MHz max.

I need ~4 pogo pins for a one off test jig, it's not worth the dollars or
time ordering some from Farnell or whoever.
Anyone made their own out of old connector parts or small safety pins?
The PCBs I'm testing has corner mounting holes and has a 4 way 3.81mm pitch

Have a automotive battery charger/car starter which doesn't work quite
right.  Won't charge the battery up more than half-way, and I find 5.5VAC
rather than the expected DC of 1.5V (+/-) applied to the gate of the SCR
that seems to drive the whole thing (NTE5539).  My suspicions ...