RS Wall Wart
ard at p850ug1.demon.co.uk
Fri Jul 18 12:34:04 CDT 2008
> Are batteries that expensive? Seems to me you should be able to pick
> up some cheap drug-store C cells for under $10.
I don't know about the States, but over here, 'Pound shops' (the
equivalent of your Dollar stores, I guess) sell standard batteries. The
quality is not great, but a couple of packs of C cells from there would
probably do for testing an electronic game.
> Lastly, it seems like it is almost a requirement that anybody who is
> interested in collecting classic hardware invest in a good laboratory
> power supply with variable current-regulated output. 6 C batteries
I certainly agree. The 3 insturemnts that get used _a lot_ on my bench
are (in no particular order) :
1) A Multimeter. Actually a Fluke 85. I'd prefer an 87, but I found a
second-hand 85 at a good price becasue some display segements were out.
Cleaning the Zebra strips fixed that. I have to clean them again from
time to time, but it's very obvious when it needs doing, and it gives
accurate readings. The only thinkg I don't like about it is the fucntion
swithc (including power on/off) partly formed by a wiping contact on PCB
2) An HP LogicDart. Need I say more?
3) A bench PSU. I built a Velleman kit one -- 30V 8A continuous, 10A
peak. The advantage of the kit is, even if I say so myself, I know it's
been built properly, that safety earths are in place, and so on. Which is
more than I can say about some commercial Far-eastern supplies at a place
I was working.
> 9 VDC. I'd set my lab supply to 8.9V, clip alligator clips to the
> battery terminals, and play away. Similarly, somebody who hasn't
Another very useful thing that I bought (from Maplin) was a set of all
hose little 2-pin plug to power-connector adapters (the Adaptaplugs you
mentioned, I think) and a cable with a socket to take those moulded on
one end and, IIRC, spade lugs on the other. I cut the latter off and
fitted 4mm plugs to go on the bench supply, fitting them so that if I put
the red plug in the +ve socket of the supply, the polarity of the final
power plug would be as indicated on it.
That set-up has been very useful for powering up all sorts of things
fitted which were supposed to use wall-warts.
Another useful cable is a car cigar lighter socket to 4mm plugs. To run
in-car adapters, etc, off the bench supply.
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