From: Robin M Allen <rallen@xxxxxxxxx>
I'm planning to make a mains power supply for a T32 flash... I just wondered
why there are 3 pins on the power in connector.
One is for ~+180 VDC, one for +6 VDC, and the last one is a common return.
Is there a diode to stop
the batteries in the T32 from receiving a current 'backwards' through them
There seems to be something protecting the batteries, as I have
powered the T32 through both external sources without mishap.
Has anyone done all this stuff before and I missed it?
I posted here similarly, and got a big yawn. I eventually built a
heavy-duty power supply that can run as many T32s at once that you
can drive from the TTL connector. (I think the supported fan-out is
seven.)
I bought a 150 watt DC-AC inverter. It takes 12 VDC in, and supplies
117 VAC, 60Hz. It does this by generating the necessary high voltage
in DC form, then stepping it to generate a pseudo-sine wave.
The DC HV supply was only about 150V, so I pulled the HV transformer
and removed some windings on the primary to get the output up to 180V.
You'd have an easier time of it in Finland, where your inverters
would generate ~ 300 VDC internally. Then you'd just have to either
add a simple series-pass regulator, or remove some windings from the
HV transformer secondary. (I didn't feel too good about removing
primary windings, but the extra current didn't seem to hurt the
switching transistors.)
I dont suppose the
connector is some standard item that I can buy separately?
I haven't seen one. I used Molex pins -- like those that feed power
to a disk drive -- then potted them in silicone caulk. It's ugly, but
it works.
: Jan Steinman <mailto:Jan@xxxxxxxxxxxxxx>
: Bytesmiths <http://www.bytesmiths.com>
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