Adrian D. Ives wrote, On 27/10/09 17:34:
I recently acquired a Grundy NewBrain PSU with the intention to use it
with a NewBrain Model A that I had recently purchased second hand. As
soon as the unit arrived I knew that I recognized it from somewhere,
yet I have never had any previous exposure to the NewBrain (this new
interest only came about after watching Micro Men). Anyway, I was
astonished to find that the computer-side lead terminated in a QL
power connector. Needless to say this will not fit the 6 pin BERG
connector on the NewBrain and, anyway, three pins can't carry three
power lines and a ground return.
I did some research on the internet and discovered that it's possible
to use a NewBrain PSU to power the QL by connecting directly to the
transformer secondary for the AC source and shorting out the
temperature trip to allow the unit's 6.5V DC output to overrun enough
to run the QL's 9V input (QL needs 1.8A, the NewBrain PSU is rated to
1.2A). I have to say this seems like a rather dubious arrangement to
me, but, anyway, my real question is this:
I'm sure I have a vague memory of using a PSU just like this to run a
QL in the distant past. Were these ever converted and sold
commercially as alternative QL PSUs? I'm just interested.
They certainly were, and as you say the use was dubious. These were
converted by Dennis Briggs.
I had two running by BBS in the early 90s. They both died eventually,
smelling of burning, so not worth even trying (8-)#
And I don't suppose anyone could recommend a source for the 6 pin BERG
connector (two rows of 3, keyway centre top, opposite side to guide)
so that I can put this PSU back to its original state?
'fraid not.
Tony
--
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