Hmmm --
Who is the manufacturer? If you are so lucky as to have one of the old
Tektronix 540 vacuum tube tanks, you my be in luck.
Call up Tektronix support (the number should be in that manual) and with a
suitable mixture of pleading and groveling they may inform you that there is
a repair kit for the power supply.
If its an offshore clone, I suggest finding someone who needs a door stop or
boat anchor.
Bob Smith
--- Avoid computer viruses, Practice safe hex ---
-- Specializing in small, cost effective
embedded control systems --
Robert L. (Bob) Smith
Smith Machine Works, Inc.
9900 Lumlay Road
Richmond, VA 23236 804/745-1065
[EMAIL PROTECTED]
----- Original Message -----
To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]>
Sent: Friday, December 13, 2002 1:23 AM
> Hi everyone, I have a couple of questions.
> 1) Can the inputs and outputs of the L293 motor driver be connected in
> paralell to increase the current output available? The motor I want to
drive
> would draw about 1 amp. more in peak (used in a small RC car-turned-robot
> project).
>
> 2) I just bought a faulty oscilliscope (model bwd 540 if that helps -
quite
> old...) which has a problem in the powersupply area, but control panel
> lights still come on so I'm quessing its not the main transformer. There's
a
> smaller transformer (say 4x4x4 cm) which as far as I can tell is the
source
> of a buzzing/spluttering sound when powered up. It outputs several
different
> voltages, 2 or 3 are around 15 to 30v, one is 4.5Kv and one is ~1.5Kv
> (fortunately I have a service manual for it). There was a 2200u, 25v cap
in
> the rectification part of the low voltage outputs which has some crusty
blue
> stuff around the terminals and had a very low resitance (something like
150
> or 200 ohms instead of the 500-odd Kohm of the surrounding caps). I
replaced
> this but to no avail, so my conclusion is thus : the cap dried up and
caused
> a short in a particular transformer coil which
> took out one or two of the others, perhaps one of the high voltage ones
and
> this is now arcing. So what can I do to fix it from here? Does it sound
like
> I've tracked down the problem correctly? I really need an oscilliscope to
> fix it...
>
> Thanks for inputs
> Brody Radford
>
>
>
>
> _________________________________________________________________
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>
> --
> Author: Brody Radford
> INET: [EMAIL PROTECTED]
>
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>
--
Author: Robert Smith
INET: [EMAIL PROTECTED]
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