Fixing oscilliscope and L293 driver

[Brody Radford]

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
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