I posted about not being able to get the IR2153 chip to work. I had a bad connection on the breadboard; pin 8 of the chip didn't make contact. Feh.
- posted
18 years ago
D'oh, problem solved
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- posted
18 years ago
Well I've just spent two days panicking over a couple of prototype PCBs that didn't work: two identical PCBs, same fault on each- must be in the design, eh? Went through every aspect with a fine tooth comb, the comb I use for my fine teeth, everything seemed right. Then, desperation, let's check all the (176 pin PQFP) connections. SAME LEG NOT SOLDERED DOWN on both PCBs. Being SM, it LOOKED OK.
So, happy and triumphant now, though teeth a mess with not having been combed for a couple of days.
Paul Burke
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- posted
18 years ago
CMOS circuits have a nasty habit of sort of working with lousy waveforms and terrible frequency response when you forget to connect the power supply.
Fumes from the protection diodes and any high input states make it happen.
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