HP97 The journey begins
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04-29-2019, 03:43 PM
Post: #66
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RE: HP97 The journey begins
(04-29-2019 01:25 PM)teenix Wrote:(04-29-2019 11:56 AM)Harald Wrote: I can see an inductor on your PCB. Presumably you are generating a voltage you need by means of a switched mode power supply. It might be a long shot, but is it possible noise from your power supply is causing the trouble? Have you tried shutting it down and supplying the circuit from a bench power supply? Sorry Tony, I got distracted while reading your post (at work), and didn't read as far as you mentioning the power supply... D'oh... On the classic replacement board I am using a voltage double IC to avoid any problems with a switched mode power supply. I am using a MAX1683. On my design all I need is the 3.75V bat and the 7.2V for the display drivers. But that volatge is not critical, so I have simply used the volage doubler to generate it from the battery voltage. Cheers, Harald |
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