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PSoC 1
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Looks really like a bad power-supply or a bad grounding. Check your supply voltage with a scope turned to AC and high gain to measure the ripple of the supply voltage. Check the capacitor between Vcc and GND for proper value.
Bob
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If you look at the Miniprog1 PCB looks like a sizable C connected to
Vdd at the interface pin. So you are seeing additional C when it is
attached to your header.
If you have a DSO you can see what spectral components are present
and tackle source problems appropriately. Eg, is it 50/60 Hz or a ripple
produced by some switching element. Then filter appropriately.
Regards, Dana.
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Hi,
Thanks to both. I thought so too. The problems is that I don't have the PCB here, and the tests is being made by another person that doesn't understand much about electronics so I will try to use a better cap for next revision, anyway at the end it will work with batteries so no worries 🙂
Thank you!