Unstable voltage regulator on MSP430 Launchpad?

No description available.

Category:

Science & Technology

Tags:

• msp430
• launchpad
• texas
• instruments
• ti
• voltage
• regulator
• oscillations

[thewii552]

what kind of scope is that?

[ubuntututorials]

@thewii552 HP 54501A digitising 100 MHz 10 MS/a oscilloscope from '93.

[thewii552]

@ubuntututorials looks nice!

[ubuntututorials]

@thewii552 Thanks, it was second hand and only cost £150.

[MystBoy666]

maybe your led is nearly broken...

[ubuntututorials]

@MystBoy666 I don't think so, it's only a 5mm low current yellow LED. I did use a 330 ohm resistor, much bigger than necessary for 3.3V.

[tomsixsix]

This turned out to be a problem with my scope itself! The power supply had a lot of dust in it and was causing the rails to go out of spec. Eventually the scope would just power cycle. A good cleaning out and it has worked for more than a year! Nice scope inside too - full of quality components.

[thewii552]

@ubuntututorials I am now jealous

[ubuntututorials]

@ehrichweiss Funny thing is, I can't replicate it. I suspect they cheaped out on the regulator, maybe used a smaller cap than they should have.

[ehrichweiss]

I think you may be onto something. I was playing with the temperature function and noticed a LOT of spikes, mostly downward. A drop in voltage would explain a lot.