Easiest way to hunt for oscillations is to use AC coupling, and start with 100mV/division, and 100usec/division. The exact frequency of the oscillation isn't important; what you want is less than 100mV peak-to-peak of noise. If you see 60Hz noise, either your 'large' electrolytic cap (usually > 1000uF) is too small or it dried-out. To get rid of high-frequency noise, start with small bypass-quality caps, around 0.01uF as close as possible to the regulator inputs & outputs. Large caps have parasitic resistance and inductance that limits their ability to attenuate higher frequencies compared to smaller-size (hence smaller-value) bypass caps.
BTW, the 475 is a very nice analog scope; when I was a tech in the 1980s, I debugged a lot of computer boards with a 475. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/081ff4f6-f954-4ad0-9256-3e28552f75b9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
