I tried the first two suggestions and thought (initially) that all was good but upon watching in detail it would seem that it is the same.
I have a L78M05 to hand - is that going to do the job? Otherwise I can get something like this https://uk.rs-online.com/web/p/low-dropout-voltage-regulators/1246447/ very quickly. On Wednesday, 20 November 2019 15:33:20 UTC, Kevin A. wrote: > > Here would be my first 2 suggestions in changes to your circuit: > > #1: I would definitely place the ground from my logic circuits straight to > the main power ground, instead of routing it though the 5V buck module. The > buck converter is also a switching power supply and this could very well be > coupling noise through the rest of your circuit, especially if it is the > only ground path for the logic. > > #2: If #1 does not fully alleviate the problem, I would try placing an > electrolytic cap of between 100-470uF on the 5 volt rail close to the logic > circuits. This could help decouple the logic from any noise entering > through the 5V rail. > > Finally, if the above two do not solve the problem, I would use a linear > regulator after the 5V module to provide a clean 5 volts to your logic > circuits. It looks like the 5V module has a trim pot on it, so I would > increase the voltage to 6 or 7, and then use a 5 volt LDO (low dropout > regulator) to provide the final 5 volts. This certainly will alleviate a > large amount of noise on this line that you might not even be able to > observe on your scope, unless you zoom in quite a bit on the vertical > (voltage) scale (so that you're looking at hundreds or even tens of > millivolts per division). > -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7e183735-7ca9-4287-8cc8-51e22a65d43f%40googlegroups.com.
