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0 pointsErroneousBosh2mo ago0 comments

> If it's really 20MHz++ noise that's screwing him, you need something faster than a through hole capacitor IMO to deal with it.

That's always worked well enough in the past.

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6 comments · 1 top-level

dragontamer2mo ago· 5 in thread

That's because you weren't dealing with 20MHz noise.

Hobbyists are not dealing with 20MHz noise issues. Period. And if you are actually crazy enough to deal with high frequency circuits like that, you would well know that the land of through hole designs is simply insufficient, and that you are probably somewhere with some 0402 capacitors and some tweezers right now.

PunchyHamster2mo ago

> That's because you weren't dealing with 20MHz noise.

That is just straight up not correct

jacquesm2mo ago

> Hobbyists are not dealing with 20MHz noise issues.

It happens. Not often, but it does happen and it depends on the hobbyist and what they're up to (but you won't be sticking that together on a breadboard). Also: if you start using HCT, AHC or even G parts where you don't really need them it can happen to you in places where you don't normally expect it. Those things have crazy fast rise times.

dragontamer2mo ago

Real talk: 6 layer oshpark is cheap enough for a hobbyist and there are a bunch of 500MHz / DDR2 parts that can be laid out. Like 0.8mm pitch BGAs can fit and breakout.

So yeah. Hobbyists can go here. But here be dragons!!

Nonetheless, I continue to assert that typical hobbyists are making mistakes at 100kHz region rather than the 100MHz region.

ErroneousBoshOP2mo ago

Or analogue. 20MHz is basically only just above audio. You can amplify it with a cheap jellybean opamp that requires no particular care to use.

ErroneousBoshOP2mo ago

> Hobbyists are not dealing with 20MHz noise issues.

What makes you think that?

Edit: FWIW I consider 20MHz to be basically audio.

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