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The input level sensitivity is definitely a good point. Sounds interesting!

Digging the redesign. But, better than the DMM? I’ll have to give it a shot in that case.

Great job all around! The layouts of your recent pcbs look really nice. What can you tell us about the I/O daughterboard?

What’s going on here? Sorting error? And yep, that substitution is fine.

UNBELIEVABLE. HE’S OUTDONE HIMSELF! EDIT: Just now noticing the two resistors next to the ‘double helix’ text. Awesome design choice! I think I’m going to need re-read this a few more times to take it all in.

Unless making a ton of old comps without a retrofit for modern components, this really doesn’t need to be on the “must have” list.

I think I remember a project like that a few years back. I’m not sure where I saw it—hopefully someone remembers.

I didn't use a scope for mine. I did measure the clock frequency limits though.

Do it.

We’ll just have to see then won’t we?

RIP Troubleshooting Forum.

Garage too. It’s wild.

Oh?

Yeah, it’s been hit or miss for me too. I think the ‘print white twice’ was more understandable when the service was starting out and things were being established, but at this point it’s basically putting a failure of their service onto the consumer.

In all fairness, this has AC power input and not something you’d come across in the typical kinds of projects we work on.

Those are ferrite beads. They’re labeled as inductors (the ‘L’ designator), but are a bit different. The specs there state the equivalent resistance at a given frequency. Here they are mitigating EMI (like you’d see with the blocky cylindrical part of a power brick cord). I’m not sure if those...

Has anyone ever had this happen with Si transistors?

Yep, that seems right. You’d install cap(s) with one leg on the switch and the other to ground and wire the switch common to that pad.

I would think a J201 would be a better choice for a source follower biased to Vref given that the Vgs(off) for the J201 is 0.3–1.5V and the 2n5457 is 0.5–6.0V. A 2n5457 on the upper extreme of the spec could clip, right?

You use it for work or something?