Electronics Design

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Foolproofing open-collector outputs

Is there a relatively foolproof way to protect open collector outputs against over-voltage/over-current, when they're o...
25 comments posted 5yrs
posted by user
25 comments posted 5yrs posted by user

LED driver circuit.

I have a number of G9 non-dimmable led lamps (230V, 3W, 300lm). One just failed with very low light output, so I though...
6 comments posted 5yrs
posted by jmlayman
6 comments posted 5yrs posted by jmlayman

PSTN interface issues

I have a fancy box that implements a "voice attendant" for our home phone. Colleagues have duplicated it for use on the...
10 comments posted 5yrs
posted by blockedofcourse
10 comments posted 5yrs posted by blockedofcourse

tiny table saw

I got my tiny saw, with the optional thin carbide blade. Works great. There's a hint of a burr on the bottom of the boa...
0 comments posted 5yrs
posted by jlarkin
0 comments posted 5yrs posted by jlarkin

Flyback controller, second source

Hi I am working on a offline flyback with separate controller and FET, sort of a side project I am using the NCP12510 (...
0 comments posted 5yrs
posted by klauskvik
0 comments posted 5yrs posted by klauskvik

8.5 digit dvm

https://ohwr.org/project/opt-adc-10k-32b-1cha/wikis/home Cheers -- ----Android NewsGroup Reader---- https://piaohong.s3-...
17 comments posted 5yrs
posted by martin_riddle
17 comments posted 5yrs posted by martin_riddle

-110dB Low Noise Ripple Filter

Following on the -50dB ripple filter I posted earlier, here is a version that gives -110dB: 1 mHz : - 110 dB 1 Hz : - 1...
31 comments posted 5yrs
posted by spam
31 comments posted 5yrs posted by spam

some old technology

We were driving home and stopped in Auburn CA for lunch. https://www.dropbox.com/sh/e6tised0trsgta9/AAAqQFJJdSmIhV1C0Fv...
4 comments posted 5yrs
posted by jlarkin
4 comments posted 5yrs posted by jlarkin

Passive Car Battery Trickle Charger

Gentlemen, When you don't drive much any more it's handy to keep a battery topped up so you don't find it flat on those...
173 comments posted 5yrs
posted by cd
173 comments posted 5yrs posted by cd

Discrete floating current sensor

Hi, The purpose of the circuit attached below is sensing the state of the switch S1. If the switch is on, it should con...
3 comments posted 5yrs
posted by peter.pan
3 comments posted 5yrs posted by peter.pan

MMBT4401 Ve_b

The data sheet says 6V but that is pretty much a standard data sheet value. Has anyone here measured one (or more)? If I...
8 comments posted 5yrs
posted by Sophi.2
8 comments posted 5yrs posted by Sophi.2

diy Gyrotrons?

So we currently have gamma-spectrometry communities, and hobbyist Lenard tu bes with e-beams in air. But no diy Gyrotro...
3 comments posted 5yrs
posted by billb
3 comments posted 5yrs posted by billb

Processor choice

I had to have my septic tank pumped this week. The guy had this nifty little flushable transmitter that he flushed down...
61 comments posted 5yrs
posted by jgd
61 comments posted 5yrs posted by jgd

OT A modest proposal

I just love this. A warning, it's 1/2 satirical, and to Trump voters, don't let the first bit piss you off. He's a libe...
37 comments posted 5yrs
posted by ggherold
37 comments posted 5yrs posted by ggherold