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1N5439: Varactor Diode or Zener

I brought and use them as 12V 5W zeners in 32S4P 400V 1A. When balanced, each 1N5439 draws around 400/128 = 3.1W. Occas...
24 comments posted 3yrs
posted by edward.ming.lee
24 comments posted 3yrs posted by edward.ming.lee

atiny13 to atiny25

I'm in the process of shfiting a board using Atmel's atiny13 to the atiny25. The at25 is causing lots of trouble. First...
7 comments posted 3yrs
posted by ht
7 comments posted 3yrs posted by ht

Photodocumenting your work

Like all the kids these days, I've been taking pics of my work -- PCBs, chassis wiring, etc. It's invaluable for docume...
39 comments posted 3yrs
posted by jimbmacarthur
39 comments posted 3yrs posted by jimbmacarthur

Re: femtoampere

> Paul Grohe wrote... > > > > al from Technical University Berl> >> > >> how are very low currents (fA range) measured?...
9 comments posted 3yrs
posted by pcdhobbs
9 comments posted 3yrs posted by pcdhobbs

Annual IRS rant

The Good: I like the auto calc within the sub-foms. I.e. 8949 auto calc and carry over to sched D. The Ugly: Sched D do...
22 comments posted 3yrs
posted by edward.ming.lee
22 comments posted 3yrs posted by edward.ming.lee

AI as a cult

https://www.msn.com/en-us/news/technology/ai-is-reviving-san-francisco-s-tech-scene-welcome-to-cerebral-valley/ar-AA18Eg...
22 comments posted 3yrs
posted by jlarkin
22 comments posted 3yrs posted by jlarkin

silicone grease is messy

Does anybody like something better? Like some thermally conductive, repairable, self-curing stuff?
27 comments posted 3yrs
posted by jlarkin
27 comments posted 3yrs posted by jlarkin

Slide Rule Lecture

Went to an interesting talk stemming from lockdown (when he really started collecting in earnest) where a former ICI ex...
2 comments posted 3yrs
posted by newspam'''
2 comments posted 3yrs posted by newspam'''

Smart meter IR monitor

Anyone know of a kit that will read the IR pulses from a smart meter and convert them into kW?
24 comments posted 3yrs
posted by kraken.sankey
24 comments posted 3yrs posted by kraken.sankey

interleaved A/D

I had a conversation of A/D converters recently, we speculated on the fastest topology, it must be interleaved sampling...
7 comments posted 3yrs
posted by r_delaney2001
7 comments posted 3yrs posted by r_delaney2001

Wind turbines used to absorb a power surplus?

An electrician (who I don't believe) told me if there's too much power on the grid, they use wind turbines as fans to a...
893 comments posted 3yrs
posted by CK1
893 comments posted 3yrs posted by CK1

load bank puzzle

I've been asked to design an 8-channel dummy load board. It's not very challenging but somebody's got to do it. It will...
37 comments posted 3yrs
posted by jlarkin
37 comments posted 3yrs posted by jlarkin

Is Bing Cuckoo?

This article claims Bing has a few bugs that need to be worked out.
0 comments posted 3yrs
posted by deanh6929
0 comments posted 3yrs posted by deanh6929