Electronics Design

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Greenland really was green 400,000 years ago

https://www.sciencedaily.com/releases/2023/07/230721113113.htm The evidence is "bulletproof" according to scientists. T...
16 comments posted 3yrs
posted by soar2morrow
16 comments posted 3yrs posted by soar2morrow

Ball Join Push/Pop

BJ pop: https://www.ebay.com/itm/155476325387BJ push: https://www.ebay.com/itm/204287982201 The problem is that some BJ...
8 comments posted 3yrs
posted by eddy711lee
8 comments posted 3yrs posted by eddy711lee

I2C speed

Hi, I need to bit-bang a fast mode I2C stream and started reading the I2C specs from Philips carefully. Table 11 says t...
13 comments posted 3yrs
posted by bombald
13 comments posted 3yrs posted by bombald

paper vs. metal and rubber

The anti vehicle paper device killed metal (control arm) and rubber (CV axle). Already replaced control arm. Need to re...
26 comments posted 3yrs
posted by eddy711lee
26 comments posted 3yrs posted by eddy711lee

Waiting hours, but not for charging.

My car's arm was bended a week ago. After street cleaning, dropping down the curb broke it. My right back wheel remain...
43 comments posted 3yrs
posted by edward.ming.lee
43 comments posted 3yrs posted by edward.ming.lee

pcb trace fusing currents

There are wire and pcb trace fusing calculators online, and in the Saturn software and such. They use the Onderdonk or...
16 comments posted 3yrs
posted by jlarkin
16 comments posted 3yrs posted by jlarkin

Fwd: OT: Why so few airplanes with canards?

-------- Forwarded Message -------- Subject: Re: OT: Why so few airplanes with canards? Date: Thu, 27 Jul 2023 00:05:55...
0 comments posted 3yrs
posted by dp
0 comments posted 3yrs posted by dp

OT: Why so few airplanes with canards?

Sci.aeronautics is dead, it seems, so allow me to ask here. At least it's not about climate, politics or removing X sig...
3 comments posted 3yrs
posted by jeroen
3 comments posted 3yrs posted by jeroen

Datasheet needed

Gentlemen, I'm trying to find a datasheet for the BLX67 transistor but so far without any luck. Various sites on the we...
3 comments posted 3yrs
posted by cd
3 comments posted 3yrs posted by cd

Welcome to San Francisco

https://www.youtube.com/watch?v=yUzc15BeAaE We walk that bit of Sanchez Street and those stairs fairly often. My favori...
11 comments posted 3yrs
posted by jlarkin
11 comments posted 3yrs posted by jlarkin

many relay drivers

https://www.dropbox.com/scl/fi/40slcbgbngggdcwwt95vi/Relay_Drivers.jpg?rlkey=gfai2trx0n6bnja2yl4hber7i&raw=1 I like C1,...
19 comments posted 3yrs
posted by jlarkin
19 comments posted 3yrs posted by jlarkin

LT Spice question

I got this model for a mosfet, FDB390N15A https://www.dropbox.com/scl/fi/ko6yvs1jo1j4svunwrmtc/FDB390N15A.lib?rlkey=o01...
3 comments posted 3yrs
posted by jlarkin
3 comments posted 3yrs posted by jlarkin

Crowbars

Gentlemen, I need to protect some expensive RF transistors from over-voltage. They're fed from a linear supply which is...
31 comments posted 3yrs
posted by cd
31 comments posted 3yrs posted by cd

another pcb in progress

https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1 This will be a 3-...
3 comments posted 3yrs
posted by jlarkin
3 comments posted 3yrs posted by jlarkin