OT: What's this type of bracket called?

Started by Sylvia Else in sci.electronics.design48 minutes ago 65 replies

https://www.dropbox.com/s/b4b15o0hgno2ldu/bracket.jpg?dl=0 The perspective is a bit off - the angles at the end are about 45 degrees. I made...

https://www.dropbox.com/s/b4b15o0hgno2ldu/bracket.jpg?dl=0 The perspective is a bit off - the angles at the end are about 45 degrees. I made this one myself out of aluminium tubing, but I've already had one crack and break at the bend. So I'm trying to buy a steel one, but I can't even figure out what to search for. Sylvia.


Best hi res tech pics

Started by Anonymous in sci.electronics.design50 minutes ago 1 reply

I collect good pics for my wallpaper folder. Here's a few. Not small, but guaranteed to be great!

I collect good pics for my wallpaper folder. Here's a few. Not small, but guaranteed to be great!


Increasing EL inverter drive power

Started by bitrex in sci.electronics.design51 minutes ago 5 replies

Not sure if the EL material I have available is less efficient than how it used to be back in the day, but this inverter circuit: Can't...

Not sure if the EL material I have available is less efficient than how it used to be back in the day, but this inverter circuit: Can't drive some replacement EL material (the material tends to itself fade out with time) I've put under the LCD display to very decent brightness. It's too dim under room lighting. Power is 5V supplied bottom right, I'm ass


Film capacitor as power-supply filter

Started by Anonymous in sci.electronics.design1 hour ago 51 replies

Is there any reason not to use a 20-uF 900-volt film capacitor as a power supply filter? I'm updating a vintage Heathkit capacitor checker that...

Is there any reason not to use a 20-uF 900-volt film capacitor as a power supply filter? I'm updating a vintage Heathkit capacitor checker that I use regularly for re-forming electrolytics, and its power supply filter is currently two 40-uF 450-V in series, without balancing resistors; applied voltage is nominally 600 V DC. This hasn't given any trouble, but I'm uneasy about its future. Now...


Amplifer Design

Started by Cursitor Doom in sci.electronics.design1 hour ago 15 replies

Greetings, gentlemen, This is the schematic of the CRO x-amplifier I've been investigating lately. It's supposed to provide sufficient...

Greetings, gentlemen, This is the schematic of the CRO x-amplifier I've been investigating lately. It's supposed to provide sufficient potential difference to the x plates in the tube so as to sweep the electron beam left to right in accordance with the timebase setting: https://yandex.com/collections/card/5da36a58f05bf23ffde0742e/ At first I thought this was operating as some kind ...


Renewables Just Keep Getting Better

Started by Rick C in sci.electronics.design1 hour ago 35 replies

I ran across this article about an Indiana utility having rejected a bid for fossil fuel generation based on cost and risk. "Vectren’s...

I ran across this article about an Indiana utility having rejected a bid for fossil fuel generation based on cost and risk. "Vectren’s 2016 proposal to replace coal with a gas plant was declined as too large and financially risky for the small utility, requiring a new bid – which recently came in showing wind, solar and storage dominating the list of offers." I


Running ethernet over Van Damme 268-307 6 x 75 ohm cable

Started by Peter in sci.electronics.design1 hour ago 6 replies

Hello All, For complicated reasons I have this cable in place. It was installed 20 years ago and is inaccessible except at the ends. Total...

Hello All, For complicated reasons I have this cable in place. It was installed 20 years ago and is inaccessible except at the ends. Total length is about 20m. I have not found data on it but there is a 268-307-20 which is a single core 75 ohm coax and this one seems to have six of these, plus what looks like smaller (audio type) coaxes. It looks like a professional video cable. I ...


X-ray machine

Started by Anonymous in sci.electronics.design2 hours ago 33 replies

This counts parts, on reels, trays, or in tubes. https://www.dropbox.com/s/7dxshzvpv53y5c3/VisiCon.JPG?raw=1 Sadly, its resolution is...

This counts parts, on reels, trays, or in tubes. https://www.dropbox.com/s/7dxshzvpv53y5c3/VisiCon.JPG?raw=1 Sadly, its resolution is mediocre imaging a PC board. I wish I had something for small parts, wire-bond sort of resolution, but I wouldn't use it often enough to justify buying one. -- John Larkin Highland Technology, Inc lunatic fringe electronics


HV insulation test

Started by Winfield Hill in sci.electronics.design2 hours ago 26 replies

Panasonic ELF-21C0006A common-mode choke, with insulation rating 2kV / 1min. Has two windings on plastic bobbins, on opposite ferrite-core ...

Panasonic ELF-21C0006A common-mode choke, with insulation rating 2kV / 1min. Has two windings on plastic bobbins, on opposite ferrite-core legs. Digi-Key Part Number: PLK1296-ND https://www.dropbox.com/s/wybkrot1xz6s33a/ELF-21C023A.jpg?dl=1 Candidate for 1:1 HV transformer, with 5 to 10kV pri-sec insulation, after vacuum potting, with Dow Corning Sylgard 184, rated at 12kV/mm...


#Lying Bag Of Schiff

Started by amdx in sci.electronics.design3 hours ago 128 replies

That's all, feel free to use it.

That's all, feel free to use it.


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