Search found 45 matches

by solar3000
Mon Jan 01, 2018 6:02 pm
Forum: General Discussion
Topic: really old 4700uF capacitors
Replies: 9
Views: 2540

Re: really old 4700uF capacitors

thanks
by solar3000
Sun Dec 31, 2017 9:56 am
Forum: General Discussion
Topic: really old 4700uF capacitors
Replies: 9
Views: 2540

really old 4700uF capacitors

I found a case of common electrolytic capacitors that I left unused for 30 years. Seems to still work. I found one that heats up. But the rest seem to still work. I'm reading about how capacitors have a shelf life of 3 years. How can this be? https://www.google.com/search?source=hp&ei=3yFJWqroN6nEjw...
by solar3000
Sat Dec 09, 2017 10:57 pm
Forum: General Discussion
Topic: unmarked transformer
Replies: 8
Views: 2482

Re: unmarked transformer

Thanks again all.
by solar3000
Mon Dec 04, 2017 6:16 pm
Forum: General Discussion
Topic: unmarked transformer
Replies: 8
Views: 2482

Re: unmarked transformer

OK. Thanks everyone.
I will test them.
I'm likely only going to use the 24/25.2 volts.
by solar3000
Sat Dec 02, 2017 5:23 pm
Forum: General Discussion
Topic: unmarked transformer
Replies: 8
Views: 2482

Re: unmarked transformer

You're right.

The red-black-red are 12-12 v.
The two blue wires measure 4.9 volts.

So you think they are two independent coils?
Will the two coils affect each other?

Will it not be 12-12-5 volts?
by solar3000
Fri Dec 01, 2017 5:08 pm
Forum: General Discussion
Topic: unmarked transformer
Replies: 8
Views: 2482

unmarked transformer

I'm trying to reuse an unmarked transformer. It comes from an EMCO PSR-7 from 1993. I dug it out of the dust from a pile. The transformer has on one side black and white wires for primary. And on the secondary, on top are wires: red-red-black. That measures 24 volts. On the secondary, on the bottom ...
by solar3000
Sun Nov 26, 2017 6:34 pm
Forum: General Discussion
Topic: LM1084 input voltage
Replies: 2
Views: 1243

LM1084 input voltage

I have a chip that says LM1084. Not sure which version it is. I know there are 3.3, 5, 12, and adjustable voltage. Specs say the input max voltage is 29 volts. I am using a 25.2 volt AC transformer. Passing the secondary through a bridge rectifier and then a large capacitor ( 63 volts, 470uF electro...
by solar3000
Wed May 17, 2017 6:05 pm
Forum: General Discussion
Topic: CFL vs. LED Light Bulbs
Replies: 15
Views: 4078

Re: CFL vs. LED Light Bulbs

super duper bright leds sells LEDs by color. Natural white is easier on your eyes and its white enough. Warm white emulates Edison bulbs. Cool white is what you are thinking. its a little on the blue side. That looks the brightest, but its also a little bit uncomfortable for some people. In the bath...
by solar3000
Tue Jan 10, 2017 10:13 pm
Forum: General Discussion
Topic: 120v to 4800 v transformer
Replies: 14
Views: 3879

Re: 120v to 4800 v transformer

umm...yah, I wrote those numbers when I was 19 years old....that was over 25 years ago... Anyway, again, I got it at some junky shop that sold old electronics. But it was 10ma somewhere. I have small children who are interested in the glowing florescence lamps. Maybe I'll propel something with the h...
by solar3000
Mon Jan 09, 2017 5:09 pm
Forum: General Discussion
Topic: 120v to 4800 v transformer
Replies: 14
Views: 3879

Re: 120v to 4800 v transformer

I live in a crowded urban area in NJ, so not a lot of bugs to massacre.
Well, it causes a florescence lamp to glow when near the transformer.

Do you think the 10mA is rating for the 4.8kv winding or the 120v winding?
by solar3000
Mon Jan 09, 2017 5:05 pm
Forum: General Discussion
Topic: 120v to 4800 v transformer
Replies: 14
Views: 3879

Re: 120v to 4800 v transformer

most likely it is not a MOT, as 10Ma. is nothing.. most likely it is a transformer used in a bug zapper,, i have come across many of them at that voltage and Ma. range.. i have some 5ft tall commercial bug zappers made by Flintrol, had 4ft black lights in them. usually either the ballast or zapping...
by solar3000
Mon Jan 09, 2017 5:00 pm
Forum: General Discussion
Topic: Raspberry Starter Kit with Projects
Replies: 3
Views: 1619

Re: Raspberry Starter Kit with Projects

To the OP: I've started my own research and I've found there is no shortage of projects on the web, a simple search of Raspberry Pi projects turns up several good websites. In particular, start here https://www.raspberrypi.org/help/ I don't think you will need a physical "BOOK" as the web is overfl...
by solar3000
Sun Jan 08, 2017 9:10 pm
Forum: General Discussion
Topic: 120v to 4800 v transformer
Replies: 14
Views: 3879

Re: 120v to 4800 v transformer

Here's the transformer.
It has four wires. Two and two.
by solar3000
Sun Jan 08, 2017 5:21 pm
Forum: General Discussion
Topic: Raspberry Starter Kit with Projects
Replies: 3
Views: 1619

Re: Raspberry Starter Kit with Projects

Why? They include junk you don't need. If you must, you can pick up any one at micro center if you live near one. MCM sells nice ones at a reasonable price. I'll create a kit for you. Buy the board. Buy also: * any cheap micro SD card 16 or 32GB is more than enough * any cheap case for a few dollars...
by solar3000
Sun Jan 08, 2017 4:44 pm
Forum: General Discussion
Topic: 120v to 4800 v transformer
Replies: 14
Views: 3879

120v to 4800 v transformer

What do I do with a used 120 V to 4800 V transformer from 1994??? I found an old transformer I picked up in 1994 at a junk shop. It was already used 22 years ago. It was taken out of junked equipment. I don't know what it was taken out of. Its specs: * 120V primary, 10mA * other end is 4800 volts * ...