Union Rectifier

[coldspot]

This came with the Jacobs 1800 Watt I got last weekend

[elvin1949]

Coldspot

 It just keeps getting better and better.

I don't think anyone else was keeping up with the other thread.

GUY'S

Check his file's.He got the whole system,up to and including the battery bank.[NiFe  so it should still be useable.

Getting greener by the min.

later

elvin

[willib]

yeah i didnt know that he got the jacobs!

if ya want to search the patent you could probably find a complete schematic.

Aug 23 1927, #1640335

[coldspot]

Guys

"Union Rectifier

A.C. Volts   110,   Cycles    50/60

Max D.C. Volts 13.5,  Max D.C. Amps  .90

Style  RST-11     PC.  219694

Spec.  3329

  Serial No.

    H60448  "

Looking a bit off by todays standards

I think

O-well

[willib]

Mr Grondahl ,the holder of the patent calls it a " unidirectional current carrying device "





selenium diodes were common before semiconductors

interesting

[willib]

 but expensive i'm sure

[drdongle]

These days we call it a "battery charger"

[jimjjnn]

Selenium rectifiers can be replaced with diodes or brdge rectifiers. Replace with higher voltage and higher current ones.

[coldspot]

jim-

Thanks

But this stuff is just

"Collecter" type

And I have way better

and modern systems.

I'm just sharing what

I find with the board.

LOL

PS: I'm not a collector type

just a good pack-rat type

LOL

[coldspot]

willib-

WOW

Nice pic

Thanks

Please-

If you could,

"Best" Inverter

"B32-3000"

I have factory sheets and sales booklet

from them but the NET seems to be lacking of any

info, in my limited searches so far.

This sucker is 75 Lbs 3K Watts with surge to 12K Watts!!!!!!!!!!

Even has a plug in for remote, lol

[jimjjnn]

12K !! use it !!!!!

[coldspot]

"use it !!!!!"

Without a dought!

As soon as I get a system that I can get to

the required in-put V.D.C.

"28 to 38"

I'm still on 12 V.DC here

Many, Many mini mills and NO place

to play with them.

Might get it tested later today-

[drdongle]

When replacing selenium rectifiers with silicon you should first check the current and possibly increase the series resistance. Seleniums have a higher series resistance than silicons. In the days of transition from vacuum tubes to solid state it was common to convert older power supplies to silicon.

[Ungrounded Lightning Rod]

selenium diodes were common before semiconductors

Selenium diodes ARE semiconductors.  B-)

(But they were in use before a theoretical explanation of how semiconductor diodes work was developed - an explanation that led immediately to the (re)invention of the point-contact junction transistor.)

[BT Humble]

Selenium diodes ARE semiconductors.  B-)

(But they were in use before a theoretical explanation of how semiconductor diodes work was developed - an explanation that led immediately to the (re)invention of the point-contact junction transistor.)

Re-invented you say?  So who was the poor devil who missed out on patenting it prior to Bardeen, Brattain & Shockley?  ;-)

BTH

[Ungrounded Lightning Rod]

It got patented but had long expired by the time that crew designed (not discovered) their transistor.

If you've ever tried positioning a cats-whisker on a piece of galina to make a diode for a crystal set, imagine positioning TWO of them correctly so the interaction makes a working point-contact transistor - and doing this half a dozen times -= with them ALL working - to get enough working stages of amplification to have an effective radio.

I think what happened is that the gain was too low and the construction too chancy, and people believed that it was bogus.

Remember that - except for perpetual motion machines (where they demand a working model as a way to keep the crackpots out of their hair) - the patent office is only concerned with novelty, not with whether the thing actually works.  (That's between the inventor and his licencees.)