Crazy idea?

Google is your friend....Google knows all...(more or less, a little fuzzy around the edges sometimes, but mostly in the ballpark..)

Semiconductor transistors? No, not in 1939. 1946, 1947 depending on what you want to call invented? - actual semiconductor effect? patented? demonstrated? Dec 23, 1947 is the most cited date. IIRC there was about 6-10 months from the time the actual device worked in the lab till when it was announced to the world (Dec 1947) Actually the field effect transistor was discovered in 1925. A vacuum tube (valve) diode was invented in 1904, semiconductor version was developed in the early 40's.

Silicon crystals that exhibited the 'diode effect' were used in the 1920,1930 as detectors in the crystal radios.

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Reply to
jjhudak4
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ly, I know little about science, math and technology, so you know: I'm just curious.

f crystals' rectifying abilities was made by German physicist Ferdinand Bra un in 1874. The first semiconductor diodes, called cat's whisker diodes wer e made of crystals of minerals such as galena.

No, I have never been to that site, but nice try, Skippy!

It came from here:

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Repeat it all you want. Bipolars were developed in the '40s, but Field Effe ct were much earlier. They were unable to manufacture them, until the metal urgy improved to an acceptable level to do more that create single FETs in the lab.

Reply to
Michael Terrell

So what, it was still word for word verbatim copy and past

Blather all you want about lab curiosities.

His question, and the answer, were with regards to solid state devices used in production on 1939 tractors.

There weren't any. So unless you can prove otherwise, go f*ck yourself.

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"I am a river to my people." 
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Reply to
Fox's Mercantile

Yet another lame cut & paste insult that only you lying, brain dead liberals can do, Skippy?

Reply to
Michael Terrell

Congratulations, you've proved my point.

--
"I am a river to my people." 
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Reply to
Fox's Mercantile

I think the OP was asking a simple question about powering the 12 v clutch using the 6 volt supply from the tractor AND a 6 volt battery in SERIES.

YES, that will work fine.

If you want to get fancy you can hook up a DPDT switch so the 6 V battery is charged by the tractor when the battery is not being used to power the clutch.

mark

Reply to
makolber

That's what I wrongly assumed to begin with. What he wanted to do is switch the 6 v generator in series with the battery to total 12 volts.

In retrospect, this is a problem as one side of the generator is grounded. Kind of hard to float it in series.

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"I am a river to my people." 
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Reply to
Fox's Mercantile

Actually I was thinking of using the tractor generator is series with the existing tractor battey, not an extra battery. Eric

Reply to
etpm

ok, that would be a bit more complicated and risky.

m
Reply to
makolber

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