- Crazy idea? - 5 Updates
- Pinout for digital ic CD74C4511 - 1 Update
| bruce2bowser@gmail.com: May 10 07:04PM -0700 > No reverse on the PTO. You have to take the bolts out and unscrew the > augur using a big wrench. That's how it was done in 1939 on > inexpensive tractors. Were transistors or semi-conductors also around back then? Incidentally, I know little about science, math and technology, so you know: I'm just curious. |
| Fox's Mercantile <jdangus@att.net>: May 10 10:19PM -0500 > Were transistors or semi-conductors also around back then? In 1939? No. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| Michael Terrell <terrell.michael.a@gmail.com>: May 11 12:15AM -0700 > Were transistors or semi-conductors also around back then? Incidentally, I know little about science, math and technology, so you know: I'm just curious. Yes: Diodes were the first semiconductor electronic devices. The discovery of crystals' rectifying abilities was made by German physicist Ferdinand Braun in 1874. The first semiconductor diodes, called cat's whisker diodes were made of crystals of minerals such as galena. |
| Fox's Mercantile <jdangus@att.net>: May 11 05:52AM -0500 On 5/11/19 2:15 AM, Michael Terrell wrote: >> Were transistors or semi-conductors also around back then? Incidentally, I know little about science, math and technology, so you know: I'm just curious. > Yes: > Diodes were the first semiconductor electronic devices. The discovery of crystals' rectifying abilities was made by German physicist Ferdinand Braun in 1874. The first semiconductor diodes, called cat's whisker diodes were made of crystals of minerals such as galena. An accurate, but totally useless answer that you cut and pasted from: <http://www.idc-online.com/technical_references/pdfs/electronic_engineering/History_of_diode.pdf> Transistors weren't invented until 1947. Generators were in use until the '60s, and mechanical regulators were in use up to the 70's because prior to that they didn't have reliable diodes and transistors. So I repeat, in 1939, no. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| Roger Blake <rogblake@iname.invalid>: May 11 02:37PM > Generators were in use until the '60s, and mechanical regulators were > in use up to the 70's because prior to that they didn't have reliable > diodes and transistors. In cars, Rambler had alternators with solid-state voltage regulators starting with the 1964 models. (It was a Motorola system.) -- ----------------------------------------------------------------------------- Roger Blake (Posts from Google Groups killfiled due to excess spam.) NSA sedition and treason -- http://www.DeathToNSAthugs.com Don't talk to cops! -- http://www.DontTalkToCops.com Badges don't grant extra rights -- http://www.CopBlock.org ----------------------------------------------------------------------------- |
| fynnashba@gmail.com: May 10 01:50PM -0700 On Thursday, May 2, 2019 at 9:16:09 AM UTC+1, Jim Whitby wrote: > > CD74C4511. > > Thanks. > https://octopart.com/cd74hc4511-texas+instruments-7113718 Thank you very much |
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