Category: homebrew transistors

How to Homebrew your own Transistors

No store-bought transistors for these guys — they homebrew their own point contact transistors using a bit of Germanium from a diode. This makes me feel like such an appliance operator.

This video is in Polish, but The Knack is a universal language, and this guy obviously speaks it. Turn on captions, then opt for auto-translate to English. You will then get English subtitles and Bob will be your uncle.

I really liked this one. This fellow has obviously DONE this; his video is filled with both practical tips and theoretical explanations. He talks about the virtues of beeswax, and about how to borrow red nail polish to mark the collector lead. FB.


In their next episode they promise to build a radio receiver using the homebrew transistors. That’ll be great.

Thanks to Marcin and company, and to Jenny List of Hack-A-Day who alerted us to this.

But who is the fellow who built the homebrew transistor?

Homebrew Transistors

Hang your heads in shame, my friends. This dude is getting ready to homebrew his own transistors. None of that store-bought stuff for him. He is a few steps away from breaking free of the GLOBAL TRANSISTOR CARTEL that has been abusing us so-called “homebrewers” for so many years. This guy really puts the home in homebrew.

Plus he has a seriously cool shop enabling him to do some excellent metal and chemical work.

Thanks to Hackaday for alerting us to this.

Hack-a-Day: Has DIY become Click-and-Buy?

https://hackaday.com/2021/12/11/has-diy-become-click-and-buy/


Hack-A-Day today asks about the boundaries between DIY construction and the use of purchased, completed electronic components. This is closely related to our long-standing discussion of what really constitutes “homebrew.”


Is it really homebrew if you buy a bunch of already-stuffed PC boards and connect them together?

Is it really a homebrew receiver if 90% of the components are inside one chip?

Is it really homebrew if most of the signal processing is done in your computer (that you definitely did not build)?

The comments below the article are interesting. There we see some of the same arguments used by ham radio operators who are more inclined toward click-and-buy. They argue that since none of us are making our own resistors and transistors, we are ALL therefore click-and-buy people, so we should just get over it and pull out the credit cards. Some commenters carry this to extremes and ask if the real homebrewers are out there mining the copper for their wires.

The debate seems to spill over into the software area: One person asks if it is really DIY if you are using software libraries that contain code written by someone else. Or to be truly DIY should you write all of your own code in assembly language?

There is one very insightful comment about hams who are inclined to disparage the homebrewing that they did in their youth. We often hear this: “Oh, I used to build my own gear, but now-a-days I just buy commercial transceivers — they are so much better.” As if homebrewing was a folly of youth, something that they grew out of (and up from) as they became able to afford the latest ham radio appliances. As if homebreweing were a regrettable thing that was done only out of necessity. This is, I think, sad.

I think I’m a lot closer to the traditional concept of DIY than I am to click-and-buy. I still prefer LC oscillators to Si5351/Arduino combos. I prefer traditional filter rigs to SDR rigs. And I prefer to make my own crystal filters. I don’t like to use ICs unless I really understand what is going on inside them (so I can be comfortable with an NE602 or an LM386, but I’m not comfortable with a CPU chip that may have millions of transistors in it). But I am not homebrewing my own transistors nor am I mining copper.

What do you folks think about this?

Sam KD2ENL’s Homebrew Integrated Circuit Chips

Sam Zeloof KD2ENL does some really inspirational work on the homebrewing of IC chips. We first posted about this back in 2018, when Sam was 17:
Sam has some very impressive gear — I found myself wondering if that could really be a home lab. But it is. It is apparently in his garage in New Jersey. Hack-A-Day reports that Sam got a lot of the gear on e-bay. And they note that living near Princeton University (great dumpsters!) also helped. Here is some background on Sam’s workshop:
and

Sam and his brother Adam KD2MRG are students at Carnegie Mellon University in Pittsburgh.
Thanks to Hack-A-Day for alerting us to this:

Youngest Homebrew Hero: 17 year-old Sam Zeelof Makes His Own Integrated Circuits

Seventeen year-old Sam Zeelof, KD2ENL, is making his own integrated circuits in his garage.

Wow. This makes me think about another seventeen year-old — the fellow who appears on pages 63-64 of Cliff DeSoto’s “200 Meters and Down.” (I have the story on page 81 of “SolderSmoke — Global Adventures in Wireless Electronics.”) In the early days of radio that kid amazed us by making his own vacuum tubes. Sam Zeelof is clearly following in that tradition.

No “mysterious black boxes” for Sam! No “appliance chips” for him! FB OM.

This is really amazing. Here are the links:

https://spectrum.ieee.org/semiconductors/devices/the-high-school-student-whos-building-his-own-integrated-circuits


http://sam.zeloof.xyz/category/semiconductor/

One of Sam’s chips

Thanks to Bruce KC1FSZ for alerting us to this amazing work.

AMAZING 1999 Video on the Invention of the Transistor at “Hell’s Bells Laboratory”

Thanks to Armand WA1UQO for alerting me to this. I really liked the book — “Crystal Fire” — that this 1999 video is loosely based on. I’m also a fan of the narrator, Ira Flatow, whose melodious voice is heard each week on NPR’s excellent “Science Friday” radio show.

A few observations and thoughts on the video:

— I liked the irreverant Calypso song “Hell’s Bells Laboratory.” It looks like those folks had a lot of fun. And wow, Shockly’s secretary was named Betty Sparks. TRGHS.

— I have the same big Variac on my bench. And I have one of those “third hand” devices.

— I’d like to build my own replica of the point contact device with the triangular piece of lucite and the gold foil.

— While Shockley seems to be the real bad guy in this story (he seems to have all the bad characteristics of David Sarnoff, Lee DeForest, and Steve Jobs), I liked the his use of “physical intuition” to understand devices and the problems they were meant to solve.

— The image of the two Japanese founders of Sony working in the late 1940’s in a bombed out department store was very powerful.

— Although I came on the scence a bit later, I WAS one of those kids who used a transistor radio and an earphone to surreptitiously listen to rock-and-roll music.

— “More transistors are made each year than raindrops fall on California.” Hmmm….

More info here: http://www.pbs.org/transistor/
Extra interviews: http://www.pbs.org/transistor/tv/index.html

Who Invented the Transistor?

http://www.beatriceco.com/bti/porticus/bell/belllabs_transistor1.html

I dunno…. Roswell? Really? But I find myself attracted to anything that involves the use of iron pyrite and cats’ whiskers in radio. Mike, KL7R, sent me a bunch of fools gold from Alaska and it turned out to be better than galena as a detector.

Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Homebrew Transistors (video)

So you are using store-bought transistors eh? APPLIANCE OPERATOR!

Check out Jeri Ellsworth’s very impressive production of NMOS transistors.

Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Homebrew Transistors!

None of those store-bought parts for Jeri Ellsworth! Once again she makes us all look like a bunch of pathetic appliance operators. I like the “harvesting of Germanium” from a 1N34. And I found very interesting her comment about “early hobbyists” cracking open 1N34’s and turning them into transistors by adding phosphor-bronze collectors.

This all makes me want to fire up my Fool’s Gold crystal radio. WFAX is right down the road…

BTW: I’m very pleased to report that Jeri is currently reading “SolderSmoke — Global Adventures in Wireless Electronics.” I hope she likes it. She definitely has “The Knack.”

SolderSmoke Podcast 127 is almost ready.