The service manual for the first transistor radio.

Started by Michael A Terrell in sci.electronics.design4 years ago 9 replies

It is also likely the first all semiconductor consumer, active electronics product sold. Let's see the peanut gallery tell us why the...

It is also likely the first all semiconductor consumer, active electronics product sold. Let's see the peanut gallery tell us why the design was oh, so wrong.


electron brainsprain

Started by Wond in sci.electronics.design5 years ago 60 replies

I'm past my best-before date, and keeping up is more work, but this tripped me: about a transistor with a 1 nanometer gate. ...

I'm past my best-before date, and keeping up is more work, but this tripped me: about a transistor with a 1 nanometer gate. Electrons in different materials have different masses? When did we discover this?


first production transistor

Started by Tom Del Rosso in sci.electronics.design10 years ago 40 replies

FETs were theorized in 1924, and BJT was prototyped in 1948. But when was the first FET prototype, and the the first production units of...

FETs were theorized in 1924, and BJT was prototyped in 1948. But when was the first FET prototype, and the the first production units of either? -- Reply in group, but if emailing add one more zero, and remove the last word.


Boost Dieing AA

Started by BeeJ in sci.electronics.design9 years ago 7 replies

Looking for that circuit that boosts very low voltages, around 0.3VDC, up to 3 to 5 VDC. The circuit used a germanium transistor in an...

Looking for that circuit that boosts very low voltages, around 0.3VDC, up to 3 to 5 VDC. The circuit used a germanium transistor in an oscillator configuration to do it. Anybody know where to find the circuit?


Oscillator type names.

Started by Ian Field in sci.electronics.design6 years ago 19 replies

Does anyone know the correct name for the 2 transistor LC oscillator that looks like a long tailed pair? I though it was a Franklin...

Does anyone know the correct name for the 2 transistor LC oscillator that looks like a long tailed pair? I though it was a Franklin oscillator - the google hits are ambiguous to say the least, but its possible I have the name wrong. Thanks for any help.


Unijunction transistor LED flasher

Started by Jan Panteltje in sci.electronics.design8 years ago 31 replies

Just build one: http://youtu.be/LR7IKp2Cpkw | [ ]

Just build one: http://youtu.be/LR7IKp2Cpkw | [ ]


Just a little simple project

Started by Tim Williams in sci.electronics.design7 years ago 11 replies

http://seventransistorlabs.com/Fuse/index.html Tim -- Seven Transistor Labs Electrical Engineering Consultation Website:...

http://seventransistorlabs.com/Fuse/index.html Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com


That thread about ferrite rods

Started by Tim Williams in sci.electronics.design8 years ago 3 replies

Just ran across; http://www.neazoi.gr/ferite_rodsQEX%202008-07-08.pdf This might be closer to the article some were thinking of. Tim --...

Just ran across; http://www.neazoi.gr/ferite_rodsQEX%202008-07-08.pdf This might be closer to the article some were thinking of. Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com


Confocal microscope teardown

Started by Tim Williams in sci.electronics.design6 years ago 1 reply

https://www.youtube.com/watch?v=jaM9_JVnWQE Lots of optical bits, might be of interest to residents :) More to come soon, it...

https://www.youtube.com/watch?v=jaM9_JVnWQE Lots of optical bits, might be of interest to residents :) More to come soon, it seems. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com


Get some perspective. We're FINished.

Started by DecadentLinuxUserNumeroUno in sci.electronics.design7 years ago 7 replies

Hehehe... Not an obscure reference at all! One of the simplest explanations of the basic operation of a transistor I have ever seen,...

Hehehe... Not an obscure reference at all! One of the simplest explanations of the basic operation of a transistor I have ever seen, however. http://www.intel.com/content/www/us/en/silicon-innovations/standards-22nm-explained-video.html BRL!!


Bistability

Started by Tim Williams in sci.electronics.design6 years ago 2 replies

It's an older article, but relevant to present...

It's an older article, but relevant to present conversations: https://gravityandlevity.wordpress.com/2010/04/07/the-global-temperature-is-inherently-unstable/ Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com


Correlations

Started by Tim Williams in sci.electronics.design3 years ago 2 replies

Seen on a forum (slightly corrected): "Unfortunately, we have no control over the source of interference, which has been a source of...

Seen on a forum (slightly corrected): "Unfortunately, we have no control over the source of interference, which has been a source of uncorrelated noise, and correlated pain." Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/


DAC1209 error; charge injection?

Started by Tim Williams in sci.electronics.design2 years ago 4 replies

Anyone seen this before? Seems like I'm getting a huge spike (relatively speaking -- about 3 LSB) when flipping bit 11 (going from > = 0x800 to

Anyone seen this before? Seems like I'm getting a huge spike (relatively speaking -- about 3 LSB) when flipping bit 11 (going from > = 0x800 to


LDC for Dummies? (I dont get how they work)

Started by Anonymous in sci.electronics.design9 years ago 11 replies

It seems the older I get th further away I become from technology. Sometimes I think we're locked into the generation in which we became...

It seems the older I get th further away I become from technology. Sometimes I think we're locked into the generation in which we became a legal adult. In my case, that would be the late 1960s. Give me an old tube device and I can make it do most anything. The early transistor devices came pretty naturally too, but getting into some of the later devices with chips, some things became ...


2N4261 modern days replacement

Started by Sergey Kubushyn in sci.electronics.design8 years ago 13 replies

Can anybody point to something available now to replace 2N4261 transistor? It will be used in its primary role, as fast...

Can anybody point to something available now to replace 2N4261 transistor? It will be used in its primary role, as fast switcher. --- ****************************************************************** * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *********************************************************


A SOT-89 with emitter in the middle

Started by LM in sci.electronics.design4 years ago 36 replies

Has anyone seen a NPN bipolar transistor with emitter in the middle, tab. Emitter is easier to ground in RF amplifiers.

Has anyone seen a NPN bipolar transistor with emitter in the middle, tab. Emitter is easier to ground in RF amplifiers.


(On Topic) Work of Art

Started by Tim Williams in sci.electronics.design7 years ago 19 replies

http://seventransistorlabs.com/Monitor/index.html Love those Trinitron monitors. Great design throughout. Tim -- Seven Transistor...

http://seventransistorlabs.com/Monitor/index.html Love those Trinitron monitors. Great design throughout. Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com


MOSFET SOA

Started by Tim Williams in sci.electronics.design8 years ago 4 replies

Have manufacturers eliminated DC SOA? Even from old devices? Can the old curves still be trusted, or are all new production actually...

Have manufacturers eliminated DC SOA? Even from old devices? Can the old curves still be trusted, or are all new production actually broken? Example: compare IRF830, ST's '99 datasheet versus current Vishay docs. Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com


Inductor coupling

Started by Tim Williams in sci.electronics.design7 years ago 6 replies

This topic popped up a while ago; ran across this page with some numbers for typical spacings and...

This topic popped up a while ago; ran across this page with some numbers for typical spacings and geometry: http://www.w0qe.com/Technical_Topics/coupling_between_coils.html Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com


A resistor network with a curious property

Started by Tim Williams in sci.electronics.design5 years ago 42 replies

https://www.seventransistorlabs.com/Images/DistAttenuator.png Solved by minimization... should like to come up with the equation that...

https://www.seventransistorlabs.com/Images/DistAttenuator.png Solved by minimization... should like to come up with the equation that generates it, though. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com