Oscillators without transistors

Started by Anonymous in sci.electronics.basics1 hour ago 11 replies

Hello, What are some examples of oscillators which don't require transistors or vacuum tubes? So far I found relay oscillators and the...

Hello, What are some examples of oscillators which don't require transistors or vacuum tubes? So far I found relay oscillators and the Pearson-Anson oscillator. Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well? https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect Relay oscillators look neat too but I don't imagine they would la...


Tube amp question

Started by Anonymous in sci.electronics.basics15 hours ago 10 replies

I see lots of tube amps with the tubes mounted such that they point down. This means all the heat rises up into the chassis. This...

I see lots of tube amps with the tubes mounted such that they point down. This means all the heat rises up into the chassis. This seems counter-intuitive to me. All those components baking all the time. Is it just for convenience? Eric


Single phase VFD-nevermind

Started by Anonymous in sci.electronics.basics2 weeks ago 9 replies

Last time I looked, which was several years ago and for a different reason, I found nothing. Today I found them and they are cheap. I shoulda...

Last time I looked, which was several years ago and for a different reason, I found nothing. Today I found them and they are cheap. I shoulda looked before posting. Sorry, Eric


The Tesla Spirit Radio - Full Spirit Communication Test

Started by Mr. Man-wai Chang in sci.electronics.basics2 weeks ago 6 replies

The Tesla Spirit Radio - Full Spirit Communication Test -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! ...

The Tesla Spirit Radio - Full Spirit Communication Test -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! / v \ Simplicity is Beauty! /( _ )\ May the Force and farces be with you! ^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3 ???! ???! ???! ???! ???! ???! ???! ???!


x100 'scope probe

Started by George Herold in sci.electronics.basics2 weeks ago 18 replies

I was thinking of making a DC (slow) x100 'scope probe by adding a series 100 meg ohm resistor. Any thing I should look out for? George H.

I was thinking of making a DC (slow) x100 'scope probe by adding a series 100 meg ohm resistor. Any thing I should look out for? George H.


Millman - Microelectronics digital and analog circuits and systems by Thomas V. Papathomas

Started by Anonymous in sci.electronics.basics3 weeks ago

solutions.for.student@hotmail.com s o l u t i o n s . f o r . s t u d e n t @ h o t m a i l . c o m...

solutions.for.student@hotmail.com s o l u t i o n s . f o r . s t u d e n t @ h o t m a i l . c o m solutions(dot)for(dot)student(at)hotmail.com We're a team found for providing solution manuals to help students in their study. We sell the books in a soft copy, PDF format. We will do our best to find any book or solution manual for you. Before purchase, we


VFD for single phase induction motor?

Started by Anonymous in sci.electronics.basics3 weeks ago 2 replies

Is this possible? I have a customer, a glass artist, who uses several very nice but old glass grinding machines. There are only 4 speeds...

Is this possible? I have a customer, a glass artist, who uses several very nice but old glass grinding machines. There are only 4 speeds on these machines and he would really like more speeds. He has a newer machine with a VFD on it and asked me how he could get the same thing on his old machines. I told him he really needs to change motors to 3 phase. But he is loathe to do that. I can see w...


mechanics of materials james gere 5th edition

Started by Anonymous in sci.electronics.basics3 weeks ago

solutions.for.student@hotmail.com s o l u t i o n s . f o r . s t u d e n t @ h o t m a i l . c o m...

solutions.for.student@hotmail.com s o l u t i o n s . f o r . s t u d e n t @ h o t m a i l . c o m solutions(dot)for(dot)student(at)hotmail.com We're a team found for providing solution manuals to help students in their study. We sell the books in a soft copy, PDF format. We will do our best to find any book or solution manual for you. Before purchase, we


Mechanics of Fluids , By Victor Streeter , 9th ed

Started by Anonymous in sci.electronics.basics3 weeks ago

solutions book team s o l u t i o n s m a n u a l t e a m @ h o t m a i l . c o m solutionsmanualteam(at)hotmail(dot)com...

solutions book team s o l u t i o n s m a n u a l t e a m @ h o t m a i l . c o m solutionsmanualteam(at)hotmail(dot)com solutionsmanualteam@hotmail.com We're a team for providing solution manuals to help students in their study. We sell the books in a soft copy, PDF format. We will find any book or solution manual for you. Just email us: s o l u t i o n s


Transformerless Power Supply

Started by amdx in sci.electronics.basics4 weeks ago 10 replies

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus...

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus depending on other components. Maybe 9- 20uf caps in parallel? I'd like to build it into a leaf blower. All plastic, absolutely no metal exposed. I think I've answered my question, I have 12, X rated caps in my junk box, but they are only...


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