Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

To good to be true?
To good to be true?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 1st May 2004, 08:09 PM   #21
gwolf is offline gwolf  Austria
diyAudio Member
gwolf's Avatar
Join Date: Mar 2003
Location: Graz
Last year I have posted a shunt regulator design using positive feedback error correction:


But it needs more than 2 transistors ...


  Reply With Quote
Old 1st May 2004, 09:21 PM   #22
destroyer X is offline destroyer X  Brazil
diyAudio Member
destroyer X's Avatar
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Hello Elso, also boholm and all others

I know this is not only 2 transistors..... each side at leat tree...but, as i am using 33 years long, and i construct more than a hundred to friends use their 20 Amperes consumption SSB Radio Transmitters (consumption moves from miliamperes to 20 amperes in a matter of some microseconds) that i decided to show you.

A lot off supplies is almost this one.... the difference is that one is tested a lot, long time testing... some users died and his son is melting strong wires only to joke.... only to see it melt making output short circuit.

Do not answer your question.... but i send it to say you hello... also boholm and other friends.


Attached Images
File Type: jpg simétrica.jpg (33.8 KB, 355 views)
Restriction removed ; ttps://www.youtube.com/watch?v=3ioyOjAzDt0; https://www.youtube.com/watch?v=uFcnddpe3MU
  Reply With Quote
Old 1st May 2004, 10:40 PM   #23
john curl is offline john curl  United States
diyAudio Member
john curl's Avatar
Join Date: Jul 2003
Location: berkeley ca
This last schematic is representative of what a '2 transistor' regulator would normally look like. This was the original design for dc regulators in the '50's and '60's. Many early transistor design textbooks have this model.
  Reply With Quote
Old 1st May 2004, 11:06 PM   #24
johnnyx is offline johnnyx  United Kingdom
diyAudio Member
Join Date: Jan 2004
Location: manchester
One of the transistors could be used as a zener, the reverse breakdown voltage of the base - emitter junction is about 6 to 7 volts. If the current is limited to a few mA, then it can be used as a zener substitute. (this is why the max voltage for TTL is specified as 6V, and why the max reverse VBE is 5V in most transistor data sheets.)
It's a noisy one though, I've seen it used as a white noise source, compared to a band - gap reference. Just like all zeners above about 5V, they are really "avalanche breakdowns", and this is a noisy process.
  Reply With Quote


To good to be true?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
QB5 sub, too good to be true? Pashley Subwoofers 18 7th December 2014 12:57 PM
Single Tube RIAA preamp too good to be true? alexmoose Tubes / Valves 16 22nd October 2007 08:09 PM
True-RMS? star882 Parts 8 1st June 2007 02:35 AM
Is it true? rick57 Digital Source 4 31st October 2006 08:50 AM

New To Site? Need Help?

All times are GMT. The time now is 03:52 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio