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

The Lounge A place to talk about almost anything but politics and religion.

John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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
Reply
 
Thread Tools Search this Thread
Old 21st March 2013, 09:37 PM   #37061
jneutron is offline jneutron  United States
diyAudio Member
 
jneutron's Avatar
 
Join Date: Jan 2004
Location: away
Quote:
Originally Posted by simon7000 View Post
Well back to audio.

Attached is my 50 ohm load from a CT 24V transformer. I used four 4700 uF capacitors and three 1 ohm resistors. It went from all the capacitors in parallel to a four stage CRCRCRC filter. As a CRCRC filter it did not seem to matter where the 9400 uF was positioned. Of course the four stage filter was the best. Total voltage loss was 6%. So the conclusion seems to be calculated what the worst case into the filter will be and the minimum you need out of it and use a three or four stage filter that uses up the voltage.

ES
Ed, what are you looking at? Filtered out dc with one diode? What schematic?

jn
  Reply With Quote
Old 21st March 2013, 09:39 PM   #37062
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by jneutron View Post
didn't notice
If there's no sensitory difference, summer or winter, means 100% success score of the repair job.
Nerves are not single solid core, but strands. Bigger the function, the more strands.
The lower the function, fewer strands, higher chance of conductivity issues, and/or under/over-sensitivity.
Double or nothing is my middle name.

(I read latin, but from a different bible)
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 21st March 2013, 09:49 PM   #37063
simon7000 is offline simon7000  United States
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
2 Diodes, CT grounded. Capacitor and series resistors are the variable. Output is across the 50 ohm load resistor. 0dB is 1 VRMS.
  Reply With Quote
Old 21st March 2013, 09:58 PM   #37064
jneutron is offline jneutron  United States
diyAudio Member
 
jneutron's Avatar
 
Join Date: Jan 2004
Location: away
Quote:
Originally Posted by jacco vermeulen View Post
If there's no sensitory difference, summer or winter, means 100% success score of the repair job.
Nerves are not single solid core, but strands. Bigger the function, the more strands.
The lower the function, fewer strands, higher chance of conductivity issues, and/or under/over-sensitivity.
Double or nothing is my middle name.

(I read latin, but from a different bible)
Ah. So if there's high conductivity, then maybe I'm suffering skin effect???

Seriously, thanks for the info..really appreciate it.


Quote:
Originally Posted by simon7000 View Post
2 Diodes, CT grounded. Capacitor and series resistors are the variable. Output is across the 50 ohm load resistor. 0dB is 1 VRMS.
Did you match the diodes? There's an awful lot of 60 and odds there..

What speed are the diodes?

jn
  Reply With Quote
Old 21st March 2013, 10:11 PM   #37065
simon7000 is offline simon7000  United States
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
Quote:
Originally Posted by jneutron View Post
.




Did you match the diodes? There's an awful lot of 60 and odds there..

What speed are the diodes?

jn
The pictures shown are with something fancy, (http://www.mouser.com/ds/2/389/CD00050205-112771.pdf) pretty much the same with GI 1N4004 and a few others. The 60 hz is from the transformer unbalance. It is a Signal flat pack, the worst of the bunch.
  Reply With Quote
Old 21st March 2013, 10:42 PM   #37066
wrinkle is offline wrinkle  United Kingdom
diyAudio Member
 
Join Date: May 2010
Quote:
Originally Posted by jneutron View Post
Sounds dangerous to me. Looks like I'm gonna need a chemist to explain all these compounds to me so I don't kill mself.

Where the heck am I gonna find a chemist around here???

specially an OLD one..

jn

ps..my favorite beverage name in Beijing was "40 degree"
those look like coal tar dyes to me, most of them will also have E-numbers too...
  Reply With Quote
Old 21st March 2013, 11:19 PM   #37067
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by jneutron View Post
So if there's high conductivity, then maybe I'm suffering skin effect
Exactly.
Amusing about human skin, by putting heat in, the conductivity level can be lowered : http://www.diyaudio.com/forums/loung...ml#post2716746
Reverse of an HF-field on the physical analogy.

(if only electronics had external adjustable sensors of such simple nature)
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 22nd March 2013, 12:12 AM   #37068
Max Headroom is offline Max Headroom  Australia
diyAudio Member
 
Max Headroom's Avatar
 
Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
Default Clock Makers Tool Kit ?...

Click the image to open in full size.
Henry Studley's Tool Chest. - Neatorama
Dan.
  Reply With Quote
Old 22nd March 2013, 12:23 AM   #37069
scott wurcer is offline scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: dorchester ma
Quote:
Originally Posted by wrinkle View Post
those look like coal tar dyes to me, most of them will also have E-numbers too...
Restoration of art is exempt from some of the rules, OTOH some artists are extremists and order lead. mercury, etc. based materials for new works. Caveat emptor.
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
  Reply With Quote
Old 22nd March 2013, 01:50 AM   #37070
Kindhornman is offline Kindhornman  United States
diyAudio Member
 
Kindhornman's Avatar
 
Join Date: Aug 2012
Location: Los Angeles, California
John Curl's Blowtorch preamplifier part II
Scott,
You mean you don't break a thermometer open just so you can roll the mercury around in your hands, and don't fix all the dents on your car with lead? Where is the fun in that....... Next thing your going to say is you don't even put solder in your mouth to hold it while you work.....
  Reply With Quote

Reply


John Curl's Blowtorch preamplifier part IIHide 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


New To Site? Need Help?

All times are GMT. The time now is 01:59 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki