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 III
John Curl's Blowtorch preamplifier part III
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 13th November 2019, 09:47 PM   #30611
Tournesol is offline Tournesol  Belgium
diyAudio Member
 
Tournesol's Avatar
 
Join Date: Sep 2017
Location: Château de Moulinsart
I am building a rocket in my garden, in order to board with some friends to the moon.
I take advantage of the presence of so many EE101 graduated experts here to ask 3 questions:

- What weld should I use for the components of my navigation system ?
(The round trip will only last a few days.)

- The presence of this layer of Rhodium under the thin layer of gold on my printed boards may-it affect the intelligibility of communications with the control room ?

- Is the presence of pieces of hair cut in 1000 likely to cause malfunctions with the connectors?
Attached Images
File Type: jpg fusée.jpg (50.2 KB, 269 views)
__________________
Yours faithfully,
Tryphon Tournesol

Last edited by Tournesol; 13th November 2019 at 09:53 PM.
  Reply With Quote
Old 13th November 2019, 09:50 PM   #30612
auplater is offline auplater  United States
diyAudio Member
 
auplater's Avatar
 
Join Date: Apr 2005
Location: KyOhWVa tristate
Default Rh

Quote:
Originally Posted by Chris Hornbeck View Post
What's the story on rhodium? It was all the rage in the 1990's.

Much thanks,
Chris
Rhodium... looks great on paper... ~ 1/2 the density of gold, platinum, iridium... one of the lighter noble metals, so when plated goes twice as far per unit area. Still very expensive, tho, often quite a bit higher than gold.

Way back in the 1960's Ted Kozul & Baytron set the standard for high quality commercial microwave waveguides, couplers, circulators, and such, made from silver with a rhodium flash to stop corrosion. These components are still being used around the world, and had a robust, almost gem like quality to them. Niche market.

Problem is, rhodium is difficult to dissolve in most anything, so producing and controlling a usable electrolyte to plate from is difficult. Because of its high cost, not much demand for coatings thicker than 1/4 micron or so exist (mainly jewelry as a coating over white gold) so low concentration flash coatings were about all that existed. Plus the baths tended to be unstable, and the coatings got rough and grainy at any appreciable thickness.

Bottom line, unless needed for hardness or appearance, gold deposition was / is cheaper, more versatile, and can be deposited with many different properties optimized for its use. The rhodium craze (in the audio industry) was a marketing tool to raise the sell point of whatever was being coated
__________________
"I've forgotten more than I care to remember" The Last Conspirators
  Reply With Quote
Old 13th November 2019, 10:45 PM   #30613
billshurv is offline billshurv  United Kingdom
diyAudio Member
 
billshurv's Avatar
 
Join Date: Mar 2014
John Curl's Blowtorch preamplifier part III
I'm sure I did see Osmium plated connectors once in the 80s but that may be memory playing tricks with me.



Back in the 90s there was a change in the plating of some RF connectors for low frequency (Coupla GHz levels). Silver plate was causing corrosion problems in the field and the iron content in some nickel plate was causing IMD issues. The suppliers came up with a new formulation with usual trade names but I think were related to the class of Cu-Sn-Zn plating that is often called white bronze and comes with some great names like 'Optalloy'. It was shiny, hard enough for our needs, corrosion resistant and gave the IMD performance we needed. Never seems to have done the crossover into audio. I guess because actual performance doesn't really matter
  Reply With Quote
Old 13th November 2019, 10:49 PM   #30614
scott wurcer is offline scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: Belmont MA
Quote:
Originally Posted by Tournesol View Post
I am building a rocket in my garden, in order to board with some friends to the moon.
If the moon is made of Wensleydale possibly mars is made of Red Leicester. Please tell us when you find out.
__________________
"The way up and the way down are one in the same"
  Reply With Quote
Old 13th November 2019, 10:53 PM   #30615
Bonsai is offline Bonsai  Europe
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Europe
Ahh Tin tin
  Reply With Quote
Old 13th November 2019, 11:31 PM   #30616
mchambin is offline mchambin  France
diyAudio Member
 
Join Date: Mar 2011
Rhodium plating: 1974.
I made a computer board pcb that had four 50 pins edge connectors.
Contacts had been rhodium plated.
This board implementing two high speed DMA channels was transferring digital pictures from a meteorology satellite. SMS ( Synchronous Meteorological Satellite ).
__________________
Transistor junction temperature is not transistor case temperature.
  Reply With Quote
Old 13th November 2019, 11:42 PM   #30617
Chris Hornbeck is offline Chris Hornbeck  United States
diyAudio Member
 
Chris Hornbeck's Avatar
 
Join Date: May 2011
Location: Little Rock
Quote:
Originally Posted by scott wurcer View Post
Please tell us when you find out.

Oh! The cat's eaten it.
__________________
"A marveilous newtrality have these things mathematicall and also a strange participation between things supernaturall, immortall, intellectuall, simple and indivisible, and things naturall, mortall, sensible, componded and divisible." - John Dee
  Reply With Quote
Old 14th November 2019, 10:09 AM   #30618
gpauk is offline gpauk  Scotland
diyAudio Member
 
gpauk's Avatar
 
Join Date: Mar 2016
Location: NE Scotland
Quote:
Originally Posted by Bonsai View Post
Ahh Tin tin
Is he RoHS compliant...?
  Reply With Quote
Old 14th November 2019, 10:49 AM   #30619
Tournesol is offline Tournesol  Belgium
diyAudio Member
 
Tournesol's Avatar
 
Join Date: Sep 2017
Location: Château de Moulinsart
Quote:
Originally Posted by gpauk View Post
Is he RoHS compliant...?
After 2 or 3 glasses of an old GLENDRONACH, everything is RoHS compliant.
Attached Images
File Type: jpg Tintin est avec les Écossais.jpg (138.1 KB, 172 views)
__________________
Yours faithfully,
Tryphon Tournesol
  Reply With Quote
Old 14th November 2019, 10:50 AM   #30620
mchambin is offline mchambin  France
diyAudio Member
 
Join Date: Mar 2011
lead free solder. Rohs compliance.
Tin Whiskers Are Real and Complex - Maxim
__________________
Transistor junction temperature is not transistor case temperature.
  Reply With Quote

Reply


John Curl's Blowtorch preamplifier part IIIHide 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 07:20 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki