F5 power amplifier - Page 90 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 27th May 2008, 04:45 PM   #891
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
You can do that, no changes. Just drive each input with the
opposite polarity of the same signal.
  Reply With Quote
Old 27th May 2008, 05:16 PM   #892
Variac is offline Variac  United States
diyAudio Editor
 
Variac's Avatar
 
Join Date: Dec 2001
Location: San Francisco, USA
Quote:
What type of water proof marker should I use, not a Shapie permanent marker I suppose?
I believe that a Sharpie type marker is exactly what they use..

After, you scrub it off using I dunno - laquer thinnner?
  Reply With Quote
Old 27th May 2008, 05:42 PM   #893
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
I use any black-color oil paint.
I use the toothpick for the drawing.
Finally, I rub off the paint, using a hard luffa...
  Reply With Quote
Old 27th May 2008, 06:01 PM   #894
diyAudio Member
 
sandstorm33's Avatar
 
Join Date: Sep 2006
Quote:
Originally posted by Variac


I believe that a Sharpie type marker is exactly what they use..

After, you scrub it off using I dunno - laquer thinnner?
Sharpie works fine. Clean the board with a brillo pad and then use a degreaser . Draw your pattern with the sharpie and etch with 2 parts peroxide and 1 part muriatic. Be careful with the mixture ..I do the etching outdoors. When etch is complete wash board well and drill holes. Then I coat the traces with flux from flux pen from mouser and let flux dry. Then I flow solder on the traces.

I have also drilled holes first but that requires laying traces out twice.

The reason for flux solder treatment is to cover pinholes after etch. The sharpie is not the greatest mask. You might do better with Babo's oil paint .I imagine a tube of artist's oil would do the job.
  Reply With Quote
Old 27th May 2008, 06:03 PM   #895
diyAudio Member
 
sandstorm33's Avatar
 
Join Date: Sep 2006
Forgot the after etch brillo pad to remove sharpie ink.
  Reply With Quote
Old 27th May 2008, 06:04 PM   #896
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by sandstorm33
I imagine a tube of artist's oil would do the job.
"We take our obsolete technologies and turn them into art"

- Marshall McLuhan
  Reply With Quote
Old 27th May 2008, 06:16 PM   #897
Goffe is offline Goffe  Sweden
diyAudio Member
 
Join Date: Aug 2003
Location: Sweden/Thailand
I made some changes, the J-fets are together and the feedback resistors closer. Dimension 10x3.8cm

Any advice please?

/Goffe
Attached Images
File Type: png f5_display.png (32.9 KB, 1891 views)
  Reply With Quote
Old 27th May 2008, 06:45 PM   #898
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Default Home-made PCBs

Guys, this is how I do it:
- You print on paper the published picture (it's a bottom view of the PCB - take care with dimensions)
- Scotch tape the piece of paper over the cleaned copper surface
- Drill the holes
- Clean it again (acetone, nail polish remover...)
- Use the water-resistant permanent marker (Staedtler, Faber-Castel...), with a, preferably, hard tip sized 1 mm or smaller to draw the traces exactly like they are on the paper you used for drilling
- Now you etch it like described ( H2O2 + HCl )
- Clean the marker traces with acetone
- Cover the copper traces with non-acid soldering grease (that's the name used here - I don't know the name of US equivalent - it's a greasy substance that makes soldering easier and quicker)
- Use a small quantity of soldering tin to cover the traces
- Clean the grease (alcohol, acetone, dish-washing detergent...)
Your PCB is ready. The success mainly depends on how clean the copper is before the drawing - don't touch it with your fingers.
One more thing: No brillo-pads or similar stuff - no abrasive materials - we don't want to mechanically hurt the copper traces. Acetone on cotton-ball and detergent on soft sponge will do the cleaning perfectly.
  Reply With Quote
Old 27th May 2008, 08:58 PM   #899
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Who mentioned tweaking R1/2 ? -
  Reply With Quote
Old 27th May 2008, 09:01 PM   #900
diyAudio Member
 
Join Date: Nov 2002
Location: Cologne, Germany
Quote:
Originally posted by Nelson Pass
You can do that, no changes. Just drive each input with the
opposite polarity of the same signal.

Thanks, Nelson, I will start the work immediately, last question: is the heat dissipation similar to the F4 or much lower or much more ?

So, could I get two F5 (so four channels) into a case which would require normally one F4 (two channels)...?
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rockford Fosgate Power 20001 bd amplifier power rating?? pachoorion Car Audio 8 8th May 2011 11:49 PM
Power transformers versus amplifier output power..what is your option? destroyer X Solid State 38 9th May 2009 06:23 PM
McIntosh Power Amplifier Power Guard johnnyrt Solid State 2 23rd August 2007 11:22 PM
Output power for a power amplifier Progg70 Solid State 33 10th September 2006 09:44 AM
Amplifier 3000 Wats Rms Power + Smps Higcht Power Bestiality MARAVILLASAUDIO Class D 1 5th November 2004 05:06 PM


New To Site? Need Help?

All times are GMT. The time now is 06:42 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2