PCBs for Aleph 2, Aleph 3, Aleph 4 and Aleph 5 amplifiers - Page 5 - diyAudio
Go Back   Home > Forums > Commercial Sector > Swap Meet

Swap Meet Sell your stuff here, who knows, some other fanatic might be interested!

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
Closed Thread
 
Thread Tools Search this Thread
Old 14th July 2002, 11:57 AM   #41
diyAudio Member
 
Join Date: Mar 2002
Location: CROATIA
Hello,

The standard light bulb can not be used for the exposure.
But, if you can't find the UV lamp, it is possible to use the 500 - 1000 W halogen lamp (reflector).
Try at distance of 30 cm, 45 sec. (500 W)
Note that you must use the glass over the film, and that some heat will be dissipated from the halogen lamp.


Regards,
Kristijan Kljucaric
 
Old 25th July 2002, 07:10 PM   #42
diyAudio Member
 
Join Date: Jun 2002
i think that somewhere on the market i saw the infrared lamp.
does anyone know is it possible to use IR lamp?
what is the difference between UV and IR lamp when doing PCB exposure ?
 
Old 26th July 2002, 03:39 AM   #43
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
IR and UV are at opposite ends of the light spectrum and are certainly not interchangable.
 
Old 26th July 2002, 05:42 AM   #44
diyAudio Member
 
mpopovics's Avatar
 
Join Date: Apr 2002
Location: Hungary
Quote:
Originally posted by chorei
what is the difference between UV and IR lamp when doing PCB exposure ?
The photo lack is sensitive for UV light, usually (I mean the Positiv 20 spray).
The high power halogen lamp can be ok also, I agree with Kristjan.

BR,
Milan
 
Old 26th July 2002, 03:51 PM   #45
diyAudio Member
 
Join Date: Jun 2002
thanks AudioFreak and mpopovics,

i brought the 500 w halogen lamp and i will try to do it like kristijan-k recommended.
how much there must be NaOH in the water ?
what about water temperature ?
 
Old 27th July 2002, 08:41 AM   #46
diyAudio Member
 
Join Date: Jun 2002
hi,

the precise amount of NaOH in the water depends on photoresist manufacturer and of photoresist age ?

..and what period of time the pcb must be in the NaOH solution ?
 
Old 27th July 2002, 09:30 PM   #47
diyAudio Member
 
Join Date: Mar 2002
Location: CROATIA
Hello,

Yes, the precise amount of NaOH in the water depends on photoresist manufacturer and of photoresist age.

The period of developing is also depends on precise amount of NaOH in the water, photoresist manufacturer, photoresist age and how well is done the exposure of photoresist.
So, you must done some visual checking when developing your artwork.

Use room temperature solution of NaOH and water.



Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
 
Old 28th July 2002, 04:56 AM   #48
diyAudio Member
 
trigon's Avatar
 
Join Date: May 2002
Location: Canada
Hi Kristijan.

Any experience with Gold plated PCB, is this applicable to your boards as addition and what is your opinion about this. I personally think that it should improve things.

Thank you in advance.

Trigon.
 
Old 28th July 2002, 12:37 PM   #49
diyAudio Member
 
Join Date: Mar 2002
Location: CROATIA
Hello trigon,

The gold plating of the PCBs is possible, but it is just unneccesary to make them that way, and the cost is not justified.
There is no way to get any better sound results with the gold.

The main purpose of plating the PCBs is to protect the Cu tracks and pasds against corosion - oxidation, for improved solder joints when soldering thus lowering joint resistance.
Also, there is much less risk for cold joints.

On my PCBs I use Pb-Zn track overlay.
I enclosed the picture, and like you can see, the silver look of the pads are achived by tinplating.
The all tracks are tinplated, even under blue soldermask.


Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
Attached Images
File Type: jpg pcb1.jpg (14.3 KB, 479 views)
 
Old 28th July 2002, 04:41 PM   #50
diyAudio Member
 
trigon's Avatar
 
Join Date: May 2002
Location: Canada
Thanks.
 

Closed Thread


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
Aleph (Single Ended) + Larvadin (no Memory Distortion) = Ultimate Aleph? tiefbassuebertr Pass Labs 19 25th January 2014 02:15 AM
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions tiefbassuebertr Pass Labs 13 27th April 2012 02:13 AM
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions tiefbassuebertr Pass Labs 0 6th August 2009 11:11 AM
WTB: Aleph-mini PCBs and transistor set for Aleph 30 needtubes Swap Meet 4 6th November 2005 06:29 PM
Trade Aleph X PCBs for Aleph P 1.7 PCBs highbias Pass Labs 0 27th September 2004 05:59 PM


New To Site? Need Help?

All times are GMT. The time now is 05:15 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