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

Chip Amps Amplifiers based on integrated circuits

etching gainclone pcb
etching gainclone pcb
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 19th December 2009, 09:05 AM   #1
pra3718 is offline pra3718  India
diyAudio Member
Join Date: Jan 2009
Default etching gainclone pcb

Till today, I was using protoboard/veroboard and point-to-point wiring. Now I am confident that I can make my circuit layout. Yesterday, I went to my electronic part supplier for tda7294 (which I build successfully with my layout) He offer me for blank PCB and eatching powder and said do art-work by permanent marker pen on pcb. Put the pcb in PVC pot add eatching powder and warm water.

I google with "etching pcb" and got lot-off stuff. Laser printing toner transfer method is popular.

First, I have to make art-work. I use windows paint-brush. Major problem is alignment of IC's pin & coponents. I found LM3886tf & TDA7294's pin alignment is different.

1) How to calculate distance between pins ?
2) How to draw on paint-brush. The distance looks on Computer monitor does not print the same distance.
3) I experienced 4700uf 25v caps are different sizes with different brands.

How the experienced members manage these problems ?
  Reply With Quote
Old 19th December 2009, 09:09 AM   #2
Magura is offline Magura  Denmark
diyAudio Member
Magura's Avatar
Join Date: Oct 2003
Location: Denmark, Viborg
Download Eagle light, and take it from there.

Everything is possible....to do the impossible just takes a little while longer.
  Reply With Quote
Old 19th December 2009, 02:19 PM   #3
XL5 is offline XL5  Canada
diyAudio Member
XL5's Avatar
Join Date: Nov 2009
Default CAD software

I agree with Magura. Try a free electronic CAD software.
Look here;
Printed Circuit Board Computer Aided Design and Manufacturing
  Reply With Quote
Old 19th December 2009, 02:53 PM   #4
pra3718 is offline pra3718  India
diyAudio Member
Join Date: Jan 2009
Thank you, Learning Eagle light
  Reply With Quote
Old 19th December 2009, 03:00 PM   #5
gootee is offline gootee  United States
diyAudio Member
Join Date: Nov 2006
Location: Indiana
You could try this way:

Easy PCB (Printed Circuit Board) Fabrication, Using Laser Printer Toner Transfer, with a Household Clothes Iron and Glossy Inkjet Photo Paper

Basically, if you can print the pattern with a laser printer, onto glossy inkjet photo paper, you can use a hot clothes iron and transfer the pattern to the copper. The laser printer's toner is mostly plastic, and copper etchants cannot eat plastic. And voila!

I've done it hundreds of times. You can go from a computer-based design to a finshed board in less than an hour. But you have to get the details done correctly. So read the link.

There's also a good recipe for etchant, there, that's better than any of the powder types I've used, and is very cheap and made from two very-widely-available chemicals.



Last edited by gootee; 19th December 2009 at 03:18 PM.
  Reply With Quote
Old 21st December 2009, 03:40 PM   #6
chingyg is offline chingyg  South Africa
diyAudio Member
Join Date: Sep 2009
Location: South Africa
yes for the enchant use a mix of HCl and H2O2, I don't care much about the ratio through, go with your feeling, 1Hcl to 0.3 30% H2o2 seems quite good.
  Reply With Quote
Old 21st December 2009, 04:31 PM   #7
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
etching gainclone pcb
You can make excellent PCB's using an inkjet printer and special transparency to print on.

Mega-UK - Artwork Aids look near bottom of page... Jetstar film
Mega-UK - Producing a PCB

And for PCB design I find Diptrace excellent.
DipTrace - Professional Schematic & PCB Design Software

For a simple design you may just want to draw by hand and use transfers for pads etc.
  Reply With Quote
Old 21st December 2009, 04:46 PM   #8
jaycee is offline jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
Gootee's toner transfer method works very very well, but you have to find a good quality paper to use for this. Most cheap "Photo" paper just has a plastic like cover that will come away with the heat of the iron.

The stuff I use is Kodak Ultima 270 g/m2 paper. This has an ultra glossy finish like "real" photographic paper (the stuff you used to get 35mm prints on) and allows the toner to peel clean away under heat. The only thing you need to do is use a sheet of plain paper between it and the iron, or the iron sticks.

I just use regular old ferric chloride etchant as it is easy to get. I store it in an old 2L juice container (I have no young children who might drink it!) and use it in a Tupperware tray that is inside a washing up bowl filled with hot water.
  Reply With Quote
Old 21st December 2009, 07:09 PM   #9
tomchr is offline tomchr  Canada
diyAudio Member
tomchr's Avatar
Join Date: Feb 2009
Location: Calgary
I used to go the photoresist - film route for etching PCBs. But this toner transfer method sounds pretty attractive.

Does anyone have a good suggestion for a paper that will print and transfer without pinholes? The list of papers on Gootee's site hasn't been updated in a while and these office supply stores and paper manufacturers have a way of selling old wine on new bottles (eh... "rebrand") their papers every 20 minutes.


  Reply With Quote
Old 22nd December 2009, 06:05 AM   #10
head_spaz is offline head_spaz  United States
diyAudio Member
Join Date: Mar 2004
Location: Arkansas
For more information on the toner transfer pcb etching method, check out PulsarProFX.
They discovered the toner pcb process, and offer free tips, and sell some very useful supplies that really help to improve the process.
To eliminate pinholes, try using their Green Toner Foil. It is a foil-like sheet (mylar?) with a heavy pigmentation layered onto one side. After you transfer the toner to your pcb, just iron the pigmented foil over your toner to "seal up any open pores." Pretty slick process... very fast and simple to do... and it works like a charm. Turns a tedious task into a no-brainer that works perfect every time.
And if you'd like to make your boards more "professional" looking, get some white toner foil as well so you can use toner to make your silkscreen, and then iron over it using the white pigmented foil to impregnate color into your toner. I use this same method to label my front panels and stompbox enclosures. They lots of custom foil colors to choose from, even flourescents and metallics.
These guys also offer DryTransfer Decal Kits too. Very nice product... tho a bit pricey.
The toner foils cost about 9 bux each... but they last forever! Worth every penny too!

Check out their shockwave flash tutorials in the Decal Pro section of their site while you're there... because it's a very similar process, but more complex.
Writing is good exercize for the texticles!

Last edited by head_spaz; 22nd December 2009 at 06:11 AM.
  Reply With Quote


etching gainclone pcbHide 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
Etching PCB:s Loial Parts 105 12th April 2012 03:22 AM
Calculations for PCB etching solution. juma Parts 24 18th December 2006 08:43 PM
Problem with etching PCB!!! Please help! safetyman Parts 20 16th May 2006 05:35 PM
ENX bulb for PCB etching? Stocker Everything Else 0 6th May 2006 02:22 AM
Etching 4oz PCB boards kiwi_abroad Parts 4 28th June 2003 09:09 PM

New To Site? Need Help?

All times are GMT. The time now is 10:13 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