Answering more questions I live in Spain, but I expecially admire USA because undoubdtedly it is the land of the oportunities.
I liked the words of the Brazilian member, because my original post was also thinking in Countries with few electronic resources.
My method to make PCBs can be good for those countries because rustic devices as an electric iron for clothing, window glasses, milk tetrabriks, pvc pipes, ... are used, saving the purchase of expensive comercial devices as light insolators, machines for acid or CNC PCB mills.
Chemicals are also easy to find:
- Acid -> 16% HCL in water. (I think the popular home cleaner "agua fuerte" is very similar)
- H202 (in Spanish "agua oxigenada") -> added to acid to make faster reaction burning the Cu of the PCB (I think can be easily found in any pharmacy)
- NaOH -> 14 gram per water litre -> to remove (after insolation) the paint of the zones of the PCB where Cu should be finally removed. Ultracheap chemical that can be also buyed as a cleaning product "sosa caustica".
NO MORE CHEMICALS. Easily found even in low development countries.
Possibly the Bungard virgin board would be difficult to find there but I have readed (not tested) an alternative solution where ONLY simple virgin PCB with just fiberglass and cooper can be used. The special light paint should be sprayed in dark room by the user from a spray tin called POSITIV-20 of the firm Kontak-Chemie.
If I learn to "really" insert images in this posts, I could try to show a step by step method to make an Arduino S3v3 with my rustic way, and ovbiously if you are interested.
And Oracle, I might have been too optimist in the overall S3v3 parts price, but remember, the S3v3 USES the ATMEGA8, NOT THE ATMEGA16.
The ATMega8 is a ultrapowerfull chip. Forgetting usefull pins, it is more powerfull than a PIC16F877 (the Rolls Royce of the 16 PICS), and I personally think the ATMega8 is even better than a PIC18F452.
The ATMega16 is ovbiouly more powerfull, but also more expensive. Remember this post sequence is thought for POOR people.
I think 5 ATMega8 can be received at home for just 9 dollar through eBay -> 9/5=1.8 dollar. You have still 3.2 dollar for the rest of the S3v3.
And finally Mr Adilson Akashi, as I have not found any thread close to "Buy through eBay" in the forum I will start a new one with this title, where I will explain to users from "far" countries, how to buy by internet without the international credit card you mention.