[Alt-photo] 365 nm. UV-densitometer.

[Erich Camerling]

You -do-it-yourself means :

1 : you have to make your own printed circuit boards or you must have a 
friend who can make them for you. ( our print-drawings you can have via 
      the internet for free at the end of this series of articles) When 
a specialized company will make the printed circuit boards it will cost 
you lot of      money  I suppose.

2 : You have to buy  all the components  yourself (or have a 
friend........) ( we will give you a detailed list on internet for free)

3 : Don't start with this DIY project when you don't have sufficient 
knowledge of electronics e.g.. you cannot "read" (=  understand) a 
wiring diagram and don't have a good small soldering iron and/or never  
used such an iron for soldering small parts like IC's , resistors , 
capacitors etc.

4 : The complete paper will contain 7  chapters : 1 : power supply ,
2 : electronic  "clock factory" ,
3 : LED driver ,
4 : sensor
5:  inversion circuit
6 : other things as  : DVM
7 : software

5 : For printing the print-drawings you need a laser printer or an 
inkjet printer and associated film.I need two identical transparencies 
on top of each other because the density of one transparency was too low 
at my inkjet printer to reach a good result.

6 : BEFORE starting the project you MUST have ( and use !!) a pair of 
spectacles with polycarbonate glasses ( see the reason for that at : 
www.opticampus.com/tools/transmittance.php : " polycarbonate" spectral 
transmittance ) to protect your eyes against the tremendous and 
dangerous amount of UV-light.
I bought an "UVEX Hi-res super OGT " pair of glasses ( EUR 20.= ) .When 
you know another one ( better and/or cheaper )  it is of coarse also okay.
Please let me know.

7 : The transparencies are designed by my friend with Eagle V.5.11 prof .
You need the FREEWARE version from 
www.cadsoftusa.com/download-eagle/freeware/ to become the possibility to 
print the print-drawings , electronic diagrams etc.

To be continued next week.

PS. I realise there will be a problem because it is not permitted to add 
attachments ( such as wiring diagrams ) to the e-mail on this site.
        What will be the best solution for this problem for alt-photo 
members ?