User User name Password  
   
Friday 10.1.2025 / 16:08
Search AfterDawn Forums:        In English   Suomeksi   På svenska
afterdawn.com > forums > general discussion > all other topics > homemade pcb question + adapter question
Show topics
 
Forums
Forums
Homemade PCB question + adapter question
  Jump to:
 
Posted Message
blagus
Newbie
_
3. January 2010 @ 09:34 _ Link to this message    Send private message to this user   
Hello, I'm new to this forum, I tried searching on Google and here but no answers:
1) [Etching]: I've got HCl 19%, H2O2 6% (strongest which can be easily bought in Croatia) and H2O (:)). I plan to make an 3.5cm x 2cm PCB, with toner transfer method. I'm a n00b in this, but I think that there wouldn't be necessary as much as 1L due to this small board sizr... In which qty. should I add these chemicals for etching in the concetrations above? And what if:
a) H2O2 is 3%
b) H2O2 is 30% (as I heard with this one etching is done in ~15 sec.)

2) [Adapter]: Board above will be used for PSX to Parallel adapter. Found on Emulatronia. Will that adapter work with PS2 joystick (original page says only PSX)?

3) [Adapter]:
a)Which (zener) diodes should I use to lower the voltage from USB (5V) to 3.3V? Or...
b) Can I use two 1N4007 joint in series?

Please, put your answers under numbers, I hate when I must "decode" the answer from the block of text. Also don't suggest me to "Buy an PSX to PC/USB/etc.converter/adapter/etc. etc." because I know about that and now I want to try this DIY soulution.
Advertisement
_
__
scum101
Suspended due to non-functional email address
_
3. January 2010 @ 10:15 _ Link to this message    Send private message to this user   
tough luck.. you gets your answer in the format people can be bothered with

In order of relevance..

IF the original plans state only ps1 controllers than that is what works... you will need a different design for ps2

5v from usb? .. need to drop to 3v3? .. then you need a 3v3 zener.

2x1N0447 in series.. what for? A BZX series should do unless there is any specific forward drop characteristic of the 1N4007 which is specific to the application (don't see it myself.. the 1N4007 is a standard junction diode)

Etching from mask? .. read the instructions supplied with your chemicals.

blagus
Newbie
_
3. January 2010 @ 10:38 _ Link to this message    Send private message to this user   
OK, I did understand you, thanks. But can someone else answer me 1st question then? Oh, I meant can I use 2 x 1N4007 to drop voltage to 3.3V?

Edit: Question 2 solved. WORKS.

Edit: Question 1 change: Can I use Fe(III)Cl, but in some smaller qty? for example if 250g goes on 1L can I put 125g on 0.5L or 72,5g on 0-25l (which I think should be enough for this size...)

This message has been edited since posting. Last time this message was edited on 3. January 2010 @ 11:26

ddp
Moderator
_
3. January 2010 @ 15:44 _ Link to this message    Send private message to this user   
blagus, take that link out of your sig ASAP as per forum rules.
scum101
Suspended due to non-functional email address
_
3. January 2010 @ 17:16 _ Link to this message    Send private message to this user   
as long as the chemicals are mixed in the same concentrations the amounts don't matter.. xxx per xxx .. in the same proportion .. it's the concentration of the solution that is important whether it's 10ml or 50,000 gallons.

the 1N4007 is rated to have a 1.1v forward drop at 1A .. but less current will appreciably alter that. You will have to measure the current taken by the circuit with a controller connected from a 3v3 source then do the numbers.. it's easier to just use a 3v3 zener as on 4 different sheets I saw anywhere from 0.4v to 1.7v quoted for the forward drop depending on maker.. and obviously it's not a relevant figure for most diodes in the small signal category. They should do the job, but if it all goes bang don't blame us. Modify anothers circuit without knowing what the consequences might be isn't really sensible.. a zener is connected across (parallel) to the power source.. a series pair of 1n4007's will have to be in the supply rail. They will not provide any overvoltage protection, and you could achieve the same with one resistor if you work out the total current drain of the circuit.

Why do people come here asking about electronic circuit design modifications when it's so clear I'm the only actual qualified electronics engineer here? I haven't seen the circuit so I can't even begin to guess how much current it might draw.. .. would do far better on some proper electronics forums because this is well outside the remit of this site.

blagus
Newbie
_
4. January 2010 @ 02:52 _ Link to this message    Send private message to this user   
Originally posted by ddp:
blagus, take that link out of your sig ASAP as per forum rules.
Done.

Originally posted by scum101:
as long as the chemicals are mixed in the same concentrations the amounts don't matter.. xxx per xxx .. in the same proportion .. it's the concentration of the solution that is important whether it's 10ml or 50,000 gallons.

the 1N4007 is rated to have a 1.1v forward drop at 1A .. but less current will appreciably alter that. You will have to measure the current taken by the circuit with a controller connected from a 3v3 source then do the numbers.. it's easier to just use a 3v3 zener as on 4 different sheets I saw anywhere from 0.4v to 1.7v quoted for the forward drop depending on maker.. and obviously it's not a relevant figure for most diodes in the small signal category. They should do the job, but if it all goes bang don't blame us. Modify anothers circuit without knowing what the consequences might be isn't really sensible.. a zener is connected across (parallel) to the power source.. a series pair of 1n4007's will have to be in the supply rail. They will not provide any overvoltage protection, and you could achieve the same with one resistor if you work out the total current drain of the circuit.

Why do people come here asking about electronic circuit design modifications when it's so clear I'm the only actual qualified electronics engineer here? I haven't seen the circuit so I can't even begin to guess how much current it might draw.. .. would do far better on some proper electronics forums because this is well outside the remit of this site.

OK then, I'll try to get help somewhere else.
Thanks for your help
Advertisement
_
__
 
_
kaesarna
Suspended permanently
_
15. January 2010 @ 03:41 _ Link to this message    Send private message to this user   
spam edited by ddp

This message has been edited since posting. Last time this message was edited on 15. January 2010 @ 12:55

afterdawn.com > forums > general discussion > all other topics > homemade pcb question + adapter question
 

Digital video: AfterDawn.com | AfterDawn Forums
Music: MP3Lizard.com
Gaming: Blasteroids.com | Blasteroids Forums | Compare game prices
Software: Software downloads
Blogs: User profile pages
RSS feeds: AfterDawn.com News | Software updates | AfterDawn Forums
International: AfterDawn in Finnish | AfterDawn in Swedish | AfterDawn in Norwegian | download.fi
Navigate: Search | Site map
About us: About AfterDawn Ltd | Advertise on our sites | Rules, Restrictions, Legal disclaimer & Privacy policy
Contact us: Send feedback | Contact our media sales team
 
  © 1999-2025 by AfterDawn Ltd.

  IDG TechNetwork