8-14 -> 19v Circuit

jol · 08-20-2003, 09:04 AM

Click for larger pic

1. 5 A Fast fuse, designed for use in vehicles 33-051-25
2. 470 uF Electrolytic capacitor for general use 67-009-34
3. 4.7 K ohm resistor 60-105-73
4. 16v 5w Zener diode 70-067-03
5. 22 uF Electrolytic capacitor for general use 67-008-27
6. 4.7 K ohm resistor 60-105-73
7. 47uH Chip-choke Suitable for DC/DC-converters and other power applications. 58-830-46
8. 100nF Ceramic capacitor 65-656-59
9. 4.7 K ohm resistor 60-105-73
10. SG3524 or SG2524 Ic
10.1 Low-price socket for DIL packages 48-161-38
11. 8.2 K ohm resistor 60-102-43
12. 3.3 nF Ceramic capacitor 65-694-46
13. 4.7 nF Ceramic capacitor 65-694-79
14. Wirewound power resistor, 5 W60-555-11
15. High power resistor 120 ohm 60-433-84
16. 22 K ohm resistor 60-106-56
17. N-Channel Enhancement Mode Field Effect Transistor
18. 30 K ohm resistor two 60-106-31 inline
19. 4.7 K ohm resistor 60-105-73
20. 470 uF Low impedance electrolytic capacitor 67-150-72
21. High current diode MBR745 70-042-37

Datasheets at each page

a. changed 20 into a low impedance one.
b. added all caps and resistors

captain_jim1 · 08-21-2003, 02:49 AM

I am also interested in something like this. I tried to buy an adapter on ebay and ended up gettin screwed on the deal .. man that makes me mad..

pcman · 08-21-2003, 05:12 AM

didnt sproggy make a voltage booster fr the iopener that was 18v or something might be worth checking his site sorry i dont know it anymore

cheers
pcman

Rob Withey · 08-21-2003, 06:47 AM

The S is a fuse.
The 4.7R is 4.7 ohms, also sometimes written 4R7.

Rob

captain_jim1 · 08-21-2003, 10:51 AM

I have no idea how to read that thing. I'm good at constructing electronic stuff (or so I like to think), but I'm unfamilar with most of those symbols.

Anyone feel like taking them time to explain them? I'll buy you a cookie!

jol · 08-21-2003, 02:00 PM

http://www.aaroncake.net/electronics/schem.htm
This is Aaron Cakes's site, he was once a active member here. Send him a cookie aswell

captain_jim1 · 08-22-2003, 03:23 AM

How come most of these symbols aren't on that website?

Rob Withey · 08-22-2003, 04:27 AM

Quote: Originally Posted by captain_jim1

How come most of these symbols aren't on that website?

Erm, afaics, most of them are. There are just a few that aren't. It's not like they are particularly non standard.

Ok, a quick rundown of what everything is:

The S thing with 5A next to it is a fuse.
The Zigzag things are resistors.
The --| (-- things are polarised capacitors (eg electrolytic).
The --| |-- things are non polarised capacitors (eg, ceramic).
The thing with 16V next to it is a Zener diode.
The UUUU thing is a coil.
The SG3524 is an integrated circuit (chip).
The MBR745 is a diode.
The NDP6051 is a n-channel mosfet.

Hope that helps

Rob

jol · 08-22-2003, 04:57 AM

Quote: Originally Posted by Rob Withey

Hope that helps
Rob

Certanly made my day, THANKS ALOT!

captain_jim1 · 08-22-2003, 08:54 AM

You da man!

Ricky327 · 08-22-2003, 09:48 PM

Ahem...you are only 1% there. I hope you got enough cookies

You need to get the pinout connections for the IC, transistor, diodes, capacitors.

Work out the current/power rating of the coil.

Most resistor are 1/4Watts but watch out for the low value such as 120Ohms or 0.02Ohms...all depends on how much current is being passed. I dont even know if you can just buy a 0.02Ohms, you might need to make one with resistance wire of a known resistance per meter, with the correct power rating.

You need an electrolytics type capacitors or ceramics. Get the radial type for the electrolytic capacitors, it save some spaces. The voltage rating should be above the highest voltage you gonna apply, 35V should be fine.

The fuse can be 20mm 5A type T, anti-surge.

Design your own PCB, etch, drill and then solder the components. 19V at 3A is a lot of power to pass on those copper clad PCB so make sure you make those power lines very thick...specially the grounds. Put some proper power connectors for neatness.

Dont forget to buy some spare parts, its easy to blow them up if you are not careful.

The hardest part of the project is finding shops with the right parts. The rest are very easy.

And dont forget to put the transistor on a heatsink.

More cookies please...thank you

Rob Withey · 08-23-2003, 04:55 AM

Awww, you spoilt it for them. ;-)

The 0.02 Ohm resistor will need to deal with some serious current, but not power (Power = I*I*R and R is very small). None of the other resistors would appear to need to deal with much current.

The MBR745 will also need heatsinking. If you get the surface mount NDP6051, the circuit board is the heatsink and you'll need good airflow and decent copper planes.

Datasheet for the IC is here : http://focus.ti.com/docs/prod/produc...tNumber=sg3524

jol · 08-23-2003, 07:00 AM

I think I can get most parts from ELFA, a Swedish electronics store. http://www.elfa.se/en/
If you want to find all of the components and list them along with the elfa #, I will send you a box of cookies.

Ricky327 · 08-23-2003, 08:39 AM

Still not much info on my last post.

Pinout for the transistor :
http://www.chipdocs.com/pndecoder/da...R/NDP6051.html

Im from SE London by the way, near lewisham. Where are you Rob? so jol can send up some swedish cookies

tack saa mycket jol :P

jol · 08-23-2003, 12:27 PM

ok a update, please help me out