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mvs sarma
Joined: 23 Apr 2006
Posts: 147
Helped: 13
Location: Hyderabad, India.
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 23 Apr 2008 15:35 Re: PicKit 2 FULL with TH components - Need help with layout |
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I saw your board. As a Hobbyist and for personal use , Really Nice Job. Yes we want a working programmer.
Sarma
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melc
Joined: 08 Apr 2005
Posts: 390
Helped: 45
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| 23 Apr 2008 17:44 Re: PicKit 2 FULL with TH components - Need help with layout |
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| Computerman29 wrote: |
Hey wizpic,
It may not be pretty, but it works perfectly. For me, the size does not matter. I never planned on putting it in a case. I could have EASILY made it MUCH smaller if I used a two-sided board and/or SMT devices. The idea was to KEEP IT SINGLE SIDED so the average hobbiest could build it. It probably would have been much less trouble to just buy an original or a funnynypd clone, but as I have said in another post, Some people (like myself) just like to build things!! 
To anybody who has read this topic, If you can make a better SINGLE-SIDED THROUGH-HOLED board, by all means go ahead.
And to anybody who does, I kindly ask that you share it.
Peace
Added after 1 minutes:
BTW, apology accepted. |
No offence, is a great job to share your work, but also is a great virtute to accept all good critiques. Your PCB design is working with a lot of luck. In fact any old electronist engineer will see you are really a beginer in PCB design. Because I care about the way you'll see this job in the future, I will comment only the bad things in your PCB design. Take those as you want to:
1. You have created a huge ground loop on the bottom side around the board, never do it again. Instead of this use either a large ground plane or a large route. Noisiest components closest to the supply point, low current drawn components far away to the supply point, the ground circuit must follow the ideea above with the shortest connection possible
2. Never use the same trace for signals and supply, even if the supply current is small, keep supply routes at least twice than signal routes
3. When filter a supply signal near a component, the smallest capacitor must be very close to the component, the electrolitical capacitor may be far away (but still close to the package)
4 When you connect an USB, the signals should be passed through ferrite chokes, and the USB iron case connector MUST be connected with a ferite choke to the PCB ground to avoid ESD damages through ground trace/plane
5. There is no filtering capacitor near the microcontroller supply (VDD to VSS- 47nF to 100nF)
6. The schematic is drawn without any respect for the reader, is difficult to read and has a lot of connection points which should be not there (connection points only to cross of the traces)
7. The PCB layout has been designed without any respect for the own eye (the upper right corner is empty while the rest of the PCB is filled with components.
My comments does not means you should not be happy you have designed this board and this time it works for you, but next time try to correct those mistakes.
And yes, this board can be designed on a single layer board, maybe with a few wire bridges.
best wishes,
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funnynypd
Joined: 09 May 2007
Posts: 669
Helped: 17
Location: USA & Canada
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| 23 Apr 2008 18:00 PicKit 2 FULL with TH components - Need help with layout |
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One more comment here:
Decent design sometime need a good design toolset.
Some of those tools really cost money.
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Computerman29
Joined: 23 Jul 2006
Posts: 124
Helped: 4
Location: Valparaiso, IN USA
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| 25 Apr 2008 11:25 Re: PicKit 2 FULL with TH components - Need help with layout |
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You are correct. I an new to PCB design. Building this PicKt 2 was a huge learning experience for me that keeps on paying dividends. Thank you very much for the advice.
BTW, I did solder a 0805 100nF on the bottom of the board between the power pins of the PIC..
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1229
Helped: 60
Location: Toronto, Canada
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| 25 Apr 2008 22:00 PicKit 2 FULL with TH components - Need help with layout |
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If you want to BUILD a FULL KIT it'll be cheaper to buy FunnyNYPDs version.
If you just want a PICkit2 they're not expensive and about $47US
If you want a PICkit2 SE (no 3.3V or EEPROM build in) but a 18F1320 experimenter built in then buy my Junebug kit.
Either way you're only going to save a couple of dollars to build it yourself (or spend more because you're buying it in single quantities)
You also need some way of programming the firmware on the 18F2550 if you do it yourself.
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julius64
Joined: 07 Dec 2006
Posts: 36
Helped: 1
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| 28 Apr 2008 4:42 PicKit 2 FULL with TH components - Need help with layout |
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Vary thank guy for your work, and congratulations. But i have a question: ¿someone have a .hex with program a 18F2550??. I dont have this code. and for I make this project, I need the code.
If someone can give me a code, very thank.
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Computerman29
Joined: 23 Jul 2006
Posts: 124
Helped: 4
Location: Valparaiso, IN USA
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| 28 Apr 2008 7:49 Re: PicKit 2 FULL with TH components - Need help with layout |
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| The code for the PicKit2 is in the folder of both MPLAB IDE and PicKit2 software. Look for a file called PK2V022000.HEX (version 2.2) or PKV023000.HEX (version 2.3). The current version is 2.5.
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funnynypd
Joined: 09 May 2007
Posts: 669
Helped: 17
Location: USA & Canada
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julius64
Joined: 07 Dec 2006
Posts: 36
Helped: 1
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| 29 Apr 2008 4:42 PicKit 2 FULL with TH components - Need help with layout |
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| very thank I have this file.
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gorkin
Joined: 27 Feb 2002
Posts: 605
Helped: 8
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| 04 May 2008 19:00 Re: PicKit 2 FULL with TH components - Need help with layout |
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A Brazilian company called microgenios (http://www.microgenios.com.br/news/index.php?option=com_content&task=view&id=101&Itemid=152) has build a clone of PICkit2 too...
Above, screen-shot of the board:
[img]http://www.microgenios.com.br/news/index.php?option=com_content&task=view&id=101&Itemid=152[/img]
Pretty nice not? I think that the connectors for programming will be the same founded in ICD2, the "standard" of Microchip...and the inductor used in the board is for rf application and not dc-dc converter application (because of electrical parameters)...
Will be nice if anyone can try develop same board using one side with few jumpers...its a next challenge that I will try!
Gorkin
[/img]
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SII
Joined: 15 May 2007
Posts: 1
Location: Mexico city
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| 11 May 2008 3:24 Re: PicKit 2 FULL with TH components - Need help with layout |
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Does anyone has a replacement for the IRLML6402 in T092 package?
Thanks.
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mvs sarma
Joined: 23 Apr 2006
Posts: 147
Helped: 13
Location: Hyderabad, India.
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| 24 May 2008 19:54 Re: PicKit 2 FULL with TH components - Need help with layout |
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| SII wrote: |
Does anyone has a replacement for the IRLML6402 in T092 package?
Thanks. |
For P-Chl Mosfet, you may use BS250 or 2N7000 . the pin out depends on the manufacturers, but they are compatible to TO92 package
Sarma
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Computerman29
Joined: 23 Jul 2006
Posts: 124
Helped: 4
Location: Valparaiso, IN USA
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| 29 May 2008 5:13 Re: PicKit 2 FULL with TH components - Need help with layout |
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| Quote: |
For P-Chl Mosfet, you may use BS250 or 2N7000 . the pin out depends on the manufacturers, but they are compatible to TO92 package
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Sarma,
2N7000? Are you sure? Those have a much smaller current rating than the original part. Or is the original part overkill? TO92 for the MOSFETS would save a bit of board space, but can they handle the current? Has anybody used TO92 package for this project?
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1229
Helped: 60
Location: Toronto, Canada
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| 29 May 2008 13:14 PicKit 2 FULL with TH components - Need help with layout |
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| There is a 1K resistor in series with the 2N7000, it'll see very little current when in use.
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lee40039
Joined: 01 Jun 2006
Posts: 6
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| 03 Jun 2008 9:40 PicKit 2 FULL with TH components - Need help with layout |
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good
Added after 3 minutes:
BRD not protel99 file?
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hassan1980
Joined: 14 Jan 2005
Posts: 209
Helped: 3
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| 19 Jun 2008 17:22 Re: PicKit 2 FULL with TH components - Need help with layout |
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| blueroomelectronics wrote: |
| There is a 1K resistor in series with the 2N7000, it'll see very little current when in use. |
Hi,friend
By the way, I don't have at my country this transistor BS250 can I use instead of it PNP transistor for example BC557
on the other hand, at your schematic for PIKIT2 SE there is no names for pins for 2N7000 and BS250 I mean how to know Gate, Source and Drain
I appreciate your effort
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1229
Helped: 60
Location: Toronto, Canada
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| 19 Jun 2008 23:31 PicKit 2 FULL with TH components - Need help with layout |
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Consult the datasheet for the FETs, the pinout does vary.
You really don't need either FET you can just use a 1N5817 diode between USB power & VDD on the ICD connector.
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hngm
Joined: 19 Jul 2006
Posts: 6
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| 20 Jun 2008 9:26 Re: PicKit 2 FULL with TH components - Need help with layout |
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hi all,
PICKit 2 made in Vietnam
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hassan1980
Joined: 14 Jan 2005
Posts: 209
Helped: 3
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| 20 Jun 2008 23:23 Re: PicKit 2 FULL with TH components - Need help with layout |
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| blueroomelectronics wrote: |
Consult the datasheet for the FETs, the pinout does vary.
You really don't need either FET you can just use a 1N5817 diode between USB power & VDD on the ICD connector. |
I get it
your efforts are appreciated
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mvs sarma
Joined: 23 Apr 2006
Posts: 147
Helped: 13
Location: Hyderabad, India.
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| 09 Oct 2008 6:54 Re: PicKit 2 FULL with TH components - Need help with layout |
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| mvs sarma wrote: |
| SII wrote: |
Does anyone has a replacement for the IRLML6402 in T092 package?
Thanks. |
For P-Chl Mosfet, you may use BS250 or 2N7000 . the pin out depends on the manufacturers, but they are compatible to TO92 package
Sarma |
Extreemly Sorry. 2N7000 is an Nchannel MOSfet. we have to search for more of Pchannel devices comparable to BS250.
Sarma
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