PicKit 2 FULL with TH components - Need help with layout

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me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

16 Dec 2008 16:11 pickit2 circuit

Thanks Computerman29.

ya...they do not exist in my schematic as well. I just follow the components counting & found that it was missing.

For the 24LC512, I think its compatible to use 24C512 as the data are quite close with same clock frequency at 400khz & voltage up to 5.5V. I'll give it a try, if failed only I get the original part.

Another thing is the MOSFET are difficult to get.

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1680
Helped: 100
Location: Toronto, Canada

16 Dec 2008 16:51 pickit2 vdd error voltage

Don't bother with the EEPROMs or BS250 / 2N7000 they're only needed for VPP before VDD programming and the EEPROMs are only for on the go programming.

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

17 Dec 2008 3:22 bs170 replacement

Hi Sarma,

I didn't made any changes to the schematic.

Did some one done this project? Pls share some photo.

By the way, can some one modify this circuit to programing with out PC? Thanks!

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1680
Helped: 100
Location: Toronto, Canada

17 Dec 2008 3:45 fet bs250 replace

If you're going to build a complete PK2 why not just buy one. They're not that expensive.

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

17 Dec 2008 8:35 pickit2 tme video

Hi Computerman29,

I think the NTD3055L can't be replace by 2N7000 & NTD20P06L can't replace by BS250 as the lead are difference.

I only can get the NTD3055L Farnell & failed to get NTD20P06L.

Any idea?

nishal

Joined: 04 May 2007
Posts: 101
Helped: 6

17 Dec 2008 9:15 error vpp pickit 2

Hi all,
Thanks sharma for your reply.

Please confirm the following replacements.

1. IRF9610 (P-Channel [TO 220 package]) instead of BS250

2. opamp 741 instead of MCP6271

I have used the above replacements, but I receive a VDD/VPP Voltage level error.

On pickit2 application startup, the device goes to continuous BUSY led blinking i.e. VDD/VPP error

voltage levels are
On idle condition, vdd = 2.6V and on calibration, vdd = 3.8V.

Any help or advice would be greatly appreciated.

NB : I will be posting the single sided TH pcb layout after all the corrections.

Thanks

Nishal

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

17 Dec 2008 12:14 vdd and vpp voltage level error

nishal wrote:

Temporarily you may use 9610
instead of 741 better try TL081 Mosfet opamps

you may check the diodes and better use tant. electrolytics at specific locations like Vpp generation,instead of ordinary electrolytic caps. the ESR matters a lot
check the pin configuration of FETs and other transistors for the errors you mentioned..

Sarma

Added after 7 minutes:

blueroomelectronics wrote:

If you're going to build a complete PK2 why not just buy one. They're not that expensive.

Yes Sir, you are right in both posts. EEProm and MOSfets are not essential
but with chips likeF628A where internal clock working for general programming, one perhaps needs Vpp before Vdd.
Even the Opamp is not needed unless, one wants to generate other Vdd supplies, internally.

I assume that, these guys/gals are making it not for using alone but for a feel of realizing a project (proven) in its totality, with their local means.

Computerman29

Joined: 23 Jul 2006
Posts: 138
Helped: 4
Location: Valparaiso, IN USA

17 Dec 2008 13:01 pickit vpp voltage level error

Quote:

By the way, can some one modify this circuit to programing with out PC? Thanks!

This circuit is the original PicKit 2 done in TH. It needs no modification to program without PC.

Quote:

IRF9610 (P-Channel [TO 220 package]) instead of BS250

Don't know, but looks good.

Quote:

opamp 741 instead of MCP6271

Do not use 741. The op-amp needs to be a CMOS rail to rail I/O.

For the voltage errors, check the transistors, MOSFET's, diodes, and IC's. Make sure they are properly inserted.

Quote:

I assume that, these guys/gals are making it not for using alone but for a feel of realizing a project (proven) in its totality, with their local means.

You are correct. It would have been much less hassle and only a few more dollars to just buy an original, but as I have said in other posts, some people (like myself) just like to build things! Very Happy

Quote:

I think the NTD3055L can't be replace by 2N7000 & NTD20P06L can't replace by BS250 as the lead are difference.

Exchange the parts in Eagle (schematic), then modify the layout (in Eagle), and they will work nicely. The layout could be dramatically improved anyway.

One more thing:

Don't forget to solder a .1uF ceramic cap between the power pins of the PIC. An 0805 surface-mount on the bottom of the board is best.

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1680
Helped: 100
Location: Toronto, Canada

17 Dec 2008 19:28 pickit 2 2.60 source

Quote:

You are correct. It would have been much less hassle and only a few more dollars to just buy an original, but as I have said in other posts, some people (like myself) just like to build things!

Me too, that's why I sell kits like the Junebug.
[/quote]

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

18 Dec 2008 3:51 pickit 2 tgt

Hi Computerman29,

I'll try to edit the schematic, modify the layout & remove all my components into new layout. It take some time to do a new board, printing & etching will not take too long but when came to drilling .......a lot of holes to drill Razz

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

23 Dec 2008 14:02 icd2 clone schematic

any news on this thread?

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1680
Helped: 100
Location: Toronto, Canada

23 Dec 2008 15:49 irlml6402 altium device

me_guitarist wrote:

any news on this thread?

I thought you were going to post your results.

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

24 Dec 2008 2:47 pickit2 altium

I haven't done it as still searching for the suitable N & P-channel MOSFET & waiting for 18F2550 & MCP6271 to complete.

manish12

Joined: 21 Nov 2006
Posts: 1019
Helped: 31

17 Jan 2009 5:48 pickit2-eagle.zip

any one have the ss pcb for the pickit , and what are the best replacement for opamp mcp6001

nishal

Joined: 04 May 2007
Posts: 101
Helped: 6

17 Jan 2009 7:30 adapter that plugs into pickit2

Hi all,
Here is the PCB Layout in Single side for TH Components. As stated in my earlier post, I am using substituted components for BS250, MCP6271, inductor etc. probably that may be the reason why I am not able to get it workable.

All the best!!!

Nishal

Sorry, but you need login in to view this attachment

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

17 Jan 2009 9:56 pickit offer

nishal wrote:

Greatful for the Nice board Nishal !

Did you just follow the schematic or checked it w.r.t the microchips Schematic as published in the Pickit2 user guide? I suspect the positioning of Q1 , U5-N and U5-P

please do it and it is a good and purposeful exercise.

Sarma

Last edited by mvs sarma on 17 Jan 2009 10:11; edited 1 time in total

nishal

Joined: 04 May 2007
Posts: 101
Helped: 6

17 Jan 2009 10:07 fdc6420 dip

Quote:

Did you just follow the schematic or checked it w.r.t the microchips Schematic as published in the Pickit2 user guide?
please do it and it is a good and purposeful exercise.

Sarma

I followed computerman29's schematic.

Nishal

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

17 Jan 2009 10:13 coding layouts torails

nishal wrote:

Quote:

Did you just follow the schematic or checked it w.r.t the microchips Schematic as published in the Pickit2 user guide?
please do it and it is a good and purposeful exercise.

Sarma

I followed computerman29's schematic.

Nishal

I suspect D&S reversals in the schematic for all the three MOSFETs. please check carefully

But to my surprise, the placement some of them was correct! was it due to manual forced routing?

Sarma

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

18 Jan 2009 7:30 pickit2 + could not fully calibrate the unit

@Nishal

Perhaps you may add this combined overly that i made using Paint, to your attachments to help any enthusiast who wants to make it<img src="http://images.elektroda.net/37_1232260175.png">

nishal

Joined: 04 May 2007
Posts: 101
Helped: 6

18 Jan 2009 9:31 full pickit2 clone th

Thanks sharma for the comments & suggestions, Here is the assembly drawing.

Nishal

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wizpic

Joined: 23 May 2004
Posts: 407
Helped: 30

18 Jan 2009 10:24 tlv2372

Nishal what did you draw the PCB in ?

nishal

Joined: 04 May 2007
Posts: 101
Helped: 6

18 Jan 2009 16:43 irlml6402 pin layout

Altium Designer Summer 08

Nishal

wizpic

Joined: 23 May 2004
Posts: 407
Helped: 30

18 Jan 2009 17:20 vpp voltage level error

COOL could you upload the Altium files Please this would be a help,

And yes by the way what a very good job in the layout

wizpic

Last edited by wizpic on 18 Jan 2009 21:16; edited 1 time in total

Computerman29

Joined: 23 Jul 2006
Posts: 138
Helped: 4
Location: Valparaiso, IN USA

18 Jan 2009 20:15 pickit 2 + opamp

Hello all,

Sarma is correct about the MOSFET's. Source and drain are mixed up on all of the MOSFET's in my original schematic. The reason is I did not know the symbols for source and drain, and I mixed them up - and I made a mistake on Q1. I believe it has been corrected now on Nishal's board and layout.

Quote:

what are the best replacement for opamp mcp6001

The op-amp must be CMOS single supply and rail-to-rail I/O (like the original). I wanted to stay with Microchip for the op-amp. The MCP6271 is TH and most closely matches the specs of the MCP6001, but I only looked at parts from Microchip. Check the datasheet of the MCP6001. There are certainly others that will work. TI, Fairchild, Maxim/Dallas, National, ADI, Intersil and others all probably make suitable replacements. Same thing with the other components.

BTW, Sarma and Nishal, Excellent job!!

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18 Jan 2009 20:15 Ads

mvs sarma

Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.

18 Jan 2009 21:49 irlml6402 replace

Computerman29 wrote:

Quote:

what are the best replacement for opamp mcp6001

It is Nishal who did a Nice job, and deserves all the appreciation. I Understand that he took your schematic for granted. Perhaps after another iteration and with schematic correction the best possible in single sided board can come out. MCP6002 could be used by using only one opamp, perhaps. Availability is a real issue. MCP602 are more readily avialable at around $0.6/- but it is onli output rail to rail but not input.

sarma

nishal

Joined: 04 May 2007
Posts: 101
Helped: 6

19 Jan 2009 3:41 layout components in d&g

Sharmaji FYI MCP6271 is available at in.farnell.com and cost only Rs. 41.40 / 1 pc. when compared to microchip's sample processing fee ($7.5) its cheaper.

Nishal

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

19 Jan 2009 4:04 irlml6402 pinout

Hi guys,

whats the mosfet we use now?
I still can't get the MOSFET for my board.

Pls clarity.TQ!

wizpic

Joined: 23 May 2004
Posts: 407
Helped: 30

19 Jan 2009 5:14 2n7000 eagle

Nishal
Will you upload the altium files please ?

me_guitarist

Joined: 03 Oct 2006
Posts: 280
Location: Malaysia

20 Jan 2009 3:26 bs250+replacement

Quote:

ORIGINAL:Nishal

Hi all,
Here is the PCB Layout in Single side for TH Components. As stated in my earlier post, I am using substituted components for BS250, MCP6271, inductor etc. probably that may be the reason why I am not able to get it workable.

All the best!!!

Whats the MOSFET you use?
I can't get any suitable MOSFET here.[/img]