JDM2 Pic Programmer help

[ikhan42]

Hi Everyone,

I am looking at building a pickit2 programmer and ofcourse I need the chicken or is it the egg LOL.

I need a programmer that can program the 18f2550 microprocessor. I have found a circuit at the following address https://electronics-diy.com/electronic_schematic.php?id=823 but am a little confused with their wiring diagram firstly they are using the 2n3904 transistor but Q1 on their circuit diagram has me confused it is the wrong way around I understand that they can mirror it but I just want to confirm that the c and e pins are going to the right locations on the circuit diagram.

Also with regards to the resistors they dont advise wattage for resistors do I assume 0.5watts?

Also can someone tell me what the ground is meant to connect to. When I load the circuit on eagle schematics it leaves the ground seems to be of c2 not connected to anything.

Any help would be greatly appreciated.

Just to give some background. I am looking at building a UV exposure box that will run of a pic16f84-04 timer. I want to make this box as my 11 year old wants to learn programming and electronics and is also getting interested in Robotics so I figured a UV exposure box for making PCb is a good place to start. I will then use the uv exposure box to build a pickit2 programmer. I have some books on robotics and pic micro controller and then my son and I can start learning together.

Hope someone can help me with my Question above and sorry if the background wasnt needed or boring (lol)

Thanks
Ikhan42

 

[embpic]

For clear ur doubts same schematic but little bit difference scematic i have here u have attached the scematic and i am using same fro long ago.

 

[ikhan42]

For clear ur doubts same schematic but little bit difference scematic i have here u have attached the scematic and i am using same fro long ago.

Hi,

Thanks for the reply but I dont understand, what do you me same but a little bit different. Can you post your schematic for me if it is different?

Thanks again
Ikhan42

 

[embpic]

plz take look there is difference of socket for COntroller in ur sch and which one provided by me there are no such socket pcb is of 1/4th of u mention.

 

[ikhan42]

ebmpic,

Thanks for that the attachment wasnt coming up yesterday on your post, but I can see it now so am having a look.

kind Regards
ikhan42

 

[ikhan42]

Hi Embpic,

Have had a look at you schematic I am guessing the other side of the SV1 is the same as the original schematic that I posted. I just wanted to confirm the zener DiodeD1 is 8.2 volts the original schematic that I attached the link to was a 6.2Volt diode. Is this correct ir was the diode over speced? Can I use my 6.2V zener diode or does it need to be 8.2 volt?

I have also noticed that the capacitors in your schematic are reversed to the original schematic that I posted please confirm this is correct and the two 39pf capacitors in the original circuit are not in your posted schematic are these caps needed I have read on some posts that they need to be added for some of the newer pic chips and I am looking at programming a 18f2550, it is great if I dont need them as it makes my circuit smaller.


Also I am using 1/2watt resistors is this ok or schould they be 1/4 watt?

I have tried the schematic that I posted and it doesnt seem to get recognised in winpic800, winpic or picpgm but I can see it writing in winpic800 as the red led flashes but then at the end of the program routing it fails.

Thanks for all your help

Ikhan42