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[PIC] [BRENNER9L] Is this schematic correct?

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Hey guys
This is PIC Programmer Schematic:
brenner9l_sch_alpha.png
The VPP here is sourced directly from PIC pin, is it okay? Shouldn't it be sourced from 5V+ rail?
Also, can I put some other PNP/NPN transistors in the place of those (BF959 and BC328) if I don't have them?
Thanks in advance
 

It may be possible to source enough current for Vpp but bear in mind this design can only program devices in LVP mode and out of circuit. For the sake of a few extra components it can work in LVP and high voltage modes. All I can say is this design would be banned from my workbench !

Brian.
 

betwixt said:
It may be possible to source enough current for Vpp but bear in mind this design can only program devices in LVP mode and out of circuit.
Brian.
Click to expand...

Are you sure? I'm pretty sure thats a normal programming mode but only for 3.3V pics, I mean: "Um 3,3V-PICs (PIC18FxxJxx, PIC24, dsPIC33F)".
 

Hi,

What about a couple of ceramics capacitors for VCC?

Klaus
 

Most PIC smaller can be programmed using LVP at 5V and 3.3V but you lose the use of the PGM pin for other purposes. The PIC24+ series do not lose the the pin but regardless of that, the Brenner9L design is borderline on being able to provide enough drive current for ICSP. Also note that if you fit the 3.3V regulator, you may not be able to program 5V devices, especially with ICSP. For very little extra cost, why not build a clone Pickit 2 or Pickit 3 which is fully compatible with virtually all PICs and many memory devices too.
To me, it seems you go 90% of the way to a good proven design when the extra 10% makes it so much more versatile.

Brian.
 

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