> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Sarin Sukumar A
> Sent: 15 November 2009 12:16
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] Low cost Pickit2 ~ 5$
> 
> Hi, friends,
> 
> The first version of this clone was build on the assumption that all
3v
> devices are 5V tolerant.
> But the case is not like that , i was wrong at that time.
> So i made some changes (see the new schematic in the blog) in the
circuit,
> so it now produce only 3.3v Vhi on digital pins when a 3.3 device is
> connected and 4.05 VHi when a 5V device is connected. So it assures
the
> protection for 3.3 Vhi devices.
> So protection is there and it is possible to debug and burn the pic
now.


I think you have the emitter and collector swapped on Q2 (Vpp
switching).

Regards

Mike

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