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 Post subject: PICPgm USB - HVP?
PostPosted: Sat Sep 27, 2014 4:16 pm 
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Joined: Sat Sep 27, 2014 4:10 pm
Posts: 4
With the PICPgm USB Programmer, if i added an external 13v to the MCLR pin, would i be able to programme HV Pics?

Any input would be grateful. :?:


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 Post subject: Re: PICPgm USB - HVP?
PostPosted: Wed Oct 01, 2014 5:33 pm 
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Joined: Fri Oct 28, 2011 5:18 pm
Posts: 225
Hi,

yes, but you need to use the MCLR output of the programmer to switch the 13V via a transistor. Directly applying 13V to the MCLR pin will destroy the programmer.
And since a transistor is an inverting switch, you have to invert the MCLR pin control in PICPgm in the hardware settings.

Regards,
Christian


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 Post subject: Re: PICPgm USB - HVP?
PostPosted: Wed Oct 01, 2014 7:23 pm 
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Joined: Sat Sep 27, 2014 4:10 pm
Posts: 4
Hi Christian,

Do you have a circuit diagram to explain further to do so?

Dizzwold.


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 Post subject: Re: PICPgm USB - HVP?
PostPosted: Fri Oct 10, 2014 6:51 pm 
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Joined: Sat Sep 27, 2014 4:10 pm
Posts: 4
Hi Christian.

Is this what you mean?

Sorry about the size of the attachment.

Dizzwold.


Attachments:
PICPGM.png
PICPGM.png [ 54.81 KiB | Viewed 12129 times ]
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 Post subject: Re: PICPgm USB - HVP?
PostPosted: Sun Oct 12, 2014 8:10 pm 
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Joined: Fri Oct 28, 2011 5:18 pm
Posts: 225
Hi,

your solution will not work, your transistor will alwas be switched on, i.e. high voltage will always be on the output.
Use the schematic below.
This is a non-inverting switch, so you could keep the standard PICPgm USB programmer settings in the software.

Regards,
Christian


Attachments:
picpgm_usb_high_voltage.png
picpgm_usb_high_voltage.png [ 21.64 KiB | Viewed 12109 times ]
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 Post subject: Re: PICPgm USB - HVP?
PostPosted: Tue Oct 14, 2014 2:27 pm 
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Joined: Sat Sep 27, 2014 4:10 pm
Posts: 4
Hi Christian,

Thank you for your input and advise.

Very grateful.

Dizzwold.


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