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Can i make a power supply from 12v ip to 13.2v using a lm7805 and a lm7808?
I would guess the op from the lm7805 would go to the Gnd of the lm7808?
Caps needed Etc?
Darren,
LM78xx is a linear regulator. It can only take a high voltage and make it in to a low voltage. Input current is basically same as output current. Voltage difference is turned into heat.
To increase 12V to 13.2V requires a boost regulator. It outputs more voltage than input voltage, but requires more input current than output current.
How much output current do you need?
Hi Ron,
I think i'm looking for 10ma.
I want to mod the PICPgm USB to also programme HV PICs, so also need a transistor driver a diode setup on the MCLR o/p.
http://picpgm.picprojects.net/hardware/picpgm_usb_v1.0.png
Darren,
The easiest solution is to fill in this information on ti.com web page and click start design.
Darren,
The circuit looks OK.
For the uA78L chain to work there must be a load on VCC. In this case there is a load.