evandude
New Member
I just built a little board to generate the 13v necessary for PIC programming from a 5v input. I attached SCH and BRD files for cadsoft eagle 4.14
it's a switched-capacitor voltage converter, using a MAX1683 chip (which can be had as free samples from maxim), 4 10uF capacitors, and a few diodes. the overall board size came out to be about 0.6" by 0.75"
and no, it's nothing special, it's just the circuit from a maxim app note, with a zener regulator attached to the output. I just designed it because I have a USB PIC programmer that requires a 16VDC input, (which it then regulates down to 12.6v) which is hard to come by, and I'd much rather power the whole thing directly off the USB port since it's capable of supplying plenty of current.
The circuit is only good to one or two dozen mA, so it should ONLY be used for the 13v programming voltage; the rest of my programmer will be powered directly from the USB port. perhaps it could come in handy for other programmers as well, since you could feed the programmer with a very wide range of voltages if the input went into a 5v regulator, and then into this circuit.
it's a switched-capacitor voltage converter, using a MAX1683 chip (which can be had as free samples from maxim), 4 10uF capacitors, and a few diodes. the overall board size came out to be about 0.6" by 0.75"
and no, it's nothing special, it's just the circuit from a maxim app note, with a zener regulator attached to the output. I just designed it because I have a USB PIC programmer that requires a 16VDC input, (which it then regulates down to 12.6v) which is hard to come by, and I'd much rather power the whole thing directly off the USB port since it's capable of supplying plenty of current.
The circuit is only good to one or two dozen mA, so it should ONLY be used for the 13v programming voltage; the rest of my programmer will be powered directly from the USB port. perhaps it could come in handy for other programmers as well, since you could feed the programmer with a very wide range of voltages if the input went into a 5v regulator, and then into this circuit.