Programmer

From Chiip-Wiki

Building the programmer

We will now build a programmer called SP12. The advantage of this programmer is that you don't need any external power supply because it's powered by the parallel port.

	This is the schematic of the programmer X is the D-SUB 25 connector; X-5 for example means pin 5 of the connector ICS1 is one of the IC sockets - mind the notch! R1-R7 are the 220 ohm resistors C1 is the electrolytic capacitor; mind the polarity - there will probably be one side marked with a "-", this side must connect to the GND line on pin 25 on the D-SUB 25 connector
	For your help, this is the pin numbering of the D-SUB 25 connector, looking at the backside (where you have to solder to).

I built my programmer right into a standard D-SUB 25 case.

This step is just to improve the appearance of the programmer, and is a bit fiddly too. Check out the User Pics page to get a few ideas on how others did it, you'll see some very creative ideas!

This is how I did it:

	I used a Dremel to cut two large parallel holes into the case, 7.54 mm apart
	I placed the IC socket on the case so the pins go through the holes. Then I fixed the IC socket with some glue
	I cut off all pins I didn't need
	I soldered all wires to the correct pin; this is the programmer right before I closed the case
	And this is how it looks like once the case is closed