NTSC Nintendo 64 RGB Booster (Continued)
This Scart cable already includes a resistor between pins 8 and 16, mmmonkey removed it, and re-used the rubber tubing for the resistor that replaced it. After checking though, the resistor removed was of the correct value anyway. Also notice the loose RGB wires, ready to solder to the constructed circuit.
Before continuing with soldering the rest of the wires, prepare the 2 75 Ohm resistors, bend the resistors so that one fits exactly between pins 8 and 16, the other between 18 and 20. If you've got heat shrink tubing, or kept the stuff that was on the original capacitors/resistors, then cover the resistors as shown (otherwise struggle with electrical insulation tape).
Solder one resistor from Scart pin 8 to pin 16, the second from pin 18 to pin 20.
We're nearly finished. If you're lucky, you wrote down which wires were connected to pins 15 (red signal), 11 (green signal) and 7 (blue signal), use the diagram on the first page and the following picture to see where to solder the RGB wires from the Scart lead to the circuit board (the go next to the negative leg of the capacitors).
Finally, it's time to trim the wires from the circuit board to length (3 or 4 cm should do), and solder them to the Scart pins (trim all the wires before doing any soldering). Start with the 5v wire, solder this to pin 8, in this guide it's the yellow wire.
Now solder the Red, Green and Blue wires to pins 15, 11 and 7 respectively.
Squeeze it all into the Scart plug...
Re-assemble and test/enjoy.
Important Update
mmmonkey noticed that this Scart lead never switched the TV to AV1 automatically, this is because the Scart lead was wired up incorrectly to start with! Look closely at the following photo, you can see an orange wire going to pin 16 (the right hand side of the resistor), this wire should be going to pin 8 (the left hand side of the resistor)
Pin 8 is used to switch your TV onto the correct AV channel when you switch your console on, pin 16 is used to switch your TV into RGB mode. With the scart lead wired up incorrectly as above, not enough current is reaching pin 8, so it may not switch your TV to the correct AV channel.
Again, credit to to Mr. B. and Waltarzar for the original diagram, and to mmmonkey for the design of the tiny Vero Board!
Summary of Components needed
1 x Nintendo compatible RGB
Scart lead
Vero Board (4 tracks by 9 holes)
3 x 100uF 10v Capacitors (your Scart lead may already have these)
3 x BF494 Si-N 260MHz Transistors (have read you can use NTE229 instead)
3 x 1K5 ohm Resistors
2 x 75 ohm Resistors
Selection of short wires
