Step 15: Add the Video Amp
What you need:
2N4401 Amplifying Transistor
33ohm Resistor (Orange-Orange-Black-Gold)
220ohm Resistor (Red-Red-Brown-Gold)
The RF box did more than just turn the composite to RF. It also amplified the video signal. When we took it off, the video signal became weak. We need to build a small video amp to boost the signal.
The second picture explains it all.
SOLDERING THE AMP TOGETHER
Solder one end of the 33ohm resistor to the emitter of the transistor.
Solder the 220ohm resistor to the other end of the 33ohm resistor. That point is your video out. We will connect that to the screen later.
SOLDERING THE AMP TO THE NES
The amp is finished. Clip the leads on the transistor, then solder the base of the transistor to the weak video signal, and the collector to 5v.
All this may sound a little confusing, but pictures 2 and 3 explain it all. Picture 4 has the schematic, if you prefer.
I soldered the resistor leads very close to the transistor, but you may not wish to do this. If you heat the transistor up too much, then it won't work anymore. Feel free to make the circuit on a small piece of perfboard.