Assembling the Dragon Rider 500 for use with the AVR Dragon

Step 12 PSU Add-On

The PSU add-on can be assembled in a couple of configurations. I decided to go with the option that allows for an adjustable voltage power supply.

1. Secure the voltage regulator to the board and solder it in place.

• Place the heat sink over the copper pad on the PCB so that the mounting hole lines up with the hole in the PCB.
• Place the voltage regulator in the heat sink so that it's mounting hole also lines up.
• Use a pencil to mark the leads where they need to be bent at a 90 degree angle.
• Use a pair of pliers to make a clean, 90 degree bend in the leads.
• Place the head-sink and regulator over the board, add the screw and tighten the bolt to hold everything in place. Circuit boards are basically glass so do not over-tighten.
• Solder the three leads of the voltage regulator in place and clip the excess.

2. Place the remaining components.

• Be careful to align the two electrolytic capacitors correctly. The black stripe marks the negative lead (cathode). The board has a "+" next to hole for the anode.
• Insert the LED at LED1 being cautious of its polarity just like with the LED add-on kit.
• Insert the trim-pot at R5
• Insert the switch at SW1
• Insert the power jack at J32

3. Solder all components and clip the leads.

• The solder joints for the power jack also act as mechanical fasteners so make sure you have loaded the holes up with adequate solder.