Hey Hey! I got a good “after Christmas” deal from Target: an RC airplane for $35 (the original price is $50). The issue is that the airplane charger base needs 8 D-size batteries. To save buying 8 D-size batteries, I tried to connect a 12V 500mA AC-DC transformer to the positive and negative metal contacts. It worked! Pretty amazing.
To my curiosity, I tried to use another AC-DC transformer (9V 1000mA) to the charger base. Then, I started to smell very strange odors and the light of the charger base went off. I destroyed the charger base. 😦
To not give up, I opened the charger base and checked the circuit board. A 16V/100uF capacitor was blown up. I hurried up to Fry’s and bought a new capacitor ($1.07). After going home, I removed the bad capacitor and soldered the new one to the circuit board.
After the repairment, the most important thing came. I reconnected the first AC-DC transformer to the charger base, and turned on the switch. Bingo! The light of the base went on. It worked again!
This was the greatest achievement I got on Jan 1st, 2007. 🙂