In my last post, I had run into an obstacle on my Mad Monster Candy Snatch build.
A singular reply to my plea for help got me on the right track, verifying that I was correct to have soldered new wires to the speakers and pointing out that I could determine the polarity of the wires by looking more closely at the speaker itself.
Although no one had been able to explain how to wire everything up to the transistor, I finally figured it out!
I apologize for the vertical video below, but I was so excited that I got my monster to work that I didn't pay attention!
Here is how I finally got it to work:
1. Identify the BCE legs of your transistor and set it aside. I labeled mine.
2. Solder a second pair of wires to the Radio Shack speaker. (This direction was missing from the ones in the magazine, although the pictures on their website clearly show the addition of extra wires.) If you look closely at the top of the speaker, you'll be able to determine which wire is positive and which is negative.
3. After wiring the LEDs in parallel (I connected one 12-inch wire to the negative legs and another 12-inch wire to the positive legs), I soldered one end of the resistor to the end of the positive wire. I then soldered the positive lead of the second battery to the other end of the resistor. (This is the second battery, not the one connected directly to the speaker.)
4. Solder the negative wire attached to your LEDs to the C leg of your transistor.
5. Solder the positive wire from your speaker to the B leg of your transistor.
6. Solder the negative wire from your speaker and the negative lead of the second battery to the E leg of your transistor.
7. Follow the magazine's directions for connecting the alligator clips to the monster and to the wires that you soldered to the speaker.