Frankenbear Synthamajig using PIC16F877 microcontroller
Go get stuff.
1 – Small white teddy bear (preferably with red bow)
1 – USB cable
1 – Bicycle safety flasher
1 – Small speaker
1 – PIC16F877 micro-processor
1 – 20MHZ ceramic resonator
1 – LM386 audio amplifier
1 – 40 pin socket
1 – 8 pin socket
1 – PCB (cut to size of teddy bear)
2 – 10K potentiometers (preferably with knob)
2 – red knobs (available at Home Depot)
2 – 0.1uF ceramic disk capacitors
1 – 0.022uF ceramic disk capacitor
1 – 330uF electrolytic capacitor
1 – 10uF electrolytic capacitor
1 – 0.1uF polyester film capacitor
2 – 220 ohm resistors
1 – 10K resistor
1 – 330 ohms resistor
1 – Spool red thread to match bear
1 – Role of electrical tape
1 – Red and black 22 AWG wire
– PIC programmer
– Exacto knife or razor blade
– Soldering iron
– Hot glue gun
– Sewing needle
– Wire cutter
– Needle nose pliers
– Drill (possibly)
– Small philips head screwdriver (possibly)
Disassemble and carefully destroy the flasher.
The first thing we’re going to do is open up the flasher and remove the circuit board. This should be easy.
Next, we are going to deactivate the flasher.
The flashing feature is deactivated because I simply didn’t want it to blink. If you want to keep yours blinking, remove the button and solder a wire to each terminal where the button used to be on the board (and then skip the rest of this step as well as the next).
If you want to keep yours from flashing, go get your drill. Determine where the chip is on the board. It probably will look like a black dot, which is really a protective coating to keep people from tampering with it (see secondary picture below). Locate the dot and then drill through it until it is gone. This hole should also be enough of a precaution to break all unnecessary wiring connections.
Rewire the LED flasher.
Gut the bear.
Once the back of the neck is open then you can pull out all of the stuffing from the bear’s head and stomach. To aid in re-stuffing later, leave in the stuffing in the arms and feet.
There is something strangely rewarding about unstuffing the bear.