Electronic Tribble, "Fuzzy Logic" Type

Step 3 Construction

First, read all the way through the construction steps so you have an idea of how things go together, then wrangle your parts and tools.

Figure 1 shows the collection of tools and parts you'll need for assembling the Tribble's electronics and Figure 2 shows the collection of tools and parts you'll need for assembling the Tribble's fur fabric case.

Tools
* soldering iron, solder, solder wick
* diagonal cutters
* wire stripper
* needle nose pliers
* X-acto knife
* X-acto saw (only used to cut perf board)
* cloth cutting scissors
* sewing pins
* sewing needle, thread

Parts
* 1 2" by 1.5" patch of G10 perf board with holes on 1/10 inch grid (with or without copper pads on back side)
* 1 3" by 3" plastic "card" (I used the lid to a take-out container) or scrap of G10 board
* 2 3" by 3" squares of copper foil
* 1 SPST momentary close push button switch (needs to be tallest component on circuit board)
* 1 small speaker (~1" dia., 8 Ohm, 100 mW)
* 1 14 pin DIP socket
* 1 4093B CMOS quad 2-input NAND Schmitt Trigger gate IC
* 1 2N2222 npn general purpose transistor (almost any general purpose npn will do)
* 3 22M Ohm resistors (1/4 watt or 1/8 watt, any tolerance -- whatever's cheap and available)
* 1 10k Ohm resistor (1/4 watt or 1/8 watt, any tolerance -- whatever's cheap and available)
* 1 220nF, 10V capacitor (choose small and cheap)
* 1 2.2nF, 10V capacitor (choose small and cheap)
* 1 68pF, 10V capacitor (choose small and cheap) { I had to use 47pF and 22pF in parallel because I did not have 68pF handy }
* 1 terminal with leads for 9V battery
* 1 9V battery
* 22 AWG insulated solid core wire
* a few inches of small insulating tubing (~1/16 inch dia heat shrink or ~1/32 inch teflon)
* small quantity of double-stick foam tape
* polyester batting "stuffing"
* 1 4" by 3/4" Velcro (choose color to match fur)
* 1 9" by 18" patch of suitable fur fabric