Be sure to insulate the ends of the resistor with heat shrink so that it does not short out. The green (gnd) wire and the yellow wire are soldered across the resistor. Pin 8 is the cathode the resistor will be attached between the top and the base. It and all other pins except pin 8, get wired straight through to the base. Pin 3 is the plate, solder the red wire to it. sizes up to ½”ĮDIT: Test lead construction and wiring diagram Hand drill and assortment of bits in std. Tube top (fits with base to make probe ends) - Part Number C8CĤ – 8 Pin Octal. Short pieces of heat shrink tubing in assorted small sizes (from ½” to 1/8”)Ĥ – 8 Pin Octal. Avoid teflon insulated wire - the teflon insulation makes it is hard to work withĢ – plastic strain relief plugs for meter leads 22 gauge 600v rated stranded wire in different colors (ex. Use a cheap set because you will cut the test probe end offģ – 8’ pieces of. plastic project box (approximately 2 ¾” x 4”)Ĥ – black rubber feet (adhesive type or ones with a screw hole through center)Ģ – Voltmeter test leads – make sure these match the type used by your meter

Bias guitar amp without probe