More details on the protype Signal Tracer I built using a 741 Op Amp as a High Impedance Buffer Amplifier followed by a LM386 Audio Amplifier to drive a small 8 Ohm Speaker.

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Required Components
R1 - Resistors 1/4W Metal Film 10M
R2 10M
R3 10M
R4 51 OHM
R5 390 OHM
R6 10 OHM
C1 (16V) Electrolytic 470 µF
C2 (2KV) Ceramic 220 pF
C3 (630V) Polyester Film or Equivalent 0.001 µF
C4 (50V) Electrolytic 4.7 µF
C5 (100V) Polyester Film 0.039 µF
C6 (16V) Electrolytic 470 µF
C7 (16V) Electrolytic 470 µF
C8 (100V) Polyester Film 0.047 µF
C9 (100V) Polyester Film 0.033 µF
D1 - Germanium Diode 1N34A
B10K Dual Linear Taper 6 Pins
IC1 - DIP-8 UA741CN
IC2 - DIP-8 LM386
8 Pin DIP IC Sockets Solder Type (Optional) x 2 DIP IC
Nylon M2 Threaded MF Standoff Spacer 12mm
Plastic Vial w/ Snap Cap 40 Dram
9V Battery (1200 mAh) recommended EBL
9V Battery Clip Clip
5mm White LED DC 3V 20mA (Design at 15mA) Chanzon
28 AWG Hookup Wire or Shielded Audio Wire HW
Silicone Rubber or Other Insulating Material
2W 40mm Diameter 8 Ohm Speaker Uxcell
Insulated Test Lead (Black or Green) ~20" Length
4x6CM Double-Sided Prototype Board
Rubber Grommets (Assorted Sizes) HF
SPDT Slide Switch 3mm 0.5A 50V x 2 Uxcell
PCB Screw Terminal Block Connector 3.5mm Pitch Uxcell
3/32" x 0.014" Brass Tubing K&S
5/16" x 0.014" Brass Tubing K&S
Foam or Other Spacer to Support Speaker
Glue or Epoxy
Various Hand Tools
Velcro 3/4" W x 1.5" L
Paper Clip
Heat Shrink (Various Sizes)
Small Nylon Cable Tie (Ground Wire Strain Relief)
Grille Cloth 2" x 2" (Optional)

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