| Instrumentation Amplifier (8-pin IC) Operational Amplifier (8-pin IC) Audio Amplifier (8-pin IC) Virtual ground (8-pin IC) | 1 1 1 1 | Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics | 595-INA128PA 296-1410-5-ND 296-44414-5-ND 296-6550-5-ND | Texas Instruments Texas Instruments Texas Instruments Texas Instruments |
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| Capacitors |
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| Capacitor (C1 & C2): 0.022 μF (polyester-film) Capacitor (C3): 22 μF (electrolytic) Capacitor (C4): 2.2 nF (ceramic) Capacitor (C5 & C10): 0.22 μF (polyester film) Capacitor (C6): 0.002: μF (ceramic) Capacitor (C7): 47 pF (ceramic) Capacitor (C8 & C11): 470 μF (electrolytic) Capacitor (C9): 0.047 μF (polyester-film) | 2 1 1 2 1 1 2 1 | Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics | BC1080CT-ND P1177-ND 490-8667-ND 445-8620-ND 1268PH-ND 399-9737-ND P1170-ND BC1082CT-ND | Vishay BC Components Panasonic Murata Electronics TDK Vishay BC Components Kemet Panasonic Vishay BC Components |
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| Resistors |
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| Resistor (R1): 620 Ω 0.6W 1% axial Resistor (R2 & R3): 1 MΩ 0.25W 1% axial Resistor (R4 & R5): 56 KΩ 0.4W 1% axial Resistor (R6): 270 KΩ 0.25W 1% axial Resistor (R7): 10Ω 0.25W 1% axial | 1 2 2 1 1 | Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics | BC4229CT-ND RNF14FTD1M00CT-ND BC3536CT-ND RNV14FAL270KCT-ND 10.0XBK-ND | Vishay BC Components Stackpole Electronics Vishay BC Components Stackpole Electronics Yageo |
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| Sockets |
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| IC socket: 8-pin Connector socket (JP6 in Version B only) Connector header (3 pos male, 2.54 mm) (JP2, JP3, JP4) Connector header (2 pos male, 2.54 mm) (JP1, SPK, BATT) | 4 1 3 3 | Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics Digi-Key Electronics | AE9986-ND 1212-1179-ND Z5650-ND 732-5315-ND | Assmann WSW Preci-Dip Omron Electronics Inc. Wurth Electronics Inc. |
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| Enclosure |
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| Die-cast aluminum enclosure, black powder coating Steel L bracket (to partition PCB/battery bays) Acrylic sheet: 2 mm thick (affix under PCB) Packing sponge (10 mm thick, cut to size as needed) 22 awg solid wire (green - ground from PCB to chassis) | 1 2 — — — | Mouser Electronics Home Depot Amazon.com | 546-1590WP1BK 100375047 10-HS22K6-25 | Hammond Simpson Strong-Tie Circuit-Test |
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| Battery pack |
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| Battery holder AA 6 cell 6" lead JST XH 2.5-2 Pin Male Connector Plug/wire | 1 1 | Digi-Key Electronics Amazon.com | BH26AAW-ND B01DUC1NDM | Memory Protection Devices Daier |
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| Neck-strap fittings |
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| Jig Latch Bolt (1/4 inch thread) 1/4 in. -20 Thread Pitch Chrome Nylon Lock nut 1/4 in. Zinc plated steel internal tooth lock washer 1/4 in. Bonded Sealing Washer | 2 2 2 4 | Guardian Catalog.com Home Depot Home Depot Home Depot | 832850-G 204604732 204276525 204276438 | Gibraltar Products Everbilt Everbilt Everbilt |
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| Probe input |
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| Lemo Female panel-mounted 22 awg solid wire (green - ground, red and black - inputs) | 1 — | BKT Supply Co. Inc Amazon.com | EGG.2K.303.CLL 10-HS22K6-25 | Lemo Circuit-Test |
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| Loudspeaker |
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| Speaker: 8Ω 250 mW, 500 Hz-7.8 kHz, polymer cone JST XH 2.5-2 Pin Male Connector Plug/wire | 1 1 | Digi-Key Electronics Amazon.com | 102-1184-ND B01DUC1NDM | CUI Inc. Daier |
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| Switch |
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| 3-way 3PDT toggle switch Black 1/4-40 switch toggle boot seal Connector socket (3 pos female, 2.54 mm) 22 awg stranded wire (black - ground, red - inputs, green VCC) | 1 2 3 — | Mouser Electronics Mouser Electronics Digi-Key Electronics Amazon.com | 506-MTE306E 506-B1440004 1212-1180-ND FBA_10-HT22K6-25 | TE Connectivity/Alcoswitch TE Connectivity/Alcoswitch Preci-Dip Circuit-Test |
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| Strap |
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| Quick detach swivels 14033 (1 1/4") Yellow polypropylene strap 1" yellow | 1 1 | Walmart.com Craft E-corner | 563509662 115838 | Uncle Mike's Unknown |
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| Probe |
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| Lemo male cable-mounted Cable strain relief thick cable version) Shielded microphone cable 6 mm diameter (2.13 m) | 1 1 1 | BKT Supply Co. Inc Mouser Electronics Amazon.com | FGG.2K.303.CLAC55Z 736-GMA2B060DN B01JNLUA5G | Lemo Lemo AmazonBasics |
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