The hard part to obtain is the Transound capsule. The good news is that as of April 2005 we have a supplier for small quantities - details here.
Also, the 1Gohm resistor (yes, that's 1000 Meg) can be hard to find, and is usually expensive (more than $3 each). If you're looking at a different supplier, check for the 1Gohm resistor first. Mouser does carry them, and Digi-Key sometimes has them as MOX200J-1000ME-ND. I'd recommend the MOX200J if you can get it, since it is the size of a regular 1/4watt resistor.
| Quantity | Part | Description | Mouser | Notes |
| 1 | 2N4416A | FET | 610-2N4416A | 2 | 2N5087 | PNP Transistor | 610-2N5087 |
| 1 | 78-1N5242B | 12V Zener Diode | 512-1N5242BTR | |
| 1 | 6.8K | Resistor | 271-6.8K | |
| 2 | 100K | Resistor | 271-100K | |
| 1 | 330 | Resistor | 271-330 | |
| 2 | 2.2K | Resistor | 271-2.2K | |
| 1 | 1G | Resistor | 588-MOX-750231007F | These tend to be big |
| 1 | 10uf | Electrolytic Capacitor | 140-XAL35V10 | |
| 2 | 0.47uf | 50V Polyester Capacitor | 140-PF1H474K | |
| 1 | 100uf | Electrolytic Capacitor | 140-XAL35V100 |
Original list by Keith Luke, updated by Scott Helmke