9/2/2013: RoHS has changed a lot of the parts. I found a good-enough FET for the time being, PF5102.
1/2/2012: Updated list quite a bit. Resistor part numbers might be a bit stale; just use a nice 2% tolerance metal film.
Transsound capsules can be purchased from JLI Electronics: 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 | PF5102 | FET | 512-PF5102 | 2 | 2N5087 | PNP Transistor | 610-2N5087 |
| 1 | 78-1N5242B | 12V Zener Diode | 512-1N5242B | |
| 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 | MOX200J-1000ME-ND | |
| 1 | 100uf | Electrolytic Capacitor | 647-TVX1V101MAD | |
| 2 | 0.47uf | 50V Polyester Capacitor | 140-PEI2A474J-RC | |
| 1 | 10uf | Electrolytic Capacitor | 647-TVX1H100MAD |