The following is a parts list to help with collecting everything needed to build the TNC.
I created this list from the diagram. Send me any corrections/additions in Email.
| Quantity | Part Desc. | Notes |
| 1 | PIC16F88 | U1- PIC controller |
| 1 | 78L05Z | U2- 5 volt regulator |
| 1 | MAX232 | U3 - RS232 to 5 volt level converter |
| 5 | 0.1 uf | C3, C4, C5, C6, C7 - Monolithic capacitors |
| 4 | 1 uf/25v | C8, C9, C10, C11 - electrolytic capacitors |
| 1 | 220uf | C12 - power supply filtering |
| 1 | 100 uf | C13 - power supply filtering |
| 2 | 30 pf | C1, C2 - not needed if using a ceramic resonator |
| 3 | 1N4148 | D3, D4, pwr feed - Signal diodes |
| 1 | color LED | D1 - Receive data indicator |
| 1 | color LED | D5 - Transmit data indicator |
| 2 | 10k | R7, R13 - resistors |
| 4 | 1k | R1, R5, R8, R11 - resistors |
| 2 | 2k | R2, R9 - resistors |
| 1 | 3.9k | R3 - resistor |
| 1 | 8.2k | R4 - resistor |
| 1 | 100k | R6 - resistor |
| 1 | 470 | R10 - resistor |
| 1 | 10K variable | R12 - miniature potentiometer |
| 1 | crystal/ceramic resonator | Y1- resonator. Ceramic resonators have the caps built-in. Crystals require external caps. |
| 1 | 2N2222A | Q1 - PNP transistor |
| 1 | DB9 | J1 - serial port connector |