The FSKit - A simple sound card interface for RTTY Frequency Shift Keying
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| Components | Quanity | Description | Vendor | Part Number |
| BOX | 1 | Bud enclosure: HP-3652-B | Mouser | 563-HP-3652-B |
| BT1 | 1 | 4.5 V dc dry battery holder (3 AAA) | Mouser | 12BH431P-GR |
| C1-C3 | 3 | 0.01 uF ceramic capacitor | Mouser | 81-RPER71103K2K1A03B |
| C4 | 1 | 0.1 uF ceramic capacitor | Mouser | 81-RPER71H104K2P1A03 |
| J1, J2 | 2 | 3.5 mm stero phone jack | Mouser | 806-STX-3100-3NB |
| J3-J5 | 3 | RCA phono jack | Mouser | 161-0360E |
| P1 | 1 | Three pin header | junk box | |
| P2, P3 | 2 | Two pin header | junk box | |
| Q1-Q3 | 3 | 2N7000 N-channel MOSFET | Mouser | 512-2N7000D74Z |
| R1, R5 | 2 | 10k ohm, 0.25 watt resistors | Mouser | 291-10K-RC |
| R2 | 1 | 50k ohm trimpot | Mouser | 652-3309W-1-503 |
| R3 | 1 | 1M ohm, 0.25 watt resistor | Mouser | 291-1M-RC |
| R4 | 1 | 10M ohm, 0.25 watt resistor | Mouser | 291-10M-RC |
| T1 | 1 | 600 ohm 1:1 audio transformer | Mouser | 42TL016RC |
| U1 | 1 | Atmel ATTiny45 microcontroller | Mouser | 556-ATTINY45-20PU |
| U2 | 1 | TLC393 comparator | Mouser | 595-TLC393CP |
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