TPA3122 Class-D amp BoM
- Kits are available from IEEE — contact the current IEEE representative, listed on the resources page.
- This BoM is for the PCB and circuit only. The amp can be used in a "bare board" fashion, but putting the board into an enclosure with proper power and audio connections is better. A description for making the "Audio Club Standard Box" will be forthcoming.
- Also, a power supply is required. The circuit was designed with the intention of using a 12-V RMS transformer, but an 18-V DC supply will also work. IEEE stocks some 12-V transformers, and you can obtain one from them. Here are links to transformers from Jameco and Digi-Key, if you want to order your own. Note that the same transformer works for the GTDT desktop amp as well.
- From Jameco: Jameco Reliapro 167151, $10.49
- From DigiKey: Triad WAU12-1500, DigiKey number 237-1879-ND, $18.74.
| item | Manufacturer p/n | Digikey p/n | quant | item cost | total |
|---|---|---|---|---|---|
| Class-D amp | TI TPA3122DN | 296-23375-5-ND | 1 | 4.14 | 4.14 |
| 20-pin Socket | CNC Tech 245-20-1-03 | 1175-2553-ND | 1 | 0.46 | 0.46 |
| 15-V regulator | STMicro L7815CV | 497-1454-5-ND | 1 | 0.54 | 0.54 |
| diode bridge | Diodes Inc DF01M | DF01MDI-ND | 1 | 0.58 | 0.58 |
| red LED | Lite-On LTL-4211 | 160-1955-ND | 1 | 0.19 | 0.19 |
| 3300-μF capacitor | Nichicon UVZ1E332MHD | 493-1307-ND | 1 | 1.10 | 1.10 |
| 470-μF capacitors | Panasonic ECA-1HM471B | 10-ECA-1HM471BCT-ND | 4 | 0.68 | 2.72 |
| 10-μF capacitor | TDK FG18X5R1E106MRT06 | 445-FG18X5R1E106MRT06CT-ND | 1 | 0.46 | 0.46 |
| 1-μF capacitors | TDK FG18X7R1E105KRT06 | 445-173261-1-ND | 4 | 0.31 | 1.24 |
| 0.68-μF capacitors | TDK FA24X7R1H684KRU06 | 445-180639-1-ND | 2 | 0.55 | 1.10 |
| 0.22-μF capacitors | Vishay K224K20X7RF53L2 | K224K20X7RF53L2-ND | 3 | 0.51 | 1.53 |
| 0.1-μF capacitors | Vishay K104K15X7RF5TL2 | BC1084TR-ND | 3 | 0.25 | 0.75 |
| 22-μH inductors | Bourns RLB0912-220KL | RLB0912-220KL-ND | 2 | 0.36 | 0.72 |
| 10-kΩ resistors | Stackpole CF14JT10K0 | CF14JT10K0CT-ND | 4 | 0.10 | 0.40 |
| 4.7-kΩ resistors | Stackpole CF14JT4K70 | CF14JT4K70CT-ND | 2 | 0.10 | 0.20 |
| 1-kΩ resistor | Stackpole CF14JT1K00 | CF14JT1K00CT-ND | 1 | 0.10 | 0.10 |
| 2-position header pins | Harwin M20-9990245 | 952-2261-ND | 4 | 0.12 | 0.48 |
| jumpers | Sullins QPC02SXGN-RC | S9337-ND | 4 | 0.10 | 0.40 |
| 3-pos screw terminal | On Shore OSTVN03A150 | ED10562-ND | 2 | 1.26 | 2.52 |
| 2-pos screw terminal | On Shore OSTVN02A150 | ED10561-ND | 1 | 0.87 | 0.87 |
| PCB | Available from IEEE. | 1 | 1.50 | 1.50 | |
| Total | 22.00 | ||||