GTDT amp BoM
- Kits are available from IEEE — contact the current IEEE representative, listed on the resources page.
- The BoM is split into two parts. The first is the the PCB and components — everything for the amplifier circuit. There's not much substitution possible — f you want to build this amp, these are the minimum requirements. In principle, you could stop with just the PCB, leaving it naked. Connect a power supply, speakers, and a source, and the amp will work just fine.
- The second part has the peripherals — an enclosure and connectors — needed to make a finished project. As is often the case, the external parts are more expensive than the basic electronics. For these external parts, there is opportunity for using cheaper alternatives depending on what can found in your project drawer at home and how creative you want to be.
- Of course, a power supply is essential. It is included in the list of optional parts because you may already have a supply available. Just make certain that it can provide 18 V DC or 12 V RMS. If you don't have a supply that will work, then buy one of the transformers listed.
- Here is a csv file of the BoM that can be uploaded directly to DigiKey for speedier ordering. This file lists only the components for the PCB. If you want to include any of the optional parts, be sure to add them to the file using a text editor.
| item | Manufacturer p/n | Digikey p/n | quantity | item cost | total |
|---|---|---|---|---|---|
| TL082 op amp | TI TL082CP | 296-1780-5-ND | 1 | 0.69 | 0.69 |
| Socket | Assmann AR 08 HZL-TT | 123-AR08-HZL-TT-ND | 1 | 0.50 | 0.50 |
| 10-kΩ resistors | Stackpole CF14JT10K0 | CF14JT10K0CT-ND | 3 | 0.10 | 0.30 |
| 150-kΩ resistors | Stackpole CF14JT150K | CF14JT150KCT-ND | 6 | 0.10 | 0.60 |
| 330-nF capacitors | TDK FG14X7R1H334KNT06 | 445-173139-1-ND | 3 | 0.34 | 1.02 |
| 3.3-μF capacitors | TDK FG26X7R1H335KRT06 | 445-173440-1-ND | 2 | 0.73 | 1.46 |
| 3300-μF capacitors | Nichicon UVZ1E332MHD | 493-1307-ND | 3 | 1.04 | 3.12 |
| npn BJT | onsemi MJE182G | MJE182GOS-ND | 2 | 0.64 | 1.28 |
| pnp BJT | onsemi MJE172G | MJE172GOS-ND | 2 | 0.65 | 1.30 |
| 15-V regulator | STMicro L7815CV | 497-1454-5-ND | 1 | 0.68 | 0.68 |
| diode bridge | Diodes Inc DF01M | DF01MDI-ND | 1 | 0.46 | 0.46 |
| red LED | Cree C5SMF-RJF-CT0W0BB1 | C5SMF-RJF-CT0W0BB1-ND | 1 | 0.17 | 0.17 |
| screw terminal - 3 | On Shore OSTVN03A150 | ED10562-ND | 2 | 1.23 | 2.46 |
| screw terminal - 2 | On Shore OSTVN02A150 | ED10561-ND | 1 | 1.08 | 1.08 |
| PCB | Available from IEEE. | 1 | 2.50 | 2.50 | |
| Total | 17.62 | ||||
| item | Manufacturer p/n | vendor p/n | quantity | item cost | total |
|---|---|---|---|---|---|
| box | Serpac 032C,BK | DigiKey SR032-CB-ND | 1 | 11.74 | 11.74 |
| 1/8" stereo jack | CUI SJ1-3515 | DigiKey CP1-3515-ND | 1 | 1.82 | 1.82 |
| barrel jack | MPD EJ501A | DigiKey EJ501A-ND | 1 | 2.02 | 2.02 |
| speaker connections | GC Electronics 33-1404 * | Jameco 2123469 | 1 | 1.65 | 1.65 |
| 12-V RMS transformer ** | Reliapro ADU120150E1012 | Jameco 167151 | 1 | 12.95 | 12.95 |
| Total | 30.18 | ||||
* For some reason, DigiKey no longer supplies the speaker connections. They are still available from Jameco. (And they are cheaper there, too. So take that, DigiKey.)
** Alternate transformer from Digikey: Triad WAU12-1500, Digikey number 237-1879-ND, $17.42.