Some of these parts are optional, in the sense that the amplifier will work without them. See the Part Selection Guide for advice on choosing which parts to leave out, if any.
I don’t give resistor part numbers because resistors are more or less generic. You should use 1% or better metal film types, but you can pick any kind you like that will fit the footprint on the board. Some of the resistors have specific requirements, covered in their individual part selection guide entries. As for values, the part selection guide also goes into that. If you don’t want to think about those details, just use the ones on the schematic.
| Description | Qty | ID | Digi-Key | Newark | Mouser |
|---|---|---|---|---|---|
| 0.47 µF/50 V polypropylene film and foil capacitor | 2 | C1 | P3888 | – | – |
| Alt. capacitor, 0.22 µF/50 V | 2 | C1 | P3880 | – | – |
| Alt. capacitor, 0.1 µF/50 V | 2 | C1 | P3872 | – | – |
| Alt. 1 µF/16 V PPS film cap, 1210 SMT package | 2 | C1 | PCF1132CT | – | – |
| Long-life electrolytic capacitor, radial | 2 or 3 | C2 | See part guide | ||
| 0.1 µF/50 V ceramic bypass caps, 1206 size | 4 | C3/C5 | 399-1249-1 | – | 80-C1206C104K5R |
| 3.3 µF 50V+ metalized polyester box cap | 2 | C4 | – | 33C9534 | 505-MKS23.3/63/5 |
| Alt. 1.5 µF 63V metalized polyester box cap | 2 | C4 | – | 18C4917 | 505-MKS21.0/63/5 |
| Alt. 1.0 µF 63V metalized polyester box cap | 2 | C4 | 3019PH | 18C4913 | 505-MKS21.0/63/5 |
| 10 pF NP0 ceramic, 0.1" pitch leaded, radial | 1 | C6G | 399-1924 | 08B5882 | 80-C320C100J1G |
| Alt. 10 pF NP0 ceramic, 1206 SMT | 1 or 3 | C6 | 399-1192-1 | – | 80-C1206C100J5G |
| Silicon diode, 50 V 1 A, DO-41 | 2 | D1-D2 | 1N4001FSCT | – | 625-1N4001-E3 |
| Alt. S1A silicon diode | 2 | D1-D2 | S1A-FDICT | – | 621-S1AB-F |
| LMH6321MR SO-8 buffer chips | 3 | BUF* | LMH6321MR | 99K2264 | – |
| Linear regulator, LM317T, TO-220 package, 1.5 A | 1 | IC1 | LM317TFS | 58K8936 | 512-LM317T |
| Alt. linear regulator, TO-92 package, 100 mA | 1 | IC1 | LM317LZ | 82C8151 | 512-LM317LZ |
| Texas Instruments TLE2426CLP (“rail splitter”) | 1 | IC2 | 296-1994 | 88K1249 | 595-TLE2426CLP |
| Op-amp OPA637AP, single | 2 | OPALR | OPA637AP | 96K4529 | 595-OPA637AP |
| Op-amp OPA627AP, single | 1 or 3 | OPALR/G | OPA627AP | 04M6519 | 595-OPA627AP |
| Alt. op-amp OPA2132PA, dual | 1 | OPALR | OPA2132PA | 61M2752 | 595-OPA2132PA |
| Op-amp OPA134PA, single | 1 | OPAG | OPA134PA | 24M5437 | 595-OPA134PA |
| Alt. op-amp AD8620ARZ, dual | 1 | OPALR | AD8620ARZ | 59K6972 | – |
| Alt. op-amp AD8610ARZ, single | 1 or 3 | OPALR/G | AD8610ARZ | 59K6941 | – |
| Alt. op-amp AD843JNZ, single | 1 or 3 | OPALR/G | AD843JNZ | 59K6744 | – |
| Alt. op-amp AD823ANZ, dual | 1 | OPALR | AD823ANZ | 59K6515 | – |
| Stereo mini jack (3.5mm), high quality, non-isolated | 2 | IN/OUT | CP5-43502PM | – | – |
| Alt. stereo mini jack (3.5mm), good quality, non-isolated | 2 | IN/OUT | – | 96F9608 | 502-35RAPC4BH3 |
| Alt. stereo mini jack (3.5mm), good quality, isolated | 2 | IN/OUT | – | – | 161-7300-EX |
| Alt. stereo mini jack (3.5mm), generic, non-isolated | 2 | IN/OUT | CP1-3513 | – | 161-3502 |
| Alt. input jacks (RCA; black, white and red) | 2 | IN | CP-1412 CP-1414 CP-1413 |
84N1165 – – |
161-2003 161-1004 161-2002 |
| Alt. output jack (1/4" stereo), isolated | 1 | OUT | – | 57F3306 | 502-N112B |
| Alt. output jack (1/4" stereo), isolatable | 1 | OUT | SC1123 | – | 502-RN112BPC |
| Alt. output jack, 1/4", locking, isolated | 1 | OUT | – | 46F8572 | 568-NJ3FP6C |
| Volume control | 1 | See part guide | |||
| Volume knob (aluminum; black anodized and silver) | 1 | n/a | 226-1041 226-2041 |
92N4099 92N4096 |
450-7031 45KN031 |
| Alt. volume knob (aluminum, black anodized and silver) | 1 | n/a | 226-1033 226-2033 |
92N4093 92N4095 |
450-7015 450-6015 |
| Power indicator LED, red diffused, 1.8V, 1-5 mA, 3mm | 1 | LED | HLMP1700 | 90F5862 | 512-HLMP-1700 |
| Alt. power LED, low current, green diffused | 1 | LED | HLMP1790 | 87F393 | 512-HLMP1790 |
| Alt. power LED, low current, amber/yellow diffused | 1 | LED | HLMP1719 | 96F2333 34C0661 |
512-HLMP1719 |
| Alt. power indicator LED, clear blue, 4.9V, 2-5 mA, 3mm | 1 | LED | L14006 | – | – |
| Alt. power indicator LED, clear white, 3.6V, 1-5 mA, 3mm | 1 | LED | CMD204UWC | – | – |
| Class-A bias circuit transistor, PNP | 1 | Q1 | 2N5087 | – | 512-2N5087BU |
| Alt. PNP transistor | 1 | Q1 | 2N3906BU | – | 512-2N3906BU |
| Alt. PNP transistor | 1 | Q1 | PN2907BU | – | 863-PN2907AG |
| Class-A bias current transistor, NPN, TO-92 | 3 | Q2,Q3L,Q3R | 2N5088BU | – | 512-2N5088BU |
| Alt. NPN transistor | 3 | Q2,Q3L,Q3R | 2N3904BU | – | 512-2N3904BU |
| Alt. NPN transistor | 3 | Q2,Q3L,Q3R | PN2222BU | – | 863-PN2222AG |
| Cermet multiturn trim pot, Bourns 3296W, 5 kΩ | 1 | RBIAS | 3296W-502 | – | 652-3296W-1-502 |
| Alt. trim pot, Copal CT94EW | 1 | RBIAS | CT94EW502 | – | – |
| Alt. trim pot, Vishay-Spectrol Model 64 | 1 | RBIAS | SP064W-5.0K | – | 594-64W502 |
| DIP-8 IC sockets, gold contacts | 0-2 | n/a | ED90032 | 04M0550 | 575-11043308 |
| Power switch (mini SPST toggle) | 1 | SW | – | 13F3970 | 10TA805 |
| Alt. power switch (mini SPDT toggle) | 1 | SW | 360-1788 | 61F1245 | 612-100-A2311 |
| 5.5/2.5 mm DC power jack, metal shell | 1 | n/a | – | – | 163-2325-E |
| Alt. 5.5/2.5 mm DC power jack, isolated | 1 | n/a | CP-011B | – | 163-4303-EX |
| Molex KK male 2-pin 0.1" header | 2 | S1,WALL | WM4200 | – | 538-22-23-2021 |
| Molex KK female 2-pin shell | 2 | S1,WALL | WM2000 | – | 538-22-01-3027 |
| Molex KK male 3-pin 0.1" header | 1 | INPUTS | WM4201 | – | 538-22-23-2031 |
| Molex KK female 3-pin shell | 1 | INPUTS | WM2001 | – | 538-22-01-3037 |
| Molex KK male 4-pin 0.1" header | 1 | BATT | WM4202 | – | 538-22-23-2041 |
| Molex KK female 4-pin shell | 1 | BATT | WM2002 | – | 538-22-01-3047 |
| Molex KK crimp terminals, 30 to 22 ga wire | 11 | n/a | WM1114 | – | 538-08-50-0114 |
| Power supply (Elpac WM080) | 1 | n/a | – | 16F126 | – |
| Enclosure, Serpac H-65-9V (black, almond, gray, clear blue, clear smoke, clear red, clear green) |
1 | n/a | SRH65-9VB SRH65-9VA SRH65-9VG SRH65-9VTL SRH65-9VTS SRH65-9VTR SRH65-9VTG |
– – |
635-H-659V-B 635-H-659V-A 635-H-659V-G 635-H-659VTR-BL 635-H-659VTR-GY 635-H-659VTR-RD 635-H-659VTR-GR |
| Alt. Enclosure, Serpac H-67-9V (black, almond, gray) |
1 | n/a | SRH67-9VB SRH67-9VA SRH67-9VG |
– – |
635-H-679V-B 635-H-679V-A 635-H-679V-G |
|
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| Updated Fri Dec 16 2022 12:23 MST | Go back to PIMETA v2 Headphone Amplifier | Go to my home page |