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There is not much to say about this as I didn't design it. Go here for schematics, design notes, suggested parts etc:
www.tangentsoft.net/audio/pimeta/
The BUF634U buffers are surface mount so are on the bottom of the PCB. I used a Hammond case and Solarfilm from a model shop to cover it which gives it the shinny look.
Sourcing the parts cheaply was tricky though, this is a summary of the costs and were I got the parts:
| Description |
Qty |
ID |
Source |
Cost in $NZD |
| 3.3 µF 50V+ metalized polyester box cap |
2 |
C4 |
Tangent |
$14 |
| Long-life electrolytic capacitor, radial (I chose Elna Starget Audio capacitors) |
2/4 |
C2/C3 |
|
$32 |
| 10pF NP0 ceramic, 0.1" pitch, radial |
1 |
C6 |
Local eg. DSE, Jaycar |
$1 |
| Texas Instruments TLE2426CLP ("rail splitter") |
1 |
TLE2426 |
RS Componets |
$9 |
| Op-amp OPA227PA , dual |
1 |
OPALR |
Tangent |
$25 |
| Op-amp OPA2227P , single |
1 |
OPAG |
Tangent |
$12 |
| BUF634P DIP-8 buffer |
3 |
U3 |
Tangent |
$25 |
| PIMETA PCB |
|
|
Tangent |
$12 |
| Volume control, ALPS RK27 "Blue Velvet", 50K |
1 |
VOL |
Tangent |
$23 |
| Hammond case |
1 |
- |
South Island Components |
$25 |
| Resistors, cable, connectors, postage etc |
- |
- |
Local eg. DSE, Jaycar |
$47 |
| |
Appox Total |
$225 |
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