Enclosure not stated · 3 knobs
Tone Factor Cream PieVerified
Based on the Tone Factor Cream Pie
From the post
A small Germanium Booster/OD.
Original using NPN Germanium Transistors.
Since PNP Germaniums are more readily available, cheaper, and reliable here's a PNP version. Remember you can NOT daisy chain this with NPN devices.
And here's a layout that's a touch larger, but includes an onboard inverter to give you the ability to daisy chain it.
Suggested hfe for the transistors is between 90-120hfe. The trimmer is used to set the collector voltage. Suggested between 3-5V, with a lower voltage giving a dirtier boost. You can replace it with an offboard pot to allow for on the fly adjusting, like the layout below.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 12 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 2 | ||||
| ×1 | 3.3M | 3.3M | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 4 | ||||
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 68nF | 68n | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | OC140 | OC140 | NPN Germanium (Try OC140, AC187, MP38A, etc.); read from the layout by eye | |
| Potentiometers 3 | ||||
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Gain | B5K | B5k | Potentiometer | read from the layout by eye |
| Tone | A500K | A500k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| VR1 | 50k | 50k | read from the layout by eye | |