Enclosure not stated · 5 knobs
May I?Verified
Based on the May I? Vox in a Box· 1 other board clones it
- Category
- Preamp / Amp-in-a-box
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Amp Emulator, Overdrive
From the post
Got a request for this one. Another AC30/Rangemaster emulator to try and get Brian May's tone. Here's the schematic for reference. It calls for "BC245/256" JFETs for Q3-4, but I think that's a typo and should have the BF prefix. Should work with other JFETs as well. So socket and experiment with the usuals—J201, 2N5457, etc.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 36 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- Pot named 'Gain' on the board but 'Drive: A10k' in the legend; taken as the same pot
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×2 | 10K | 10k | read from the layout by eye | |
| ×2 | 68K | 68k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 1.5K | 1.5k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 3.9K | 3.9k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| Capacitors 11 | ||||
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 6.8nF | 6.8n | read from the layout by eye | |
| ×2 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| D1 | germanium | GERMANIUM | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | NPN germanium | NPN GERMANIUM | read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q3 | N-channel JFET | N-CHANNEL JFET | JFET; read from the layout by eye | |
| Q4 | N-channel JFET | N-CHANNEL JFET | JFET; read from the layout by eye | |
| Potentiometers 5 | ||||
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Treble | A1M | A1M | Potentiometer | read from the layout by eye |
| Cut | B50K | B50k | Potentiometer | read from the layout by eye |
| Gain | A10K | A10k | Potentiometer | legend calls it Drive; read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
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