Enclosure not stated · 5 knobs
May I? Vox in a BoxVerified
Based on the May I? Vox in a Box· 1 other board clones it
- Category
- Preamp / Amp-in-a-box
- Build
- Vero· 20×15· 19 cuts, 8 links
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- Amp Emulation, Distortion, Overdrive
From the post
Thought i'd post this here too in case someone wants to try it out. There's an old development thread on FSB for this AC30 emulation circuit. There are number of schematic versions with slight differences, but the basics are the same for all of them. It is a nice high gainer with some noise content, so i'd suggest using 220µ for the power filter and maybe adding a 100p cap between germanium transistor's base and collector. I built one to see if the layout works and it's good to go.
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 35 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
- Q3/Q4 type: legend prints BF248A clearly, unusual part number (BF245A is the common JFET)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×2 | 10K | 10k | read from the layout by eye | |
| ×2 | 68K | 68k | read from the layout by eye | |
| ×1 | 1.5K | 1.5k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 3.9K | 3.9k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| Capacitors 11 | ||||
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 6.8nF | 6.8n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; 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 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| D2 | 1N34A | 1N34A | or similar Ge; read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | NPN Ge | NPN GE | legend: Q1 is NPN Ge; read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q3 | BF248A | BF248A | JFET; or similar JFET, like 2N5457 or J201; read from the layout by eye | |
| Q4 | BF248A | BF248A | JFET; or similar JFET, like 2N5457 or J201; read from the layout by eye | |
| Potentiometers 5 | ||||
| Drive | B10K | B10k | Potentiometer | read from the layout by eye |
| Bass | B1M | B1M | Potentiometer | read from the layout by eye |
| Treble | B1M | B1M | Potentiometer | read from the layout by eye |
| Cut | B50K | B50k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| ×1 | 100k | 100k | read from the layout by eye | |
| ×1 | 10k | 10k | read from the layout by eye | |
Other boards based on the May I? Vox in a Box
- May I? Effects Layouts (blog)