1590B · 2 knobs
Rick Holt VibracasterVerified
Based on the Rick Holt Vibracaster
From the post
Moving on from the Valve Caster, and as recommended by Neil McNasty, here's Rick Holt's Vibracaster.
The tube components are very similar, but the Gain, Tone and Volume controls have been removed and components selected for unity gain and a simple LFO added.
There are lots of mods suggested for this on diystompboxes but I've just based this on the original schematic Rick posted for the 12AU7 tube. The mods should largely be easy to implement if anyone wants to, it's a pretty simple circuit and even with a few extra rows or columns added it should still be 1590B friendly.
When someone builds it will they post a vid on youtube so I can add one to this post. Ta! :o)
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 18 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 1M | 1M | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×2 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 3M3 | 3.3M | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| Capacitors 3 | ||||
| ×2 | 47n | 47n | read from the layout by eye | |
| ×3 | 470n | 470n | read from the layout by eye | |
| ×1 | 1u | 1u | read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | BC547C | BC547C | read from the layout by eye | |
| Q2 | BC547C | BC547C | read from the layout by eye | |
| Potentiometers 2 | ||||
| Depth | B100K | B100k | Potentiometer | read from the layout by eye |
| Speed | B100K | B100k | Potentiometer | read from the layout by eye |
| Other 1 | ||||
| Tube | 12AU7 | 12AU7 | vacuum tube, off board, pins wired to pads 1-8; read from the layout by eye | |