1590B · 1 knob
EHX BassballsVerified
Based on the Electro-Harmonix Bassballs· 5 other boards clone it
From the post
Not sure I missed doing this one ages ago, but better late than never. The Bassballs is a classic envelope filter that's been a staple of Electro Harmonix's line up for a long time. Designed for bass, but works great on guitar as well. Trimmers are very dynamic and might be fun as external pots. Also if it's super loud, adding a volume pot at the output is super easy—remove the 47k resistor off the Out pad, wire the Out pad to lug 3 of an A100k pot, lug 1 to ground, and lug 2 becomes the new circuit output. Here's the schematic for reference. Should fit in a 1590B, though it'll be a tight squeeze.
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 30 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 470nF near the 1458 is drawn as a round can like the electrolytics; printed clearly
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×6 | 47K | 47k | read from the layout by eye | |
| ×1 | 330K | 330k | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×3 | 2.7K | 2.7k | read from the layout by eye | |
| ×4 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 9 | ||||
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 470nF | 470n | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×2 | 4.7nF | 4.7n | read from the layout by eye | |
| ×2 | 56pF | 56p | read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N4148 | 1N4148 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q2 | 2N5088 | 2N5088 | read from the layout by eye | |
| Q3 | 2N5088 | 2N5088 | read from the layout by eye | |
| ICs 2 | ||||
| ×1 | 1458 | 1458 | read from the layout by eye | |
| ×1 | 4558 | 4558 | read from the layout by eye | |
| Potentiometers 1 | ||||
| Response | B10K | B10k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×2 | 10K | 10k | read from the layout by eye | |
| Switches 1 | ||||
| Switch | SPDT on/on | SPDT ON/ON | toggle, lugs Sw1-Sw3; read from the layout by eye | |
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