Enclosure not stated · 1 knob
Echoplex EP-3 Pre Amp / Aion AresVerified
Based on the Maestro Echoplex EP-3 Preamp· 6 other boards clone it
From the post
Aions Ares project which is based on Echoplex EP-3 Pre Amp which includes an onboard voltage doubler for more headroom. Schematic and info on J FET selection avaiable HERE. 'Note that there is two ground connections on the board, the purpose is to reduce any potential noise from the charge pump. Those wires can be connected to any off board ground points like your audio jacks and DC jack. I also replaced the Drain resistors with trimmers for fine tune the bias.
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 25 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 60Ω horizontal resistor at row P, right of IC1: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×4 | 1M | 1M | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 4.7M | 4.7M | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 60Ω | 60 | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 7 | ||||
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×4 | 22nF | 22n | read from the layout by eye | |
| ×2 | 470nF | 470n | read from the layout by eye | |
| ×2 | 220pF | 220p | 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 | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×3 | 1N5817 | 1N5817 | D1-D3; read from the layout by eye | |
| D4 | 12V Zener | 12V | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N5484 | 2N5484 | JFET; read from the layout by eye | |
| Q2 | 2N5485 | 2N5485 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | ICL7660S | ICL7660S | ICL7660S/TC1044S; read from the layout by eye | |
| Potentiometers 1 | ||||
| Volume | B500K | B500k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×2 | 50K | 50k | read from the layout by eye | |
| Switches 1 | ||||
| Fat | SPDT on/off/on | SPDT ON/OFF/ON | toggle; read from the layout by eye | |
Other boards based on the Maestro Echoplex EP-3 Preamp
- Ares Aion FX · 125B · $12.50
- Ares (Legacy) Aion FX · 1590B
- Multiplex Jr. Delay 1776 Effects · 1590B · $10.00
- E.P.3.0 Five Cats Pedals · 1590B · £4.50
- EP3 Preamp PCBWay: Glory to Ukraine
- Echoplex EP-3 Preamp turretboard.org