Enclosure not stated · 4 knobs
D*A*M Ezekiel 25:17
Based on the D*A*M Ezekiel 25:17· 6 other boards clone it
- Category
- Bass
- Price
- see vendor
- Also as
- Vero layout · from Revolution Deux
- Tags
- freestompboxes.org trace
From the vendor
David Main's bass distortion for D*A*M: a non-inverting op-amp buffer, then an op-amp diode clipper whose 470R/10uF ground leg amplifies the full bass range (unlike a Tube Screamer's 720 Hz high-pass), a passive filter control and a blend with the clean signal. A four-position rotary switch selects the clipping diodes, from germanium and silicon pairs to LEDs.
The vero suggests a JRC4562D op-amp, or a JRC4558 or similar. The rotary switch is a single-pole, four-throw (a 4-position 3-pole switch with one pole used).
Schematic
The schematic is in the post. Open it at Revolution Deux. 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.
Fixes to the schematic, from the post
- The drawing carries IvIark's correction at the first clipping diode pair: the connection marked with a yellow X is removed and the pair is rewired along the added black line.
Check before you build · 2 values the reader of this schematic was not sure of
- Diode types are not written on the schematic; they are taken from IvIark's vero (D1-D3 germanium 1N34A, D4-D5 silicon 1N4148, D6-D7 3mm LEDs, D8 1N4001).
- The second 470pF cap at the bottom of the switch section is drawn in series with the LED pair; its exact role is unclear.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| R1 | 1M | 1M | read from the schematic by eye | |
| R2 | 220K | 220k | read from the schematic by eye | |
| R3 | 2.2K | 2.2k | read from the schematic by eye | |
| R4 | 100K | 100k | read from the schematic by eye | |
| R5 | 1K | 1k | read from the schematic by eye | |
| R6 | 1M | 1M | read from the schematic by eye | |
| R7 | 470 | 470 | read from the schematic by eye | |
| R8 | 1K | 1k | read from the schematic by eye | |
| R9 | 1K | 1k | read from the schematic by eye | |
| R10 | 100K | 100k | read from the schematic by eye | |
| R11 | 100K | 100k | read from the schematic by eye | |
| Capacitors 11 | ||||
| C1 | 100n | 100n | input; read from the schematic by eye | |
| C2 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C3 | 220n | 220n | read from the schematic by eye | |
| C4 | 2.2n | 2.2n | read from the schematic by eye | |
| C5 | 470p | 470p | read from the schematic by eye | |
| C6 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C7 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C8 | 10n | 10n | read from the schematic by eye | |
| C9 | 470p | 470p | read from the schematic by eye | |
| C10 | 47u | 47u | electrolytic; read from the schematic by eye | |
| C11 | 10u | 10u | electrolytic; read from the schematic by eye | |
| Diodes 6 | ||||
| D1 | 1N34A | 1N34A | germanium; read from the schematic by eye | |
| D2 | 1N34A | 1N34A | germanium; read from the schematic by eye | |
| D3 | 1N34A | 1N34A | germanium; read from the schematic by eye | |
| D4 | 1N4148 | 1N4148 | read from the schematic by eye | |
| D5 | 1N4148 | 1N4148 | read from the schematic by eye | |
| D8 | 1N4001 | 1N4001 | read from the schematic by eye | |
| ICs 1 | ||||
| IC1 | JRC4562D | JRC4562D | dual op-amp; read from the schematic by eye | |
| Potentiometers 4 | ||||
| Blend | B100K | B100k | Potentiometer | read from the schematic by eye |
| Gain | B100K | B100k | Potentiometer | read from the schematic by eye |
| Filter | B100K | B100k | Potentiometer | read from the schematic by eye |
| Level | A100K | A100k | Potentiometer | read from the schematic by eye |
| Switches 1 | ||||
| Distortion flavor | SP4T rotary | SP4T ROTARY | read from the schematic by eye | |
| LEDs 2 | ||||
| D6 | LED | LED | 3mm, clipper; read from the schematic by eye | |
| D7 | LED | LED | 3mm, clipper; read from the schematic by eye | |
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