Enclosure not stated · 4 knobs
The GristleizerVerified
Based on the Gristleizer· 1 other board clones it
- Category
- EQ / Filter
- Build
- Vero· 21×26· 39 cuts, 20 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Chris Carter, Filter, Modulation, Noise, Roy Gwinn, Throbbing Gristle, Tremolo
From the post
Quite wild voltage controlled modulation and filter circuit by Roy Gwinn dated back in 1975. The most famous user was probably Chris Carter from Throbbing Gristle.
Some mods have been done for this layout to make more compact and reduce ticking and hiss which is a common problem. Many thanks should go to mictester from FSB and Fuzzdog.
Original had five LM741 single op amps which is merged into a quad and a dual op amp. The dual op amp is in the audio signal path so low noise devices is used like NE5532 or LM833. The quad op amp handles the LFO and a LM324 is reported to have the lowest noise from ticking.
Other mods includes a higher value of resistor connecting to pin 2 of IC1 for higher input impendance and Level control value is reduced from 100k to 10k.
More info about setting the trimmers, schematics and even more mods at FSB , MusicPCB
and Fuzzdog Pedal Parts
The layout is verified and working really good although there is still some faint ticking, especially in square wave mode.
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 38 rows
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Check before you build · 2 values the reader of this layout was not sure of
- D1, D2: legend says only 'Germanium' (try 1N4148/1N914), no part number
- IC2: legend says only 'Quad op amp', LM324 is the suggestion
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 6.8K | 6.8k | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 18K | 18k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×9 | 47K | 47k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×3 | 180K | 180k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 4.7M | 4.7M | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×2 | 6.8nF | 6.8n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 470nF | 470n | legend: increase to 680nF-1uF for slower LFO; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | Germanium | GERMANIUM | Germanium; try 1N4148/1N914; read from the layout by eye | |
| D2 | Germanium | GERMANIUM | Germanium; try 1N4148/1N914; read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N3819 | 2N3819 | JFET; 2N3819 or other J FET; read from the layout by eye | |
| Q2 | 2N3906 | 2N3906 | read from the layout by eye | |
| Q3 | 2N3904 | 2N3904 | read from the layout by eye | |
| ICs 3 | ||||
| IC1 | 1458 | 1458 | 1458, 4558 etc.; try LM833, NE5532 for less hiss; read from the layout by eye | |
| IC2 | LM324 | LM324 | Quad op amp; try LM324 for less ticking; read from the layout by eye | |
| IC3 | ICL7660S | ICL7660S | read from the layout by eye | |
| Potentiometers 4 | ||||
| Speed | A10K | A10k | Potentiometer | read from the layout by eye |
| Bias | B100K | B100k | Potentiometer | try 100kC; read from the layout by eye |
| Depth | B10K | B10k | Potentiometer | read from the layout by eye |
| Level | B10K | B10k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| Offset | 100K | 100k | read from the layout by eye | |
| Shape | 100K | 100k | read from the layout by eye | |
| Switches 2 | ||||
| VCF/VCA | DPDT on/on | DPDT ON/ON | toggle; read from the layout by eye | |
| Shape | 3P4T rotary | 3P4T ROTARY | rotary: ramp up, ramp down, triangle, square; read from the layout by eye | |
Other boards based on the Gristleizer
- Gristleizer - Mad Modulations! Fuzz Dog · 1590BB · £55.20