Enclosure not stated · 1 knob
MXR Noise GateVerified
Based on the MXR Noise Gate· 7 other boards clone it
- Category
- Noise Gate
- Controls
- Sensitivity
- Build
- Vero
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- Gate, MXR
From the post
Geiri has worked his way through with this and he offers couple pointers to enhance it, or to get it working better. So with these mods this one should get this running like intended. (I'll be fixing the layouts tonight..)
1. Important - the 2n3904 (I used 2N5088) must be matched. I made them exactly the same hFE.
2. Change 680R to 4.7K (gets rid of the oscillation problem)
3. The 1M that's going from JFET Gate (the one that goes down to the second last row, change it to 1.8K
I don't think the hFE matters, as long as it's matched. I haven't tried lower hFE. Mine are medium/high.. can't remember
Changing the 1M to 1.8K gets the level back to normal
First, the stock version with only the sensitivity/threshold control (it is called sensitivity in the Tonepad project files):
Then the highly modded one. With added controls for Attack, Release and Attenuation levels. Also, added momentary single pole stomp switch - This one acts as a momentary kill switch for gate.
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 21 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×7 | 1M | 1M | read from the layout by eye | |
| ×4 | 22K | 22k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 680Ω | 680 | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×1 | 1uF | 1u | film; read from the layout by eye | |
| ×3 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 5.1V zener | 5V1 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q3 | 2N5952 | 2N5952 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | JRC4558 | JRC4558 | read from the layout by eye | |
| Potentiometers 1 | ||||
| Sensitivity | A500K | A500k | Potentiometer | read from the layout by eye |
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