Enclosure not stated · 6 knobs
Sovtek MIG 100HVerified
Based on the Sovtek MIG 100H
- Category
- Preamp / Amp-in-a-box
- Build
- Vero· 21×21· 35 cuts, 9 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Amp Emulator, Pre Amp, Sovtek
From the post
Another generous contribution by Sebastian, this time a Sovtek MIG 100H amp emulator! The Acorn MIGFET post inspired me to whip up this layout for a version of the MiG 100H, which is more like a hot-rodded JCM800 than the pseudo-Plexi MiG 50. An interesting variation in its own right.
I've not built this myself yet, since I'm out of 100k trimmers and A1M pots, so due diligence is encouraged. I've attached the amp schematic for scrutiny. The layout follows the circuit pretty much 1-to-1 until the phase inverter. One half of the phase inverter is used, then the output stage is pilfered from the Menatone Foxy Brown (I've found it great in various AIAB builds, so it should do the trick here too). The master volume is moved to the end of the circuit.
Like the JCM800, the MiG 100H has two channels with separate inputs, the lower-gain of which skips the first stage of the preamp. This layout has a footswitch to toggle between the two channels for (hopefully) added utility.
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 40 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×1 | 100R | 100 | read from the layout by eye | |
| ×1 | 470R | 470 | read from the layout by eye | |
| ×1 | 1k | 1k | read from the layout by eye | |
| ×1 | 2k2 | 2.2k | read from the layout by eye | |
| ×2 | 2k7 | 2.7k | read from the layout by eye | |
| ×1 | 4k3 | 4.3k | read from the layout by eye | |
| ×2 | 4k7 | 4.7k | read from the layout by eye | |
| ×1 | 6k8 | 6.8k | read from the layout by eye | |
| ×1 | 10k | 10k | read from the layout by eye | |
| ×1 | 33k | 33k | read from the layout by eye | |
| ×1 | 47k | 47k | read from the layout by eye | |
| ×1 | 68k | 68k | read from the layout by eye | |
| ×1 | 82k | 82k | read from the layout by eye | |
| ×1 | 220k | 220k | read from the layout by eye | |
| ×5 | 470k | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| Capacitors 13 | ||||
| ×1 | 10p | 10p | read from the layout by eye | |
| ×1 | 220p | 220p | read from the layout by eye | |
| ×1 | 330p | 330p | read from the layout by eye | |
| ×3 | 470p | 470p | read from the layout by eye | |
| ×1 | 2n2 | 2.2n | read from the layout by eye | |
| ×1 | 4n7 | 4.7n | read from the layout by eye | |
| ×2 | 10n | 10n | read from the layout by eye | |
| ×3 | 22n | 22n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×3 | 100n | 100n | read from the layout by eye | |
| ×1 | 470n | 470n | read from the layout by eye | |
| ×1 | 1u | 1u | drawn as a film box, not a can; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N5819 | 1N5819 | read from the layout by eye | |
| Transistors 1 | ||||
| ×6 | BF245A | BF245A | Q1-6: DSG pinout JFET (BF245A, PN4393, etc.); read from the layout by eye | |
| Potentiometers 6 | ||||
| Pre | A1M | A1M | Potentiometer | read from the layout by eye |
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Master | A1M | A1M | Potentiometer | read from the layout by eye |
| Treble | A500k | A500k | Potentiometer | read from the layout by eye |
| Mid | B10k | B10k | Potentiometer | read from the layout by eye |
| Presence | B5k | B5k | Potentiometer | read from the layout by eye |
| Trimmers 2 | ||||
| ×2 | 50k | 50k | read from the layout by eye | |
| ×4 | 100k | 100k | read from the layout by eye | |
| Switches 1 | ||||
| Channel Switch | DPDT | DPDT | stomp footswitch; read from the layout by eye | |