1590B · 3 knobs
Greer Amps LightspeedVerified
Based on the Greer Amps Lightspeed· 9 other boards clone it
From the post
Wondered about this one for a while (but always suspected it was YATS). The best way to describe the Lightspeed (that I can think of anyway) is it's kind of like a Timmy with the bass and treble controls fixed and a simple treble cut tone control added just before the volume pot. The most interesting thing with this is the clipping, with 5 diodes in asymmetrical orientation (3 going one way, 2 going the other). Should fit in a 1590B or 125B nicely with board mounted pots.
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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 20 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 430K next to the 47nF left of the IC: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×3 | 5.6K | 5.6k | read from the layout by eye | |
| ×3 | 4.7K | 4.7k | read from the layout by eye | |
| ×2 | 3.3K | 3.3k | read from the layout by eye | |
| ×1 | 3.9K | 3.9k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 430K | 430k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×1 | 470nF | 470n | read from the layout by eye | |
| ×1 | 1uF | 1u | box film; read from the layout by eye | |
| ×2 | 22uF | 22u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×5 | 1N4148 | 1N4148 | printed 4148; read from the layout by eye | |
| ×1 | 1N5817 | 1N5817 | printed 5817; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | OPA2134 | OPA2134 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | A500K | A500k | Potentiometer | read from the layout by eye |
| Freq | A10K | A10k | Potentiometer | read from the layout by eye |
| Loudness | A100K | A100k | Potentiometer | read from the layout by eye |
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