Enclosure not stated · 1 knob
Lell EP Parametric EqualizerVerified
Based on the Lell EP Parametric Equalizer
- Category
- EQ / Filter
- Controls
- Volume
- Build
- Vero· 26×22· 46 cuts, 24 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Eq, Lell
From the post
A 3 band parametric eq from the Soviet Union, anyone? Electronic switching is removed and op amp is altered for normal 8 pin DIP package which replaces the odd dual op amp 14 pin DIP package. As for R28 which is connecting across the output of the last op amp and ground, the schematic simply says "100". Could be iether 100 ohm or 100k but 100 ohm seems a bit low?
Upsate 260712. R28 confirmed to be 100k.
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 32 rows
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Check before you build · 2 values the reader of this layout was not sure of
- R28 (horizontal resistor right of IC1, row R): no value on the part, legend says '100ohm or 100k'; entered as 100Ω
- 3K x2 at the right edge (columns 21 and 24): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×11 | 10K | 10k | read from the layout by eye | |
| ×3 | 15K | 15k | read from the layout by eye | |
| ×6 | 470K | 470k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×2 | 3K | 3k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| R28 | 100Ω | 100 | legend: 100ohm or 100k; read from the layout by eye | |
| Capacitors 11 | ||||
| ×1 | 560pF | 560p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×3 | 330nF | 330n | read from the layout by eye | |
| ×2 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | KT3102EM | KT3102EM | Try BC549C, 2N5088 etc.; read from the layout by eye | |
| Q2 | KT3102EM | KT3102EM | Try BC549C, 2N5088 etc.; read from the layout by eye | |
| ICs 4 | ||||
| IC1 | 1458 | 1458 | 1458, 4558, TL072 etc.; KR140UD20 in original; read from the layout by eye | |
| IC2 | 1458 | 1458 | 1458, 4558, TL072 etc.; KR140UD20 in original; read from the layout by eye | |
| IC3 | 1458 | 1458 | 1458, 4558, TL072 etc.; KR140UD20 in original; read from the layout by eye | |
| IC4 | 1458 | 1458 | 1458, 4558, TL072 etc.; KR140UD20 in original; read from the layout by eye | |
| Potentiometers 7 | ||||
| 50-500 Cut/Boost | B10K | B10k | Potentiometer | read from the layout by eye |
| 200-5k Cut/Boost | B10K | B10k | Potentiometer | read from the layout by eye |
| 5k-15k Cut/Boost | B10K | B10k | Potentiometer | read from the layout by eye |
| 50-500 Freq | B100K | B100k | Potentiometer | dual; read from the layout by eye |
| 200-5k Freq | B100K | B100k | Potentiometer | dual; read from the layout by eye |
| 5k-15k Freq | B100K | B100k | Potentiometer | dual; read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |