1590A · 1 knob
1-band parametriq EQ
- Category
- EQ / Filter
- Controls
- Pegel
- Price
- €4.59in stock
From the vendor
A compact single-supply gyrator EQ that boosts or cuts a tunable centre frequency. Adjustable Q, boost/cut control, and output level — designed for a 1590A enclosure. The 1-Band Parametric EQ is a compact, single-supply gyrator-based equaliser designed to fit inside a 1590A enclosure. Unlike a graphic EQ with fixed frequency bands, a parametric EQ lets you dial in the exact frequency you want to boost or cut, and adjust the bandwidth (Q) to taste — from a narrow surgical notch to a broad shelving lift. The heart of the circuit is a gyrator : a network that simulates an inductor using an op-amp and passive components, without any real inductors. This gyrator forms a resonant LC-style bandpass
Schematic
The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 21 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| R3 | 10k | 10k | VR divider (R13/R14) and summing resistors (R3/R10) | |
| R10 | 10k | 10k | VR divider (R13/R14) and summing resistors (R3/R10) | |
| R13 | 10k | 10k | VR divider (R13/R14) and summing resistors (R3/R10) | |
| R14 | 10k | 10k | VR divider (R13/R14) and summing resistors (R3/R10) | |
| R2 | 1M | 1M | Input pull-down to virtual ground | |
| R4 | 100k | 100k | IC1A input isolation | |
| R5 | 470R | 470 | Gyrator series R — sets L/Q relationship. Do not substitute. | |
| R8 | 250k | 250k | Fixed R in FREQ network | |
| R6 | 33k | 33k | or 56k | 33k = cut only · 56k = boost enabled. See Section 03. |
| Capacitors 6 | ||||
| C1 | 100 μF | 100u | Polarised electrolytic, 5–8mm Ø, 8mm pitch. 47 μF minimum. | |
| C2 | 1 μF | 1u | MLCC or film. Input and output coupling caps. | |
| C4 | 1 μF | 1u | MLCC or film. Input and output coupling caps. | |
| C3 | 10 μF | 10u | Polarised electrolytic, 5mm Ø, 8mm pitch. VR filter. | |
| C5 | 47n | 47n | Box film. Gyrator cap — change to tune frequency range. | |
| C6 | 220n | 220n | Box film. Tank cap — change to tune frequency range. | |
| Diodes 1 | ||||
| D1 | 1N4001 | 1N4001 | Reverse-polarity protection. Cathode stripe toward IC supply rail. | |
| ICs 2 | ||||
| IC1 | TL072 | TL072 | Dual op-amp, DIP-8. Use IC sockets. JRC4558D NE5532 | |
| IC2 | TL072 | TL072 | Dual op-amp, DIP-8. Use IC sockets. JRC4558D NE5532 | |
| Potentiometers 2 | ||||
| +/− | B10k | B10k | Boost/cut. 9mm Alpha or equivalent. B taper (linear in EU/JP convention). | |
| PEGEL | B100k | B100k | Output volume. 9mm Alpha or equivalent. B taper. | |
| Other 1 | ||||
| Q | 5k–10k | 5K–10K | Bandwidth trimmer. ACP 6mm or Piher PT-6. | |