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PQ4 Parametric Equalizer
Based on the Boss PQ-4 Parametric Equalizer
- Category
- EQ / Filter
- Price
- €9.75out of stock
From the vendor
A parametric equalizer is the best solution for everyone who needs more flexibility than classic equalizers. We can choose the mid frequency of the filter ourselves and not have to use a predetermined value. It gives almost unlimited possibilities of creating the sound. You can either boost or suppress selected frequencies. The circuit is intended for slightly more advanced DIY builders.
PCB. Dimensions: 62mm x 42mm.
Files to download:
•
Parametric eq PQ-4 ENG.pdf
Schematic
The schematic is in the vendor's build document, page 1. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 74 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 42 | ||||
| R49 | 1k | 1k | ||
| R8 | 1k5 | 1.5k | ||
| R33 | 2k7 | 2.7k | ||
| R34 | 2k7 | 2.7k | ||
| R40 | 2k7 | 2.7k | ||
| R42 | 2k7 | 2.7k | ||
| R18 | 4k7 | 4.7k | ||
| R19 | 4k7 | 4.7k | ||
| R23 | 4k7 | 4.7k | ||
| R24 | 4k7 | 4.7k | ||
| R38 | 6k8 | 6.8k | ||
| R39 | 6k8 | 6.8k | ||
| R1 | 10k | 10k | ||
| R5 | 10k | 10k | ||
| R7 | 10k | 10k | ||
| R10 | 10k | 10k | ||
| R12 | 10k | 10k | ||
| R16 | 10k | 10k | ||
| R17 | 10k | 10k | ||
| R29 | 10k | 10k | ||
| R45 | 10k | 10k | ||
| R47 | 10k | 10k | ||
| R14 | 18k | 18k | ||
| R9 | 22k | 22k | ||
| R11 | 22k | 22k | ||
| R20 | 22k | 22k | ||
| R21 | 22k | 22k | ||
| R26 | 22k | 22k | ||
| R27 | 22k | 22k | ||
| R28 | 22k | 22k | ||
| R30 | 22k | 22k | ||
| R2 | 47k | 47k | ||
| R3 | 47k | 47k | ||
| R25 | 47k | 47k | ||
| R36 | 47k | 47k | ||
| R37 | 47k | 47k | ||
| R44 | 47k | 47k | ||
| R48 | 82k | 82k | ||
| R46 | 100k | 100k | ||
| R0 | 1M | 1M | ||
| R4 | 1M | 1M | ||
| R6 | 1M | 1M | ||
| Capacitors 22 | ||||
| C11 | 47p | 47p | ||
| C20 | 47p | 47p | ||
| C10 | 1n | 1n | ||
| C19 | 1n | 1n | ||
| C5 | 2n2 | 2.2n | ||
| C12 | 6n8 | 6.8n | ||
| C21 | 6n8 | 6.8n | ||
| C13 | 33n | 33n | ||
| C23 | 33n | 33n | ||
| C2 | 47n | 47n | ||
| C6 | 100n | 100n | ||
| C7 | 1u | 1u | ||
| C8 | 1u | 1u | ||
| C15 | 1u | 1u | ||
| C17 | 1u | 1u | ||
| C22 | 2u2 | 2.2u | ||
| C3 | 10u | 10u | ||
| C4 | 10u | 10u | ||
| C9 | 10u | 10u | ||
| C25 | 10u | 10u | ||
| C1 | 47u | 47u | ||
| C16 | 100u | 100u | ||
| Transistors 4 | ||||
| Q2 | BC550 | BC550 | ||
| Q3 | BC550 | BC550 | ||
| Q4 | BC550 | BC550 | ||
| Q1 | BF247 | BF247 | ||
| ICs 3 | ||||
| U1 | TL074 | TL074 | ||
| U2 | TL074 | TL074 | ||
| U3 | TL074 | TL074 | ||
| Potentiometers 3 | ||||
| RV1 | B20k | B20k | ||
| RV2 | C50k | C50k | Dual | |
| RV3 | C50k | C50k | Dual | |