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3-Band Equalizer DIY Kit

DIY Kits


In Stock

This DIY kit contains all electronics and enclosure materials to assemble a 3-Band Equalizer. The printed circuit board is partially assembled. Simply solder the included capacitors, potentiometers, and jacks to complete the circuit, then install in the included enclosure. 

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  • UK
  • AUS


This fun project has been on the shelf at JDS Labs for more than a year, postponed by long lead times of its high quality film capacitors and rare potentiometers. While you can probably find a software equalizer for your favorite music app, this hardware EQ is fully analog in nature, so it works with every app and avoids digital re-sampling. Kit pricing makes the EQ most affordable.

The JDS Labs 3-Band EQ has a wide adjustment range of about ±15dB for bass, mids, and treble. While the point of an EQ is to color your listening experience, the JDS Labs 3-Band EQ achieves low THD+N with its knobs in their neutral positions.

A muting relay eliminates turn on/off transients, and when the EQ is switched off, the original audio signal passes directly to the RCA output jacks.

3 Band EQ - DIY Assembly Guide
3 Band EQ - Frequency Response Curves


  • THD+N, 20-20kHz 0.0022%
  • Noise (A-Weighted) -104 dBV
  • IMD SMPTE 0.0009%
  • IMD CCIF 0.001%
  • Input Sensitivity >2VRMS
  • Crosstalk (1kHz) -69 dB
  • Bass Control ±16.5 dB
  • Mids Control ±14.9 dB
  • Treble Control ±15.2 dB


  • Case Dimensions (mm) 108.50 x 80.00 x 29.50
  • Case Dimensions (in) 4.27 x 3.15 x 1.16
  • Weight 12 oz


  • Input RCA
  • Output RCA
  • Power 15VAC

Packaged Items

  • 3-Band EQ PCB v1.10 (QTY 1)
  • Aluminum Knobs (QTY 3)
  • Aluminum Enclosure Body (QTY 1)
  • Aluminum Front Plate for EQ (QTY 1)
  • Aluminum Rear Plate for EQ (QTY 1)
  • C1, C5 - BFC237510911, 910pF Film Cap (QTY 2)
  • C3, C6 - FKS2D014701A00KC00, 4700pF Film Cap (QTY 2)
  • C4, C7 - FKP2D006801D00JSSD, 680pF Film Cap (QTY 2)
  • J1 - PJ-002AH (QTY 1)
  • *J4, J5 - PJRAN2X1U01AUX (QTY 2)
  • *RL1 - EC2-12NU (QTY 1)
  • *S2 - 100DP1T2B4M7QE (QTY 1)
  • *VR1, VR2, VR3 - RK09L122002M (QTY 3)
  • *We may ship alternative, equivalent part numbers as inventory changes.

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