Classi PEQ Filter PCB Passive Equalizer - Configurator

The Classi Filter PCB is a brandnew enhanced quality Filter version to build up a classic passive tube or FET powered equalizer. It supports sweet sounding RM or EF inductors and it has a row to use original EQP-1A inductors as-well. This filter PCB works well together with the Classi PEQ OPA based Gainstage or a G-Pultec tube based power supply as well. It supports all EQP-1A Frequencies and the Frequencies of the G-PEQ as-well. The design supports the finest cap selection of Styroflex and WIMA-MKS4 caps for the filter signal path. This PCB will take your project to the next level. It is an over a long time improved design with love in detail.

Check our Full Gain Stage Kit with all necessary building parts

Features:

• Optimized grounding 
• Easy wiring
• High-Shelf Function
• Reproduction of the classic EQ frequencies plus a wide band of enhanced frequencies that can be used as well.
• Narrow to wide bandwidth control
• Linear Frequency-Spectrum
• Easy to build
• Multiple Channels fit in 1HE enclosure with Classi OPA Gainstage.
• Supports Styroflex and WIMA-MKS4 Caps
• Supported Caps spacings: 5mm 7,5mm and 10mm
• Optional Iron Transformer Output, Lundahl or Edcor
• 2 Layer quality design
• Audiophile signal path design

Provided Frequencies

Low Frequencies:  20Hz, 30Hz, 40Hz, 60Hz, 100Hz (optional 90Hz), 120Hz

High Frequencies:  1K, 1K5, 2K, 3K, 4K, 5K, 8K, 10K, 12K, 14K, 16K

Atten Select:  2K, 5K (optional 4K), 8K, 10K (optional 12K), 16K, 20K

Check our Full Gain Stage Kit with all necessary building parts:



Example Units:


Wiring Instructions in our Blog:
https://www.don-audio.com/Classi-PEQ-Passive-Equalizer-PCB