analog metropolis AM4023 low pass filter, PCB

analog metropolis AM4023 low pass filter, PCB blank (PCBAM4023NONE10) by

analog metropolis AM4023 low pass filter, PCB

Unpopulated PCB for SDIY'ers to create the classic AM4023 low pass filter.

The AM4023 is a clone of the ARP 4023 2-pole 12dB low pass filter in the ARP Odyssey. This filter has a smooth behavior and unlike many 4-pole filters, does not attenuate the low end with increased resonance settings. Also, with a shallower cutoff slope, it could be argued that the Odyssey had a brighter sound overall. The filter is good for bass and bright lead sounds, and with modern components it is not noisy. It will self-oscillate at high Q settings and it can shred speakers – so beware! With so many 4-pole filters around, it’s nice to have a 2-pole version for some contrast. 

The control inputs are calibrated to 1V/octave, and there are up to two CV inputs which have front panel attenuators. There is also an un-attenuated CV in for direct connection to a keyboard or 1V/Octave  input.










The filter frequency has two front panel controls; FREQ for coarse adjustment and FINE for fine adjustment, there is also an on-board trimmer to set the initial cut-off frequency. The filter has a frequency range of 1 Hz to over 20kHz.




The filter has a Q control (RESONANCE) to adjust the resonance of the filter. Higher settings of Q will take the filter into sine wave oscillation. The filter will oscillate from 16Hz to 20 kHz.




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  • $20.00
  • Ex Tax: $20.00

Tags: am4023, pcb analog, metropolis, low, pass, filter, blank, pcbs pcbam4023none10