AMSynths AM2140 Resonant Filter (MOTM)
fully assembled analog metropolis am2140 resonant filter, in motm format
from rob keeble:
"This module is a clone of the Resonant Filter in the Eµ Systems Modular.
The Resonant Filter is an audio filter with an output capable of producing virtually any two pole pass characteristic. The FREQUENCY control can be varied from 20Hz – 20 kHz, and a resonant peak may be added in the response by means of the Q control. The height of the peak can be adjusted from zero to +40dB.
The filter has three functions; Low Pass,
An output mixer sums the simultaneous three filter functions to produce a single output, and three attenuators (
There is a signal input and output on the front panel, as well as an internal CV input on the board.
The original Eµ Systems 2140 is a basic filter with no external CV control of Q or FREQUENCY. There was a firmware CV for FREQUENCY on the board, which was typically connected to the 2145 Filter Controller which enabled multiple 2140’s to be voltage controlled.