991 Filter and attenuator.

The Fitzgreyve 991 Filter and Attenuator is a passive module containing a switched low pass filter, a switched high pass filter, and an attenuator.

The low pass filter cut-offs are:
1. 16 Hz
2. 41 Hz
3. 159 Hz
4. 482 Hz
5. 1591 Hz
6. No filter/bypass

The high pass filter cut-offs are:
1. No filter/bypass
2. 16 Hz
3. 41 Hz
4. 159 Hz
5. 482 Hz
6. 1591 Hz

The module was designed to use vintage Mullard C280 “tropical fish” capacitors, but PCB pads have been provided for alternate capacitors.

• Module is passive
• 30 mm Depth

Module is available as a DIY project only.

This Module is currently available.