|
|
 |
|
|
|
|
|
This module is a traditional diode ladder low pass filter similar to that in the EMS VCS3, Roland SH-3, System 100 and the PE Minisonic 2. The filter
has a 4-pole ladder with an 18dB like response, thanks to the characteristics of diodes. A fifth pole can be switched in to give a steeper 24dB response using the Slope switch. The control voltages can be smoothed out using the Lag
switch, to give a more fluid modulation.
The filter has adjustable Cutoff Frequency and Resonance, along with a resonance CV input, 2x Signal inputs and 2x Frequency Cutoff CV inputs. The panel design is a mix of rotary and
slide potentiometers. The filter was developed during the heavy snowfalls across the UK in February 2010, hence the name.
EuroRack Module: 18HP wide
User Manual: Download PDF
Our Price: £135.00
Stock Status: In Stock
Availability: usually ship within 5 - 7 days
Product Code: AM8071
|
|
|
Puchase Information:
Click here to request a quote including shipping.
|
|
|
|
|
|
|
|
|
|
|
The core of the filter is a diode ladder with unmatched diodes and high tolerance 100nF Ceramic capacitors, just like the originals from the
1970's. The input and output signals are buffered using standard Op Amps, with a THAT300 quad transistor array at the base of the ladder for signal input and CV control. A THAT340 quad transistor array is used to amplify the
signals at the top of the ladder, and a standard Op Amp circuit is used to control the cutoff frequency of the filter. Resonance is provided by a FET acting as a variable resistor, controlled by a simple potentiometer.
Voltage controlled resonance is available with an external CV input. Two high quality analog switches on the main PCB are switched on and off from the front panel using momentary push buttons. These switch in a 5-pole response using
an additional 100nF capacitor at the base of the ladder and CV lag by means of a 10uF capacitor provides a slewed filter frequency CV response which is essential for the bubbling sounds a diode filter is famous for.
The module has the following front panel controls:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Potentiometers:
Frequency Cutoff, Resonance, QCV, Signal A, Signal B, CV1, CV2
Connections [3.5mm jack]:
Signal A, Signal B, CV1, CV2, QCV, Output
Switches:
1x Momentary action push button [ivory] for SLOPE
1x Momentary action push button [ivory] for LAG
Indicators:
2x 3mm LED in Lens to indicate SLOPE and LAG on and off
Power:
Standard Doepfer 16 way cable to 16 pin power bus
Front panel:
Machined out of 2mm aluminium and colour printed
Dimensions:
18HP width, standard 128.5 mm EuroRack height, 25 mm depth
Current Consumption
30mA +12V and 45mA on -12V
Module Package Contents:
- 1x AM8071 EuroRack Module
- 4x Doepfer compatible 3mm diameter mounting screws
- 1x 300mm Doepfer compatible power lead
- Unique holographic serial number
- 12 month warranty covering product defects
|
|
|
