AMSynths

          High quality analog synthesizer modules

                                About Us   Contact Us   Shipping   Mailing List

AM8109 JP8 Low Pass VCF

This module is replication of the Low Pass Filter from the legendary Roland Jupiter 8 and 4. This is a 2 and 4 pole OTA design that Roland first used in the Jupiter 4 in 1980, replacing a discrete version of the filter which took up more PCB space.

This is a warm sounding filter with smooth frequency control and a resonance that gradually increases up to full self oscillation, a sound very reminiscent of the early 1980's.

The difference between 2 and 4-pole modes is not dramatic, with the 2-pole mode providing a more gradual cutoff slope and silky sound.

EuroRack Module: 14HP wide
User Manual:      Download PDF

Our Price:  £125.00

Stock Status:  In Stock
Availability:  Usually Ships within 5 - 7 days

Product Code: AM8109

Puchase Information:
Click here to request a quote including shipping.

 SoundCloud Demo

 Detailed Description

This module is an accurate reprodution of the Jupiter 8 low pass voltage controlled filter, using the original IR3109 OTA chip in the filter core. The design has been updated to use modern components (such as OTA capacitors and high quality Op Amps). It delivers a very warm and smooth sound.

There are front panel controls for adjusting the Cutoff Frequency and Resonance as well as the level of 2x control voltages and 3x audio signal inputs. Resonance is smooth and controllableto self-oscillation.

There are six 3.5mm jack sockets on the right of the front panel;

• Audio Signal output
• 2x control voltages
• 3x audio inputs.

The slope of the filter can be switched between 2 and 4 poles using a small red push button, and a red LED with lens shows the filter slope selected.

 You Tube Demo

 Technical Specification

Potentiometers:
 Frequency Cutoff, Resonance, CV1, CV2, Signal A, B and C

Connections [3.5mm jack]:
 Signal A, B, C, CV1, CV2, Output

Switches:
 Momentary action push button [red]

Indicators:
 Red 3mm LED in red plastic lens

Power:
 Standard Doepfer 10 way cable to 16 pin power bus

Front panel:
 Machined out of 2mm aluminium and colour printed

Dimensions:
 14HP width, standard 128.5 mm EuroRack height, 80 mm depth

Current Consumption
 30mA +12V and 20mA on -12V

Module Package Contents:

• 1x AM8109 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