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AM8105

Analog Metropolis
Part Number AM8105
Manufacturer Analog Metropolis
Description Super JX VCF & VCA Project Notes
Published Apr 22, 2015
Detailed Description Analog Metropolis AM8105 Super JX VCF & VCA Project Notes V1.0 © Analog Metropolis 2014 Rob Keeble Contact: info@amsynth...
Datasheet PDF File AM8105 PDF File

AM8105
AM8105

Overview
Analog Metropolis AM8105 Super JX VCF & VCA Project Notes V1.
0 © Analog Metropolis 2014 Rob Keeble Contact: info@amsynths.
co.
uk Web Site: www.
amsynths.
co.
uk 30 May 2014 AM8105 Module – Super JX VCF & VCA 1 Module Description This module is a clone of the 24dB Low Pass Filter and Voltage Controlled Amplifier in the Roland JX-8P.
The circuit is based around the Roland IR3R05 chip which first appeared in the MKS80 REV5 replacing the IR3109 and CEM3360, and then made its way into the JX-8P, MKS70, JX10 and Alpha Junos.
The filter and VCA was usually followed by a 1-pole High Pass Filter in these polyphonic analog synthesizers.
The IR3R05 was the final analog filter chip designed by Roland, prior to the arrival of digital filter technology in 1985 and the D50.
The 14-pin DIL chip contains two 2-pole State Variable Filters configured as a 4-pole Low Pass filter only.
The chip has external capacitors with two internal VCA; one for voltage controlled Resonance and one as the final VCA in the ...


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