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Two PCB's to build the AM8003 (SH03 Filter). This is a clone of the Diode ladder low pass filter in the Roland SH-3 monophonic analog synthesizer that dates from the very early days of Roland. It was launched in 1973 along with the preset SH-1000. The filter is an "EMS" style diode ladder low pass VCF. The design is very close to that used in the EMS VCS3 and AKS and it has the traditional diode filter characteristics.The AMSynths circuit is exactly the same as the original with the additional of signal input and output buffers to integrate the filter into a modular setup.The circuit uses Mylar Film 68nF and 22nF capacitors in the filter ladders, and they should be matched to within 1%. The diodes should be matched to within 2 mV. Matching the diode in the SH-3 filter is important to minimize CV feed through, which can be significant in a diode ladder.
We sell a Hard to Find Kit for all the components that are tricky to source.Euro Rack Module: 14HP wide Project Notes: Download PDF Hard to Find Kit: Link is here
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