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A preamplifier is basically a bunch of connectors, volume control and a buffercircuit. With the modules we present here, we provide these buffercircuits with a built in Voltage Controlled Amplifier (VCA) with exceptional wide ranges and with way lower tolerance than a regular potentiometer can do. Attenuation/gain can be set by a 0-4,8V dc voltage and/or by an SPI controlled dual DAC, depending on the model in 4096/1024/256 steps. By connecting a cheap DVM display module, the dB level can be read as well.
All boards listed below are pin and size compatible. They are DIY kits, so you need to assemble, solder and test them yourself and save money. They all fit on our Preamplifier modules.