All of our boards are fitted with reverse polarity protection diodes. This is can be especially useful for students and can reduce the chance of damaged circuits.
The power jack takes the popular 2.1x5.5mm plug.
Although well filtered, due to the very low voltages audio voltages being measured we recommend the use of a linear bench power supply. Some switch mode "wall warts" are quite noisy and we do not advise using them.
The supply voltage is a maximum of 30 volts with the center pin being positive. All of our PCBs have an on-board rail-splitter for providing a +/- supply to the OP AMP.
The current draw (less than 20ma) is low enough for operation from two 9 volt batteries wired in series. This would ensure a virtually noise free power source.
Our boards are available in easy to build kit form complete with all parts, but are also available pre-built and tested on special order.
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