All our boards are professionally made by one of the largest board houses in the world.
We use old fashioned terminal blocks, which give a more positive and reliable connection than "push-in" connections.
All our boards are fitted with reverse polarity protection diodes.
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 bench power supply. Some switch mode "wall warts" are quite noisy and we do not advise using them.
The supply voltage can range from 15 to 25VDC with the center pin being positive.
The current draw (around 20ma) is low enough for operation from two 9 volt batteries wired in series. This would ensure a virtually noise free power source.
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