I also need to switch between the two resistors frequently (every minute or so), so I would need a computer-controlled switch. Any ideas on what kind of switch/relay could to the job? I only have a data acquisition card that can output up to 10 V but only 5 mA maximum (and of course USB ports, if they can be of any use). The maximum output of the power supply is 10A / 20V, but during the switching the output voltage and current is brought to zero. The transition time is not critical. Is there anything on the market I cn buy for this? Or, if I need to build a circuit, can you please tell me where I can find the circuit diagram (I have only little experience with electronics). Thank you very much.
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