Put a resistor from the current supply to ground. Calculate the value so 20mA works out to 5v (or your PIC operating voltage). This will work for a hobbyist ... if you need high "product"quality, then use an op amp to buffer it.
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Put a resistor from the current supply to ground. Calculate the value so 20mA works out to 5v (or your PIC operating voltage). This will work for a hobbyist ... if you need high "product"quality, then use an op amp to buffer it.
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