hello,
the following two attached constant current circuits posted at this forum worked wonderfully. I now want to build a low current (1-5 mA) source that must be able to drive up to high voltages, typically100V. How do i go about it? The LM317 has minimum current=10mA , i may use LM317LZ to obtain current=5mA but then also i am limited to 37V , how do i obtain 100V? Do i connect a buffer stage to boost the voltage but still the same current or is a totally new design is needed? The data has been carefully checked and is final.
the following two attached constant current circuits posted at this forum worked wonderfully. I now want to build a low current (1-5 mA) source that must be able to drive up to high voltages, typically100V. How do i go about it? The LM317 has minimum current=10mA , i may use LM317LZ to obtain current=5mA but then also i am limited to 37V , how do i obtain 100V? Do i connect a buffer stage to boost the voltage but still the same current or is a totally new design is needed? The data has been carefully checked and is final.
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