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In Reply to: RE: Has anyone used LM317 as constant current source posted by Triode_Kingdom on April 15, 2025 at 16:47:27:
Yes you can. I used a modified version as a tail impedance for a 6SN7 LTP in the input stage of my mono-blocks. However, if you are passing more than 10mA a simple cascode 8N100D2 will work very well and is easier to implement. The change I made to the MJ's BJT CCS was to replace the resistor that supplied current to the bias string for the BJTs with a DN2530/LM334 (temp. com. @2mA) CCS. Replacing the resistor with a current source was suggested by Walt Jung in an article as a way to enhance performance for this CCS.
Leo, for some reason wants to use a -100V neg. PS. With BJTs the top transistor will be required to handle more voltage than the 30V BC549C. The higher voltage device will have lower current gain which will decrease the impedance and performance of the current source.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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- RE: Has anyone used LM317 as constant current source - JKT 18:46:40 04/16/25 (0)
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