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37 lines
954 B
37 lines
954 B
on the patent
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its the Vbe TC that is used.
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on the lm334,
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it's the IC, and an external diode for the TC equalizing (if you use the example circuit later on to
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balance the TC)
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on the patent
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figure 3 is the basic example.
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fig 1 omits the current mirror.
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figure 3 is described in the details section of the patent
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figure 4 or 5 has additional balancing.
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todo: build figure 20, and test to see what kind of current lowering I can get
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todo: build transistor only circuit of this current source, based on schematic in LM334 data sheet.
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might need multiple emitter transistor EDIT: I don't think so. they aren't common in standalone packages.
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only on ic die. and some are not true multi emitter, but just two bonded leads to the same emitter.
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https://en.m.wikipedia.org/wiki/Multiple-emitter_transistor
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article in edn covers what bob pease has for a circuit. similar to ti data sheet with transistor, but drives
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constant current for an led
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