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what is for "CURRENT REGULATOR DIODE"?
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001:
what is for "CURRENT REGULATOR DIODE"?  |O
Can I replace 1N5303 with some transistor circuit?

I see https://en.wikipedia.org/wiki/Constant-current_diode but how to calculate values?  :-//
rstofer:
The current limiting diode attempts to provide a constant current flow over a large voltage range.  If you need a current source, this is one way to get it.

I'm not going to do the math but it seems like you can achieve the same thing with a zener diode and transistor and maybe even just a transistor.  Or substitute an LED for the zener  diode.

https://en.wikipedia.org/wiki/Current_source#Simple_transistor_current_sources

Zero999:
It's just a J-FET with its gate tied to the source and is selected to give 1.6mA.
https://www.mouser.co.uk/datasheet/2/68/1n5283-5314-43522.pdf

You can make your own with a J-FET. Most J-FETs have a higher current than 1.6mA, with zero gate voltage. To get such a low current, you'll have to connect the source in series with a resistor. J-FETs have a wide spread of characteristics, so the resistor value to get 1.6mA will have to be determined experimentally.
exe:
These are not on sales anymore :( But discrete jfets are still possible to buy, though there are not that many around.
Benta:
1N5303 is available from several suppliers:
Central Semiconductor, Digitron, Microsemi...
You can make current regulator diodes yourself from JFETs, but the current spread is huge (1:3 or more).
The "ready made" types are within +/-10%, much easier.
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