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The symbol is a circle with an arrow joining the two connections and another arrow in right angle pointing to it.

in scheme of sensor ZK24-2 from Altpro

What is this symbol? I see this symbol in scheme of sensor ZK24-2 from Altpro.

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    \$\begingroup\$ Might be helpful to post the context of the symbol. \$\endgroup\$ – uint128_t Apr 14 '17 at 15:04
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    \$\begingroup\$ If I had to guess, I’d say a voltage-controlled current source. But some context would certainly help. \$\endgroup\$ – user2233709 Apr 14 '17 at 15:07
  • \$\begingroup\$ I agree.VCCS ....... or a CCCS \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Apr 14 '17 at 15:48
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Due Intellectual Property and business reasons, this company does not wish to disclose much details without an NDA. It could be a Hall Effect device with current output due variable reluctance current of rolling train wheels or other magnetic sensor that amplifies current with a transistor.

Regardless it is an obfuscation of how the Current source works except input and output share a common sink unlike the Ebers Mols model in a transistor.

So it could be a CCCS or a VCCS. You want us to guess?

enter image description here

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Without context, it looks like an adjustable constant current source to me: the arrow in the bubble is a constant current source, and the arrow pointing at the bubble is like the wiper part of a potentiometer symbol.

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