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What is this circular component with two parallel lines in it? I've never seen this before

enter image description here

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  • \$\begingroup\$ can you share more info.. might be a mic \$\endgroup\$ – User323693 Jun 29 '15 at 4:43
  • \$\begingroup\$ I'm dealing with reaction wheels and this circuit is the ON/OFF telemetry circuit between the reaction wheel and the FPGA. could this symbol mean reaction wheel? @Umar \$\endgroup\$ – Eman alawadhi Jun 29 '15 at 4:45
  • \$\begingroup\$ May be others can get you more exact answer. I feel, it is a sensor of some sort \$\endgroup\$ – User323693 Jun 29 '15 at 4:47
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It is a symbol for DC Voltage.

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    \$\begingroup\$ ... but with the polarity missing... \$\endgroup\$ – jcoppens Jun 29 '15 at 4:50
  • \$\begingroup\$ There's a defined ground point in the circuit, it's a bit sloppy but usually the meaning will be quite clear. \$\endgroup\$ – svens Jun 29 '15 at 4:55
  • \$\begingroup\$ I rather would say (instead of "power supply") DC voltage. \$\endgroup\$ – LvW Jun 29 '15 at 6:38
  • \$\begingroup\$ It's a symbol for dc /power/ \$\endgroup\$ – david Jun 29 '15 at 7:29

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