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I received a box full of old electronic components and the pictured DC motor was in it (4 pins labelled as '+' '-' and 'P', 'P'). I would like to know what are the 'P' labelled pins for. Thanks in advance

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Probably "pulse" for a tachometer output (which may be used for a control input.)

Put a scope on it with the motor running.

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  • \$\begingroup\$ Thanks @Ecnerwal, I've done it last night and it gave me outputs around: for white pin 0.8v, brown pin = 13v. If I force a slow down in the motor, white pin goes up and brown pin goes down. So it would be for a Tachometer output. It suggest you can control the speed by modifying input voltage according to the out of these pins \$\endgroup\$
    – trox
    Jun 23, 2016 at 18:05

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