optic sensor pulse motor

[jasonspinmaster]

sorry i made a mistake my coil resistance is 10 ohms.  thanks jason

[RunningBare]

sorry i made a mistake my coil resistance is 10 ohms.  thanks jason

The maximum current the base of your TIP120 will see is 12/10000,  0.0012 amps, the TIP120 has a maximum current gain of 1000, that is the collector will load a maximum of 1000x0.0012 = 1.2 amps, with your coil only being 10 ohms its drawing the max, 12/10 = 1.2 amps.

You might want to increase the number of turns on the coil, say double, making it 20 ohms.

There are other ways, but I would need to know your exact configuration.

[jasonspinmaster]

i can not get any more wire, as i do not have the money at the moment.
you say I would need to know your exact configuration
what do you need to know and i will give you the information

[RunningBare]

i can not get any more wire, as i do not have the money at the moment.
you say I would need to know your exact configuration
what do you need to know and i will give you the information

Heres a couple of things you can try, I assume the diode connected to the emitter goes to ground or 0v line, if this is the case then it only serves to reduce gain by dropping about 0.6 volts across it, try bypassing it, secondly reduce the 10k resistor connected to the base to about half the value, the two closest value resistors I know of are 4.7k and 5.1k, you could start with a 6.8k and reduce further if needed, I do not know what your optical sensor is so I recommend you do not drop the resistance below 4.7k, reducing resistance will increase base current and thus collector current.

[nickc44]

THis one should do but I'm looking for a way to bring the power back to the Power batters
to recharge