Hi
I am new to electronics and have run into a problem with one of my first projects and am hoping someone can offer advice.
I have built a simple voltage regulator using a LM317 and a variable pot. The output of the LM317 is connector to the base of the 2N6277 power transistor. I have connected a LED to the emitter of the transistor to check everything is working. So far all works great. I have also checked with a multimeter and I get behaviour as I expect. Led switches on and off and voltages are what they should be.
Now comes the tricky bit. This is all powered by a 12V 100aH lead acid battery (Overkill, I know but I wanted lots of juice). When i replace the LED with a DC motor (which requires lots of juice) and connected in the same way as the LED I cannot get the motor to turn over. The multimeter shows correct voltage changes when i change the variable pot but nothing else happens.
The motor is 9.6 volt RS540SH motor. When connected directly to the battery (i.e. at 12 volts) it runs without a problem. As soon as I step the voltage down to 9.6 volts with the LM317, nothing happens. Turning the variable pot up to full (i.e. giving about 11 volts) also does nothing.
The motor needs about 9.6 volts and about 8 amps, the transistor should be able to supply this easily and the battery by itself has no problem at all.
What am I missing?
TIA
Neville
I am new to electronics and have run into a problem with one of my first projects and am hoping someone can offer advice.
I have built a simple voltage regulator using a LM317 and a variable pot. The output of the LM317 is connector to the base of the 2N6277 power transistor. I have connected a LED to the emitter of the transistor to check everything is working. So far all works great. I have also checked with a multimeter and I get behaviour as I expect. Led switches on and off and voltages are what they should be.
Now comes the tricky bit. This is all powered by a 12V 100aH lead acid battery (Overkill, I know but I wanted lots of juice). When i replace the LED with a DC motor (which requires lots of juice) and connected in the same way as the LED I cannot get the motor to turn over. The multimeter shows correct voltage changes when i change the variable pot but nothing else happens.
The motor is 9.6 volt RS540SH motor. When connected directly to the battery (i.e. at 12 volts) it runs without a problem. As soon as I step the voltage down to 9.6 volts with the LM317, nothing happens. Turning the variable pot up to full (i.e. giving about 11 volts) also does nothing.
The motor needs about 9.6 volts and about 8 amps, the transistor should be able to supply this easily and the battery by itself has no problem at all.
What am I missing?
TIA
Neville