Check for LM338K, or LT1083
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Check for LM338K, or LT1083
Last edited by mister_e; - 30th April 2009 at 12:14.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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current control with PWM
Connect the HPWM output of a PIC to a low pass filter to develop a variable DC voltage. Use that DC value on the base of a power NPN transisitor configured as an emitter follower current amplifier. With the emitter connected to ground, and your load between the collector and your positive supply, you can vary the collector current with the PWM. Just remember to set the "knee" of your low pass filter to about 1/10th to 1/5th of your PWM output frequency. You might also consider putting a high wattage sense resister between the emitter and ground and reading the voltage on the emitter with the A/D of the PIC for some feedback.
The less you expect, the more you get.
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