[EMAIL PROTECTED] wrote: > Jim, > > Most audio amplifiers have a large capacitor on the output to block DC > current. DC is not good for speakers. Class D power amps use PWM based > drivers that might work for driving motors. I am not sure but I don't > think they have the caps on the output. You would have to look at the > specs for audio amp to try and identify what class amp is being used on the > output stage.
I originally ran my Bridgeport on a small stereo amp I built years ago. I had to bypass a circuit that provided the DC blocking function at the input of the amp. It was basically a VERY boosted Op-Amp, so ideal for the purpose. I later adapted some evaluation designs for class-D audio amps to make better servo amps. My current line of servo amps are essentially the output stage of that design, but with digital inputs. > I think you might be better off building your own VFD driver. Especially > if the PWM is being done though HAL. Why not try using the stepper driver > H bridge and drive it directly from HAL running in PWM mode. As long as > it's heat sinked, you should just fine. The L298 just might work well for > this. I have run a 2-phase spindle motor off a Gecko 201, although it didn't have the right V/F curve to deliver much power. International Rectifier has a bunch of reference design kits for various VFD-type applications. Just throwing out some ideas, because it isn't real clear what the OP wants to do. Jon ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
