My build blog for my active 3 ways.
3 way post #2 - the amp circuit
Posted 9th November 2009 at 08:59 PM by relder
Updated 9th November 2009 at 10:29 PM by relder (Update title)
Updated 9th November 2009 at 10:29 PM by relder (Update title)
Here is the basic circuit for the amps. Turn the pot in one direction and it acts like a current source. Turn it the other direction and it behaves like a voltage source -- almost, you still have that 0.5 ohm series resistor there, so output impedance will always be at least that.
It's stable on the bench with a fixed R and with real speakers.
The adjustability will allow me to:
It's stable on the bench with a fixed R and with real speakers.
The adjustability will allow me to:
- Tone things down at woofer resonance (you'd have a big peak at Fs if driven totally like a current source)
- Act somewhat like an adjustable Linkwitz transform for the woofer (around that resonance peak again)
- Control phase somewhat (if I recall right there is a 90deg phase change between current and voltage driven)
- Adjust frequency response somewhat, depending on the impedance plot
- Adjust distortion (less is better but compromises with the above must be made)
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