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2 picoDumbs 2 picoDumbs is offline

diyAudio Member

About Me

  • About 2 picoDumbs
  • Signature
    "If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass


Total Posts
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  • Recent Wiki Activity: 2 picoDumbs has no recent wiki activity
General Information
  • Last Activity: Yesterday 01:39 PM
  • Join Date: 6th September 2013


Latest Blog Entry

Posted 18th December 2015 at 03:36 AM by 2 picoDumbs Comments 0
Posted in Uncategorized
Contained here are all my observations with this amp.

1) The schematic the DIYAUDIO Store PCB is based on does not allow 2nd harmonic adjustment through changing source resistor values.

2) The PCB circuit can be changed to the original degenerating circuit by moving cap leads to other side of resistor lead. This will restore 2nd harmonic adjustment through source resistance modification.

3) Output impedance also appears to be significantly affected (only tested in simulation).

4) As an alternative to the PCB mod, 2nd Harmonic adjustment can be altered on PCB circuit by selecting devices with different transconductance curves if one does not want to modify the PCB.

5) As an alternative to performing transconductance measurements and selecting non-matched devices for 2nd harmonic addition, installing one IRFP250 and one IRFP240 per channel will also give a dominant 2nd harmonic.

Continue reading

Posted 23rd October 2015 at 03:10 AM by 2 picoDumbs Comments 0
Posted in Uncategorized
Testing compression driver
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