T
Terry Pinnell
- Jan 1, 1970
- 0
I was hoping to finish off this little stereo amplifier today. It's a
very simple design based on two LM380s, and I've placed it in the same
case as my existing multi-purpose bench unit (which contains various
preamps and mono power amps). It shares its 13.3V regulated DC supply
but nothing else apart from accommodation.
http://www.terrypin.dial.pipex.com/Images/StereoAmp1.gif
But I get nasty distortion (on both channels), whenever input
amplitude (at jack socket) exceeds the very modest level of about
700mV.
http://www.terrypin.dial.pipex.com/Images/DistortionMusic.gif
http://www.terrypin.dial.pipex.com/Images/DistortionSine.gif
I've done a fair bit of checking but so far can't see whatever the
obvious cause is!
BTW, why is the 'polarity' of the distortion pulses different for
those two cases of sine versus music please?
very simple design based on two LM380s, and I've placed it in the same
case as my existing multi-purpose bench unit (which contains various
preamps and mono power amps). It shares its 13.3V regulated DC supply
but nothing else apart from accommodation.
http://www.terrypin.dial.pipex.com/Images/StereoAmp1.gif
But I get nasty distortion (on both channels), whenever input
amplitude (at jack socket) exceeds the very modest level of about
700mV.
http://www.terrypin.dial.pipex.com/Images/DistortionMusic.gif
http://www.terrypin.dial.pipex.com/Images/DistortionSine.gif
I've done a fair bit of checking but so far can't see whatever the
obvious cause is!
BTW, why is the 'polarity' of the distortion pulses different for
those two cases of sine versus music please?