UcD amp cant shut off by pulling the tail current - diyAudio
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Old 5th April 2006, 12:52 PM   #1
zilog is offline zilog  Sweden
diyAudio Member
Join Date: Oct 2005
Default UcD amp cant shut off by pulling the tail current

I have a UcD amplifier built similar to a schematic I found on the net with standard configuration of the tail pair. As I understand, it should be possible to control the on/off state of the amplifier by letting the bottom end of the tail pair float or not compared to VSS. For my amplifier, this causes one of the output devices to switch at some frequency - and thereby pump the bus at an enormous rate.

Anyone else had this weird problem with an UcD?
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Old 5th April 2006, 01:05 PM   #2
zilog is offline zilog  Sweden
diyAudio Member
Join Date: Oct 2005
Never mind, fixed it now - my implementation of the control pulled both emitter resistors and center resistor in the diff pair - the working version pulls only the center resistor.
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