Delay time through power amp? - diyAudio
 Delay time through power amp?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Solid State Talk all about solid state amplification.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 5th March 2010, 01:16 AM #1 diyAudio Member     Join Date: Jan 2010 Location: Midwest U.S.A. Delay time through power amp? Using global feedback there is some delay between the time the signal appears on the first active device and the time the global feedback reaches the feedback active device. Do you all with the simulators or any of the rest with real circuits have values for delay times? Am getting like 4µs through a 130 watt/8 ohm power amp and wonder how this compared? Thanks to all for thoughts and info.
 6th March 2010, 04:09 AM #2 diyAudio Member   Join Date: Oct 2008 A rough estimate Consider the whole amp as a single pole filter..yes, it's a very rough approximation...anyway... for frequencies below the three dB frequency, the delay of a single pole filter is 1/(2*pi*f3db). As an example, if the amplifier were 3 dB down at 50000 Hertz, then its delay below 50000 Hertz would be about 1/(2*pi*50000)=3.18 microseconds.
diyAudio Member

Join Date: Jan 2010
Location: Midwest U.S.A.
Quote:
 Originally Posted by djoffe Consider the whole amp as a single pole filter..yes, it's a very rough approximation...anyway... for frequencies below the three dB frequency, the delay of a single pole filter is 1/(2*pi*f3db). As an example, if the amplifier were 3 dB down at 50000 Hertz, then its delay below 50000 Hertz would be about 1/(2*pi*50000)=3.18 microseconds.
So I have two stages in the amp. The input stage and the emitter follower output stage. The input delay is 2.1µs from input through to the last gain stage output and the double emitter follower output stage is 1.9us. Hummmm.

Thanks for the input. I know there is delay in the device which apparently needs that time added in. The open loop bandwidth of the amp is 85kHz at -3dB with a gain of 95dB. That would be 1.8µs,

Obviously I need to do more testing with other circuits including this new output stage which uses much faster transistors...150mHz outputs and drivers instead of the old 4mHz ones. That will surely be faster.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post cbutterworth Tubes / Valves 24 31st August 2011 12:53 PM LinuksGuru Tubes / Valves 57 16th January 2010 11:22 AM thedman Solid State 2 2nd November 2007 12:22 PM back Analog Line Level 18 1st March 2006 08:01 AM mart34 Subwoofers 14 15th August 2004 11:19 PM

 New To Site? Need Help?

All times are GMT. The time now is 11:56 AM.