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From Sine Wave To Triangle Waveform |
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Elliot Thompson 
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Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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 Topic: From Sine Wave To Triangle WaveformPosted: 14 January 2017 at 5:39pm |
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I was measuring the output voltage of an amplifier's high frequency roll-off under an 8 ohm load and received this result once I approached 50 kHz...
 What would create such an outcome? Best Regards, |
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Elliot Thompson
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DjLeco
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Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817 |
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Posted: 14 January 2017 at 6:05pm |
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Poor bandwith
Poor slew rate. Put one printscreen with 10kHz rectangular measurement with 8 ohms dummy load resistor as load.
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I'm A Stupid SMART Romanian...
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Elliot Thompson
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Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Posted: 14 January 2017 at 9:09pm |
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Based on my HP 5335A Frequency Counter, the frequency is 10,062 kHz from my BK Precision 3017A Function Generator.
 This is at 1.006 kHz  Anything above 1 kHz offers the same curvature as the first photo. Both photos were measured 47.1 volts at the output under an 8 ohm dummy load. This amplifier is roughly 40 years of age. I was going to use it to drive some tweeters but, now I may just scrounge up another amplifier. Best Regards, Edited by Elliot Thompson - 14 January 2017 at 9:29pm |
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Elliot Thompson
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madboffin
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Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1538 |
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Posted: 14 January 2017 at 9:26pm |
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Yeah... classic slew rate limiting
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odc04r
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Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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Posted: 15 January 2017 at 10:05am |
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I'm afraid it is exactly as others have said, bad slew rate. If you measure the transfer function of the unit it will likely have a poor bandwidth.
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Elliot Thompson
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Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Posted: 15 January 2017 at 3:40pm |
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Thanks everyone. I benched a replacement amplifier which offered excellent results. The replacement amplifier produced -0.96 dB from 10,000 kHz - 100,000 kHz before clip, under an 8-ohm load. Best Regards, Edited by Elliot Thompson - 15 January 2017 at 3:41pm |
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Elliot Thompson
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