minimum load impedance for DIY opamp

F1 FAN · 15th September 2009, 01:12 AM

I'm curious as to what the minimum loading requirements might be for the 2SK389 diff stage/ 3310 follower circuit depicted in fig 16 of Nelson's DIY opamp article? http://www.passdiy.com/pdf/diyopamp.pdf

Thanks

Nelson Pass · 15th September 2009, 01:34 AM

It will be limited by R3 in terms of voltage swing. As
a concept it will drive any impedance, with output level
limitations.

F1 FAN · 15th September 2009, 02:21 AM

Thanks Nelson.I'm using a pair for preamp duties and I think they sound very good but wanted to be sure they were OK with <10k loads should I encounter such an amp in the future.

15th September 2009, 01:12 AM	#1
F1 FAN diyAudio Member Join Date: Jun 2006	minimum load impedance for DIY opamp I'm curious as to what the minimum loading requirements might be for the 2SK389 diff stage/ 3310 follower circuit depicted in fig 16 of Nelson's DIY opamp article? http://www.passdiy.com/pdf/diyopamp.pdf Thanks

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15th September 2009, 01:34 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	It will be limited by R3 in terms of voltage swing. As a concept it will drive any impedance, with output level limitations.

15th September 2009, 02:21 AM	#3
F1 FAN diyAudio Member Join Date: Jun 2006	Thanks Nelson.I'm using a pair for preamp duties and I think they sound very good but wanted to be sure they were OK with <10k loads should I encounter such an amp in the future.