Hi,
If you want a electronic load that has a good ac respons, look @ my schamatic on this dutch forum.
Please use google translate, and read howe to wire is, this is of great importance.
There are 2 types of electronic load's, one is the "stupid" type, only DC, and my schematic is a controled AC type.
But, the wiring must be done neatly, NO SPAGHETTI.
Read the hole Article, there is a lot of useful info in there.
Can you use different MOSFET's NO!
Can i use more MOSFET's, not in this schematic, the NE5534 cant drive more than 2.
Can i switch the BD139-16 for a 2n3904, NO!
Can i use a LM324 as a opamp NO,NO,NO
If you build it, folowing my derections, its better than Agilent enz.
why would you want to modulate the dummy load, only then watchin you scope you can see the real impedance of youre power supply.
And there are other neat tricks to do with a modulated Current Souce :-) (Class A Audio Amp)
The schematic,
Test setup on a PC heatpipe cooler
Article link
http://www.circuitsonline.net/forum/view/121338/1Kind regarts,
Blackdog