Electronics > Projects, Designs, and Technical Stuff
Interest in an arbitrary load
sahko123:
I want to gauge the interest in designing an arbitrary load generator which can take an input from a waveform generator and turn it into a load at say 100mV per amp or 1v per amp of input. I'm also wondering olif anything like that alreasy exists and at what expense and maybe if there's enough interest it might be a fun thing to design. I know there are alot of active loads on rge forum but I've not yet seen one with a waveform input just dc loads.
magic:
Many of the existing ones could be made programmable by replacing a single potentiometer with a BNC jack, as they are basically opamp+transistor voltage followers which try to "mirror" the setpoint voltage on the shunt resistor. Maybe you would want some input protection, either to save the load from bad generator or to save the generator from catastrophic failure of the load. And there is the question of bandwidth...
sahko123:
Yeah mostly i think it would be for testing how power supplies would respond to ripple current so the higher the bandwidth the better.
MarkF:
You mean something like the eLoad I built?
A 0-5V external signal provides a 0-2.5A load current.
I forget now, but I believe the eLoad has a response up to 5KHz.
sahko123:
I guess so but 5khz isn't even halfway up the audio range
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