For a project I am working on I need to take a DC voltage source, around 12V, with at least 1A of current, and I need to add it to a generated DC pulse train which will be from -4 to 4V and will be very low current, say less than 20 mA. So I need the output to be from 8V to 16V DC pulse and I need the current to be from 0.98 to 1.02A.
Someone told me about a summer, but you can imagine googling "summer" does not bring up much that is not related to the season of summer. Googling voltage summer tends to bring up summing amplifiers using op-amps which only handle very small current. And remember I do not want any current or voltage gain. I have my two inputs and I want to simply sum their voltage and currents together.
Does anyone have any ideas for how to accomplish this? Any help would really be appreciated.
In case you are wondering, my 12V, 1A voltage source will be a switching converter from mains supply (110V, 60Hz to 12V DC)
My -4V to 4V pulse train will be from an op amp output setup as a comparator.
Thank you for any help you can give.