# Is there a standard component that can “save” a certain current or voltage and what is it's name?

What I am thinking about is something like this analog equivalent of a flipflop:

        ____________
1 °-----|---| A |---|-----° 2
3 °-----|----||-----|-----° 4
5 °-----|           |
_____________
|
___
-

| A |: ampere meter
||: power source


The behaviour I'm looking for is that when a certain voltage is applied to pin 5 the current is measured between 1 and 2. This current should then be induced between 3 and 4.

Is it possible to do this in a purely non-digital manner?

• You mean like a current mirror circuit? en.wikipedia.org/wiki/Current_mirror – JIm Dearden Aug 24 '17 at 9:34
• Saving and copying aren't the same thing. – Finbarr Aug 24 '17 at 9:34
• The current between 3 and 4 should not depend on the current between 1 and 2 if 5 is not high. – Richard Aug 24 '17 at 9:36
• Hmm, I would not call that a flip-flop. A flip-flop has two output states. Yours has many possible output states, that immediately does not make it a flip-flop anymore. You will have to 1) provide more context how this is going to be used 2) provide more detailed electrical specifications. 3) coming up with a solution makes it a design job and that's not what we're here for. Some of us can be hired for hard cash though. – Bimpelrekkie Aug 24 '17 at 9:37
• Sounds like a sample and hold amplifier - analog.com/en/products/amplifiers/specialty-amplifiers/… – HandyHowie Aug 24 '17 at 9:49