The current mirror is usually used in input stages of Operationsverstaerkern in some high-quality Verstaerkerkonzepten find him up discreetly, usually with matched transistors in a housing to minimize the temperature.
Here links to current mirror schematics
Here you will find Schematic Circuit Diagram for DIY and further information on Current mirror Current Mirror
|Basic circuit of the current mirror||www-ebs.e-technik.uni-ulm.de/Tutorium/Grundschaltungen/g007/|
|Experiments with the current mirror||www.allaboutcircuits.com/vol_6/chpt_5/14.html|