This circuit was found in a Dutch documentation from 1970. The circuit makes use of semiconductors that have current equivalents and is indicated by a 0-5 mA milliammeter.
We find this circuit in a 2005 Linear Technology manual. The circuit applies to small DC motors...
This circuit is from 80s documentation, using still common CMOS components. The display is 7...
This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The...