Using an operational amplifier, this circuit from a 90s Popular Electronics, is characterized by its high sensitivity. R5 can be added to control the gain.
Found in a 1960s Philips documentation, this circuit accepts inputs from 16 to 20 V. The...
The input of this regulator can be between 7 and 12 V and the output is 5 V. The circuit is from...
The circuit shown in the figure makes use of an LM3909, a low consumption and low voltage IC. The...