This simple indicator circuit was found in a documentation from the 90s. Trimpots can have values between 2k and 10k, a series resistor is recommended to limit the current to the minimum setting.
Found in a 90s Radio Electronics this circuit requires precision resistors in the dividing...
Mouser Electronics is already providing new MOSFETs EF SIHx28N60EF of Vishay series for voltages...
The LMV321 is a low voltage operational amplifier from ON Semiconductor. The following diagram,...