This circuit was taken from Maxim documentation from the 1990s. It can be implemented on the basis of modern operational amplifiers. Power supply doesn't have to be symmetrical.
We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power...
This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current...
This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The...