This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit current equivalents. The input voltage is 30 mV for total deflection. The band pass is 800 kHz.
Suggested by General Electric this circuit has 3 control positions for one load. The diode is...
This circuit was found in a 90's Electronic Design. It takes advantage of the nonlinearity...
With this circuit from Popular Electronics it is possible to determine the characteristics of a microammeter...