This high input impedance circuit was found in American documentation from the 1980s. The power supply must be symmetrical. The circuit applies to modern operational.
This circuit is from a Poptronics, American magazine from August 2000. The circuit can be...
This simple circuit uses a 200 uA microammeter of the type found as VU, being able to measure...
This circuit consists of an echo or reverberation chamber for sound systems and must be...