This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time. The power is from a battery, the consumption of 1.65 mA and the power of about to 1 mW.
This circuit with junction field effect transistors was found in documentation from the 1980s. The...
This ultra-low noise circuit was found in the May 1990 issue of Radio Electronics magazine. The...
The configuration shown is from the 1994 Linear Applications Handbook, published by National...