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.
It can be obtained from Mouser Electronics the new MAX14871 Maxim consisting of a full-wave...
This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio...
The integrated circuit used in this detector is uncommon today. We found it in a documentation from the...