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 integrated circuit is recommended as a standard amplifier in sound equipment, TV sets,...
This circuit is from a 1975 Miniwatts magazine, therefore using Philips components from that time,...
We found this circuit in a 1995 publication. It makes use of infrared LEDs of the type existing at...