This very low power amplifier is designed by Amperex for hearing aids. It is based on TAA370 which is not an integrated circuit that can be found today.
This circuit synthesizes a sinusoidal signal from logic pulses that can be obtained from an...
This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer...
This circuit uses a loop antenna to receive and amplify signals from the 60 kHz long wave band....