The circuit shown is from the National Semiconductor Linear Applications Handbook of 1994. using ADC0808. The circuit can handle data from up to 4 transducers with an 8-bit output.
The operational amplifier for this circuit found in a 1979 documentation may be the 741. We can...
The UM3562 integrated circuit (not very easy to find) synthesizes three types of sound that...
This stethoscope or amplifier for hearing aid using a crystal headset and microphone was found in a...