This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
The frequency of the sound produced in the speaker depends on the light that falls on the...
Two inverters of a 4069B type CMOS integrated circuit form this oscillator which is characterized by having...
This amplifier was obtained from an Electronics Now from the 90s. The circuit has a dual 26V power...