This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
We found this preamplifier for recording heads in a 1980s documentation. The circuit can be used...
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....
The frequency of this oscillator depends on the amount of light incident on the LDR. The circuit,...