Found in an old Popular Electronics this circuit can also be adapted to be used as a shield. In this version the control can trigger loads from the light that falls on an LDR.
This circuit tests rectifier diodes with currents from 200 mA to 450 mA, thus serving to test...
This circuit generates a 1296 MHz signal from 100 or 1,000 kHz crystals. We found it in an...
This preamplifier with RIAA equalization was obtained in a documentation from the 1980s. The...