This circuit was found in documentation from the 90s, being indicated for the deflection of cathode ray tubes. It consists of a DC voltage amplifier and operates at frequencies up to 1 kHz.
This receiver for listening to headphones and 2-battery power was found in Japanese documentation from the...
This circuit was found in a Texas Instruments optoelectronics manual and can work with any...
This circuit activates a relay when raindrops fall on the sensor. The circuit is from 1960...