This detector with ultra-low deviation was found in an American documentation from the 90s. Operational amplifiers are from that time. The power supply must be symmetrical.
This circuit activates a relay when the conducting bars (probes) are held by a person. The circuit is...
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...
This wireless intercom has a range of about 300 meters using an integrated circuit that is not...