This sensitive 5-band circuit was found in a September 1995 issue of Electronics Now magazine. The headphones, for greater sensitivity, should be high impedance.
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
Found in the 2005 Linear Technology Application Manual, this circuit controls the torque of a...
This circuit was found in the Italian magazine Radio Elettronica from September 1977. It consists of a...