This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
This circuit was found in a 1978 publication. Equivalent operational amplifiers can be used. The...
This instrumentation circuit was obtained in the National Semiconductor's Linear Applications...
This circuit produces a sinusoidal signal whose frequency can be calculated using the formula in...