This circuit uses a 555 (according to the diagram) to generate 50 ms tone bursts at a frequency of 1.5 kHz. The circuit is from an 80's Electronic Design.
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...