- Signal Generator -

The LM348

The LM348 chip is the basis for a signal genrator which will create three different wave forms, a (pseudo) sine wave, a square wave, and a triangle wave. It can be made to produce a wide range of frequencies. The frequency it generates is inversely proportional to resistance placed in the circuit.

Figure C7
Signal generator circuit

A circuit diagram for the signal generator is shown above. Construct your signal generator on a breadboard. If you need more detail, you can look at a breadboard diagram or photograph. Attach a headphone jack where speaker leads are indicated, so you can listen to the tone which this circuit produces.

The Parts

The heart of the signal generator is an integrated circuit chip LM348-D. Other resistors and capacitors are need to produce the wave forms. The list of parts contains mostly resistors.

Test your Signal Generator by attaching earphones to hear the tone it produces. Now measure its frequency with an oscilloscope

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