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Short-wave scanner converter

    
Example: Infrared control system
Electronic circuits archive 


Short-wave scanner converter



Source: CircuitoZ




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TWIN-T AUDIO SINE WAVE OSCILLATOR. This circuit produces a clean sine wave signal ideal for audio testing, or wherever a good-quality sine voltage source is required. It uses only one integrated circuit which is a common dual operational amplifier, the Texas Instruments TL072CP. The values shown provide an output frequency of about 1000 Hertz. This frequency may be varied over a wide range, using the formula shown in the schematic.

AUDIO SWEEP OSCILATOR. This circuit was designed for a sound effect, but may serve other useful purposes when a basic, swept-frequency audio source is required. It produces both square and triangular wave outputs that ascend from about 80 to 730 Hertz in a repeating cycle of about 12 seconds. Appropriate component-value substitutions will yield variations in these parameters.



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