TRANSFORMERLESS_TONE_ANNUNCIATOR

Published:2009/7/5 21:21:00 Author:May | From:SeekIC

This circuit does not require an output transformer or an output coupling capacitor;the annunciator can easily be turned on or off by a control input voltage driving a 10-MΩ input resistor, R3. For a smaller acoustic output, replace output transistor, Q1, with a 100-Ω resistor, while also raising the voice coil impedance to 100Ω, to prevent loading of the IC.



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