The National Semiconductor operational amplifier, now owned by the Texas Instruments group, is no longer easy to obtain. In the factory documentation we find this oscillator whose components can be approximated to current commercial values. The frequency can be changed by changing the value of capacitors C1, C2 and C3. The circuit must be powered by a source between 15 and 22 V with a current of at least 500 mA. The circuit is indicated for telegraphy practice.
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