At this circuit the SSM2044 IC is used, a 4 pole voltage controlled filter designed for electronic music applications. On-chip voltage control of resonance allows direct and easy interfacing with programmers and controllers. The IC features extended control range, low noise, and high control rejection. The filter can also be used as a low distortion [...]
One of the troubleshooting tests required for telephone/data twisted-pair copper lines is the determination of the attenuation factor. The test uses frequencies of 300 to 4000 Hz to plot the attenuation performance. Because many central-distribution lines are in locations where power lines are unavailable, a battery-powered generator is desirable for the testing. The circuit in [...]
Digital potentiometers are versatile devices; you can use them in many filtering and waveform-generation applications. This Design Idea describes an oscillator in which setting the resistance of two digital potentiometers independently programs the oscillation amplitude and frequency. Figure 1 shows a typical diode-stabilized Wien-bridge oscillator that generates accurate sine waves from 10 to 200 kHz.
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