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Audio Phase-Shift Oscillator with Amplitude Stabilization- Here is a phase-shift audio oscillator with excellent distortion characteristics thanks to "softened" diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion. __ Contact: Charles Wenzel of Wenzel Associates, Inc. Digital Potentiometer Controls Phase Shift- 02/15/96 EDN Design Ideas: You can use dual, quad, or hex potentiometers to put all phase-shift sections under control of a microprocessor, as in Figure 2. The DS1806 hex digital . Design by Rick Downs, Dallas Semiconductor Dallas, TX |
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Extend DDS Phase Shift Resolution- 08/05/99 EDN Design Ideas: Direct-digital-synthesis (DDS) devices find wide use in instrumentation and communications applications. Rather than using a baseband converter to modulate data in a communications system, you can use a DDS device. Such a device has onboard phase registers that accommodate phase-shift keying (PSK). In communications applications, the phase shifting is in steps of 45° (µ/4 differential-quadrature PSK) or 90° (quadrature PSK). The device has enough resolution to generate these phase shifts. In instrumentation applications, the required phase shifts vary, depending on the system under development. Design by Mary McCarthy Analog Devices Inc, Limerick, Ireland |
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Phase Shift Radio Direction Finder- Similar to the system used in modern aviation where an antenna array modulates the phase of an incoming signal. The commercial system is known as Commutated Aerial Direction Finding (CADF) where a ring of 18 identical antennas are each switched on in sequence, just like winding a rotary switch round and round so that one antenna is always connected to the receiver. __ Designed by Harry Lythall-SM0VPO
Phase Shifter Yields Slope-Polarity Detection- 03/14/96 EDN Design Ideas: The circuit in Figure 1 uses a phase shifter to provide an output signal that represents the polarity of the slope of an analog signal. You can use it for square-wave shaping of sinusoidal signals or for highpass filtering. V1839 and V1841 can range from 9 to 18V and -9 to -18V, respectively. The unity-gain isolation amplifier IC1 Design by Paul Kemp, NASA, Houston, TX
Potentiometer controls phase shift- 02/15/96 EDN Design Ideas: You can use dual, quad, or hex potentiometers to put all phase-shift sections under control of a microprocessor, as in Figure 2. The DS1806 hex digital . Design by Rick Downs, Dallas Semiconductor Dallas, TX
Scheme extends DDS phase shift resolution- 08/05/99 EDN Design Ideas: Direct-digital-synthesis (DDS) devices find wide use in instrumentation and communications applications. Rather than using a baseband converter to modulate data in a communications system, you can use a DDS device. Such a device has onboard phase registers that accommodate phase-shift keying (PSK). In communications applications, the phase shifting is in steps of 45° (µ/4 differential-quadrature PSK) or 90° (quadrature PSK). The device has enough resolution to generate these phase shifts. In instrumentation applications, the required phase shifts vary, depending on the system under development. Design by Mary McCarthy Analog Devices Inc, Limerick, Ireland
Two Transistor Wein Bridge Oscillator- Scroll Down to find this circuit. Here is a two-transistor Wien bridge oscillator using an ordinary night-light bulb for stabilization. The output is about 6 volts p-p and can drive fixed loads as low as 2 or 3 thousand ohms without additional buffering. A 10 k amplitude potentiometer. __ Contact: Charles Wenzel of Wenzel Associates, Inc. |
