A spectrally pure sine wave oscillator is required for data converter; filter and audio testing. Figure provides a stable frequency output with extremely low distortion. This quartz stabilized 4 kHz oscillator has less than 9 ppm...
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9 ppm distortion, quartz stabilized oscillator
Photosensing with ambient background
Trying to shield ambient light from your photo circuit is not a trivial task. You would think that you could just cover your circuit with your hands, but that is not a solution: Pulse oximeters depend on the translucency of flesh...
A single cell laser diode driver using the LT1110
Recently available visible lasers can be operated from 1.5 V supplies, given appropriate drive circuits. Because these lasers are exceptionally sensitive to overdrive, power to the laser must be carefully controlled lest it be damaged...
Method sets voltage in multiple-output converters
When you design a transformer for any power converter, you face several compromises. You must trade off core size against the number of primary turns and flux density...
Low-power, super-regenerative receiver targets 433-MHz ISM band
Designers often choose a super-regenerative receiver – despite its frequency instability and poor selectivity – for battery-powered, short-range, wireless applications in which power consumption is a major issue...
Adjustable 0 V to 5 V power supply
Linear regulator ICs are commonly used in variable power supplies. Common types such as the 317 can be adjusted as low as 1.25 V in single-supply applications. At low output voltages power losses in these regulators can be a problem...
90 µA Precision Voltage-to-Frequency Converter
Figure 1 is a micropower voltage-to-frequency converter. A 0 V to 5 V input produces a 0 kHz to 10 kHz output with a linearity of 0.05%. Gain drift is 80 ppm/°C. Maximum current consumption is only 90 µA...
Inverted regulator increases choice and reduces complexity
Most circuits are referenced to ground, where relatively low-voltage components can monitor and control the low side of a load but not the high side. For example, nearly any low-voltage rail-to-rail-input op amp can detect a voltage increase indicating overcurrent through a resistor that connects between the load and ground...
Electronically generate rotating magnetic fields
Many applications, such as medical therapies, magnetic stirrers, and induction heating, call for a rotating magnetic field, which you can generate by attaching multiple permanent magnets to a dc motor...
Device transmits radio waves with almost no power
Engineers at the University of Washington and Stanford University say they have developed a new ultra-low-power method of communication that can wirelessly transmit information simply by opening and closing a switch that connects a resistor to an antenna...