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“Hippasian” nonlinear VFC stretches dynamic range

A voltage-to-frequency converter uses square roots to extend dynamic range by orders of magnitude. External Source

Free ac/dc digital-power reference design has universal input and PFC

Microchip Technology has announced an ac/dc reference design that it based on the new dsPIC33F GS series of digital-power DSCs (digital-signal controllers). External Source

CMOS-NAND gates control sump pump

A similar circuit lets you control both the sump pump and the water level. External Source

Use an LED to sense and emit light

LEDs in portable devices often show power status, battery status, or Bluetooth-connection activity. LEDs can be major factors in determining battery life because their intensity is directly proportional to power drain. External Source

Two instrumentation amps make accurate voltage-to-current source

Many designs require precise voltage-controlled current sources, especially in the presence of variable loads. Common approaches, which use a few op amps and a handful of passive components, have inherent errors due to nonideal component characteristics, ... External Source

Simple circuit indicates health of lithium-ion batteries

A simple inexpensive circuit quickly indicates a battery pack's health. External Source

Simple method uses PSpice for Thevenin-equivalent circuits

A simple method lets you obtain the Thevenin voltage and resistance and the Norton equivalence with the aid of simulation. External Source

DAC and flip-flops form constant-current source

Using two flip flops, you can program a serial-input DAC to produce a constant 4 mA. External Source

Convert negative inputs to positive outputs

Create a 3.3V source from a –5V supply. External Source

Twin-T power oscillators work as dc-biased ac sources

Using a frequency-selective twin-T network and the LT3080 linear regulator, you can achieve a low-distortion twin-T oscillator with power-driving capability. External Source

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