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  • Circuit Ideas: Setting Up a Low-Power Transceiver
    , and 915 MHz but can be programmed in steps of 250 Hz for operation at other frequencies in the UHF range. The chip operates as a conventional heterodyne receiver. The RF input is converted to an intermediate frequency, then gets filtered and fed to a frequency shift-key demodulator. Demodulated data
  • Adapting Qi-compliant wireless-power solutions to low-power wearable products
    components-specifically, matching the smaller-size receiver coils to correspondingly smaller transmitter coils to maintain the best coupling factor. Also important is implementation of appropriate external circuit modifications with the transmitter and low-power receiver to minimize system power losses.
  • Condet Proximity Switches
    The new technology varies considerably from that used previously. It permits innovative proximity switches that have previously been inconceivable. The devices of the previous generation contain a front-mounted coil, which forms part of the oscillator circuit of a high-frequency oscillator
  • Frequency Modulation (FM) Tutorial
    Edwin H. Armstrong, known as one of the founding fathers of radio technology, invented the superheterodyne radio receiver in 1918 and frequency modulation (FM) in 1933 [1]. These two concepts, along with his regenerative circuit technique developed in 1912, formed the basis of radio frequency
  • EETimes.com | Electronics Industry News for EEs & Engineering Managers
    Sampling shift spurs digital receiver gains A new sampling technique may lead to simpler single-chip radio receivers that can be produced without special filters. The circuit technique, described at the International Conference of Signal Processing Applications and Technology here, allows sampling
  • Switch Tips: Electro-Optic Level Switches
    Electro-optic level switches are used to signal the presence or absence of a liquid. They contain an infrared light-emitting diode (LED) and a light receiver. Light from the LED reflects from a prism forming the tip of the device back into the light detector. With no liquid present, most LED light
  • Engineer's Assistant Using a PIC16F84A
    This compact instrument is intended to be a digital laboratory tool for hardware and, in some cases, software debugging. It contains four instruments in one unit: logic probe, single channel logic state analyzer, frequency counter and serial code receiver. The only chip used is a PIC16F84A running
  • Direct Battery Connection Benefits Portable Designs
    In any in-circuit rechargeable battery application, such as a mobile phone, Bluetooth headset or GPS receiver, power-management circuit designers have two options. They can either isolate the battery from the load while charging the battery, powering the load directly from the adapter

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