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  2. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  3. Analog-to-digital converter - Wikipedia

    en.wikipedia.org/wiki/Analog-to-digital_converter

    Since a practical ADC cannot make an instantaneous conversion, the input value must necessarily be held constant during the time that the converter performs a conversion (called the conversion time). An input circuit called a sample and hold performs this task—in most cases by using a capacitor to store the analog voltage at the input, and ...

  4. Digital-to-analog converter - Wikipedia

    en.wikipedia.org/wiki/Digital-to-analog_converter

    For instance, a 1-bit DAC is designed to reproduce 2 (2 1) levels while an 8-bit DAC is designed for 256 (2 8) levels. Resolution is related to the effective number of bits which is a measurement of the actual resolution attained by the DAC. Resolution determines color depth in video applications and audio bit depth in audio applications.

  5. Push–pull converter - Wikipedia

    en.wikipedia.org/wiki/Push–pull_converter

    Push-pull converter (+12V → ±18V; 50W) as potted module. ① transformer; ② and ③ electrolytic capacitors vertical and horizontal mounted; ④ discrete circuit board in through-hole technology A push–pull converter is a type of DC-to-DC converter , a switching converter that uses a transformer to change the voltage of a DC power supply.

  6. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    In December 2020, the second edition of PDF 2.0, ISO 32000-2:2020, was published, with clarifications, corrections, and critical updates to normative references [16] (ISO 32000-2 does not include any proprietary technologies as normative references). [17] In April 2023 the PDF Association made ISO 32000-2 available for download free of charge. [15]

  7. Operational amplifier applications - Wikipedia

    en.wikipedia.org/wiki/Operational_amplifier...

    Archived from the original (PDF) on 2008-05-09. (165 KiB) Logarithmically variable gain from a linear variable component; Impedance and admittance transformations using operational amplifiers by D. H. Sheingold; High Speed Amplifier Techniques very practical and readable – with photos and real waveforms; Properly terminating an unused op-amp

  8. Compressor characteristic - Wikipedia

    en.wikipedia.org/wiki/Compressor_characteristic

    Compressor characteristic is a mathematical curve that shows the behaviour of a fluid going through a dynamic compressor. It shows changes in fluid pressure , temperature , entropy , flow rate etc.) with the compressor operating at different speeds.

  9. Refrigeration - Wikipedia

    en.wikipedia.org/wiki/Refrigeration

    For example, an individual compressor can be rated by comparing the energy needed to run the compressor versus the expected refrigeration capacity based on inlet volume flow rate. It is important to note that both CoP and PF for a refrigeration system are only defined at specific operating conditions, including temperatures and thermal loads.