Articles - 5

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  1. It’s been nearly six years since we unleashed the $5 Raspberry Pi Zero on an unsuspecting world. Of all the products we’ve launched, Zero is still the one I’m proudest of: it most perfectly embodies our mission to give people ...
    15-12-2021
  2. Using a PN-junction diode for temperature measurement usually depends on its 2 mV/K temperature coefficient. Conventionally, you must amplify and digitize this voltage with an ADC before you can use the value in a microcontroller. Less well-known ...
    15-12-2021
China PCB Prototype and Fabrication Manufacturer
  1. Solar-photovoltaic arrays seem to get cheaper and more efficient every day, making them increasingly practical in renewable and/or remote power supply applications. Still, the voltage generated by any given array varies significantly with loading, ...
    14-12-2021
  2. Origin Wireless takes a unique approach to home security. Instead of using cameras or motion sensors, the company employs Wi-Fi in its Home Security System (Fig. 1). The control device uses Wi-Fi to communicate with your network, but it also uses ...
    09-12-2021
  1. One of our products uses a standard 1/10-W surface-mount resistor with a high-side current monitor to detect small load changes at the product’s output. Since this circuit is part of the device’s output, it’s vulnerable to field ...
    29-11-2021
  2. Oscillators Texas Instruments CD74HC02 CD74HC30 CD74HC390
    This project originated from the need to produce a linear crystal-controlled ramp signal for an HP 8620C RF sweep oscillator. It is inspired by a previously published ramp generator design [ 1 ]. That design though suffered from two issues: it used ...
    22-11-2021
  3. In multiple-output power supplies in which a single supply powers circuitry of vastly different current draws, two perplexing steps are sensing the current that each output draws and deactivating the power supply in the event of an overload on that ...
    22-11-2021
  4. The circuit in Figure 1 shows a familiar technique for converting a low-level analog signal to digital form. Resistors R 1 and R 2 set the quiescent dc level at the Schmitt inverter's input to a value roughly equal to the midpoint of the ...
    29-10-2021
  5. By using JFETs in unusual configurations, you can design simple, high-frequency LC oscillators with few passive components. The structure for implementing the amplifier stage comprises a JFET transistor that you configure as a common drain (Figure ...
    21-10-2021
  6. Security Camcorders Dahua DH-IPC-HDW4421E
    In this article, I want to talk about the method of software repair or firmware recovery of the Dahua DH-IPC-HDW4421E IP-camera (Figure 1). In general, this instruction is suitable for all Dahua IP-cameras IPC-HX4X2X series and is used if the ...
    18-10-2021