Circuits & Schematics

Search results: 2,810 Output: 1-10
  1. This Idea for Design provides a visual indication of an input voltage’s relationship to upper and lower threshold values and can be used as a quick pass/marginal/fail tester. It uses a modified Wien-Bridge oscillator structure to create an ...
    26-01-2022
  2. You can improve a current sink's accuracy by at least two orders of magnitude by adding two standard 1%-tolerance resistors. As a bonus, you also compensate for errors that a low-current-gain pass transistor's base current introduces. To do ...
    25-01-2022
  3. Resistance-based transducers, such as strain gauges and piezoresistive devices, find common use in the measurement of several physical parameters. For applications in which digital processors or microcontrollers serve for data acquisition and ...
    24-01-2022
  4. Many people consider white LEDs to be the future of lighting. Strung together, several LEDs can replace an incandescent lamp or a compact fluorescent lamp. High-power white LEDs need a dc voltage of about 3.6 V at a current of about 350 mA to ...
    23-01-2022
  1. In most keypads, pressing a key closes a contact that bridges two lines in an xy matrix. If you use a microcontroller to detect a key closure, checking the states of (x+y) lines requires an equal number of I/O pins. Occupying only one free I/O pin, ...
    19-01-2022
  2. No matter what portable power source you use, the lower the starting voltage your circuitry operates at, the better. A lower startup voltage also maximizes runtime. Furthermore, to completely discharge the power source, circuitry must run on ...
    14-01-2022
  3. Fellow engineer Sanjay R. Chendvankar of Mumbai, India, recently offered a novel way of reducing current through a relay coil ( see Ref. 1 ). His idea utilized an unused normally closed pair of contacts of that relay to reduce the driving voltage ...
    12-01-2022
  4. This circuit drives a resistive heater element with a low-frequency, pulse-width-modulation (PWM) voltage source, providing heat output that’s directly and linearly proportional to the duty cycle of the drive signal. The circuit’s ...
    04-01-2022
  5. The best way to make midrange, low- to medium-accuracy temperature measurements (considering size, cost, performance, and ease of use) is to use an IC temperature sensor. But most IC temperature sensors are designed for applications where the ...
    03-01-2022
  6. Today's digital ICs typically demand complex voltage sequencing, a task that usually requires dedicated ICs or microprocessors. But what if your requirements are more modest? The sequencing scheme presented here requires only a single ...
    29-12-2021