Circuits & Schematics

Search results: 2,856 Output: 1-10
  1. A few years ago, manufacturers specified their white, but dim, LEDs for a maximum forward-current rating of 20 mA. Today's white LEDs deliver more light and thus must operate at ever-higher bias currents. Maintaining control of an LED's ...
    18-05-2022
  2. You can use a microcontroller that includes an ADC to design a two-wire-plus-ground keyboard interface. For example, you can use a resistive voltage divider to identify a pressed key (Reference 1). A microcontroller's integrated ADC typically ...
    16-05-2022
  3. Most inexpensive pushbutton switches, particularly pc-board-mounting and membrane types, have momentary action. Latching types are often larger and relatively expensive, and they frequently are unavailable in the style you'd like to use. You ...
    12-05-2022
  4. When you face the task of generating a regulated voltage that's higher than the available power-supply voltage, you may consider a boost regulator. Although a boost converter can in theory generate almost any voltage that's higher than its ...
    11-05-2022
  1. The performance of the watchdog circuit in Figure 1 may not match that of a dedicated watchdog circuit, but this circuit is helpful when the only watchdog in the lab doesn’t meet your design’s temperature requirement and when you are in ...
    10-05-2022
  2. For an inverting amplifier with hysteresis, resistors R A , R B , and R F determine the crossover voltages (Figure 1). Unfortunately, using three resistors to set the upper and lower trip voltages creates a dependence between the two trip voltages: ...
    03-05-2022
  3. A number of single-chip VGAs variable-gain amplifiers are available today. Unfortunately, they all have drawbacks, such as high noise, 55 V limit, low input impedance, or nonlinear gain/frequency characteristics. The circuit in Figure 1 is a ...
    27-04-2022
  4. The low-cost, three-transistor boost switching regulator in Figure 1a is a modified astable multivibrator comprising Q 1 , Q 2 , and L 1 , which substitutes as a load for Q 2 . At the full output power of 200 mW, the oscillation frequency is ...
    26-04-2022
  5. Some amplifier applications require clamping or limiting due to large, sporadic signals appearing at the amplifier input. Clamping these errant signals protects the amplifier and other sensitive downstream circuitry. It also improves overdrive ...
    25-04-2022
  6. Some of the electrical signals we work with are said to be “floating” with respect to ground. A typical example might be a voltage drop over a shunt resistor in a power supply or a complex biomedical signal, such as an ECG. In such ...
    21-04-2022