Circuits & Schematics

Search results: 2,122 Output: 1-10
  1. Mark Shill
    When probing digital logic levels on a circuit board, locating the indicator of the logic level near the probe tip is convenient, so that you can keep both the indicator and probe tip constantly in sight. When using a handheld DVM or oscilloscope ...
    Apr 23, 2025
  2. John Betten
    Switching power supplies can be notorious noise generators. You should prevent this noise, which is conducted, radiated, or both, from returning to the input source, where it can potentially wreak havoc on other devices operating from the same ...
    Apr 22, 2025
  1. Stephen Woodward
    Tachometry, the measurement of the speed of spin of rotating objects, is a common application. Some of those objects, however, have quirky aspects that make them extra interesting, even scary. One such category includes outdoor noncontact sensing ...
    Apr 18, 2025
  2. Yongping Xia
    A previously published Design Idea describes a practical gadget that has the potential to save a lot with little investment ( Reference 1 ). However, the circuit uses 120 V line voltage and, as such, it is not that convenient for many applications. ...
    Apr 18, 2025
  3. Stephen Woodward
    LM317 fans will recognize Figure 1 as the traditional LM317 constant current source topology. It closely regulates I OUT = V ADJ /R S by forcing the OUTPUT pin to be V ADJ = 1.25 V positive relative to the ADJ pin. Thus, I OUT = V ADJ /R S to a ...
    Apr 16, 2025
  4. David Lees Donald Schelle
    Circuits Microcontrollers Usage Fairchild FDN359AN FDS6679 QSE113
    Receiving infrared (IR) signals while conserving system power is difficult, and typically requires the inclusion of complex power-management routines in the firmware. You can avoid that problem by disconnecting power to the microcontroller when IR ...
    Apr 15, 2025
  5. Will Hadden
    The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3 V source and adjusts the total LED current from 1 to ...
    Apr 14, 2025
  6. Damian Bonicatto Phoenix Bonicatto
    When designing devices with microcontrollers (MCU), I like to use some of the analog-to-digital converter (ADC) inputs to measure onboard voltages along with all the required sensors inputs. This means I often run out of ADC inputs. So presented ...
    Apr 11, 2025
  7. Tim Davis
    Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
    A colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC ( Ref. 1 ). He wanted to know how the jitter performance of the discrete comparator compared to an IC comparator, which was used with an ...
    Apr 9, 2025
  8. Stephen Woodward
    There’s been a lot of interesting conversation and DI teamwork lately devising circuits for ON/OFF power control using inexpensive momentary-contact switches (See Ref. 1 Ref. 4 ). Most of these designs have incorporated edge triggered ...
    Apr 7, 2025