Circuits & Schematics: Design - 5

41. Exclusively select 1 of N relays
    Circuits Supply ECE EDR2
    .. you may need a group of switches where, if any switch is activated, it deactivates the previously active switch. This Design Idea implements such a function with relays. This “one and only one” function is often ...
    24-11-2023

42. Simultaneously control gain on two independent channels with a single element pot
    Circuits Analogue Design Audio
    .. two Howland current pumps, a differential amplifier, and a boatload of precision resistors; it is also DC coupled. This design idea offers an alternative. It avoids the liabilities of dual element ganged pots by controlling the gain of ...
    23-11-2023

43. Status indicator flags five discharge states
    Circuits Measurement Supply STMicroelectronics LM358
    .. just one leftover op amp or comparator, you can add a battery-condition indicator to your portable circuit design. To indicate the life in an aging battery visually, the circuit in Figure 1 varies the duty cycle and flash ...
    20-11-2023
44. Circuit lets you isolate and measure current
    Circuits Measurement STMicroelectronics L272 LM358
    .. often need to measure current during circuit design and debugging. You can perform that task by breaking a path, inserting a shunt resistor, measuring its ...
    19-11-2023
45. DIY solar tracker system
    Circuits Automation Solar
    .. generates information for the motor that rotates the panels for tracking the sun. DIY sun tracking sensor The sensor design is shown in Figure 2. P1 and P2 are adjusted in such way that the motor stands still when the LDRs get the ...
    14-11-2023
46. The DAC buddy
    Circuits Measurement Signal Processing, Filters Texas Instruments TLV2371-Q1
    .. design idea contributor, Peter Demchenko, recently published “Extending the resolution of a peripheral ...
    09-11-2023
47. DIY LED display provides extra functions and PWM
    Circuits Microcontrollers Usage Digital Texas Instruments CD74HC14 CD74HC132 CD74HC137 CD74HC259
    .. design idea (Figure 1) shows how easily “new flesh can be added to the old bones” and how some new ...
    06-11-2023
48. 3-leg regulator in shunt mode makes variable power supply symmetrical
    Circuits Supply Fairchild LM317
    .. if allowed to persist, but U1 subtracts a matching 2.5 V and thereby fixes it. If you’re considering using this design, please be aware it assumes that current drawn from the positive output will be always at least as great as ...
    30-10-2023
49. Low-cost digital DAC provides digital three-phase-waveform synthesis
    Circuits Oscillators NXP UDA1330ATS
    .. sampling frequencies of 8 to 55 kHz. These features make the DACs attractive for three-phase DDS with few components. This Design Idea implements DDS techniques using an ARM microcontroller, IC 1 ; one stereo-DAC, IC 2 ; and one op amp, IC ...
    27-10-2023
50. Temperature controller has "take-back-half" convergence algorithm
    Circuits Automation Analogue Design Texas Instruments CD4053B LMC6484
    .. the problem by adopting a better estimate of H whenever the system's temperature crosses the setpoint, T = T S ). This Design Idea outlines a TBH (take-back-half) method that takes deliberate advantage of the approximate equality of ...
    26-10-2023

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