Circuits & Schematics: Design - 6

51. How to make a noise-free infrared obstacle detection module
    Hesam Moshiri
    Circuits Measurement Robots Vishay TSOP1738KA1
    .. PCB board mostly designed by SMD components which only take a small 3.2 cm × 1.8 cm board size. Figure 2. PCB board design of the IR obstacle detection circuit. As you can see on the PCB silkscreen, you must install an isolation ...
    Apr 17, 2024

52. Single phase mains cycle skipping controller sans harmonics
    Jayapal Ramalingam
    Circuits Supply Diodes NE555
    .. this controller skips a certain number of power cycles in between, to vary power to the heaters. In this typical design, 10 full cycles are taken as base. Timer U3 (555) through R2, R4, and C1 decides this by giving output pulses ...
    Apr 15, 2024

53. 15-bit voltage-to-time ADC for "Proper Function" anemometer linearization
    Stephen Woodward
    Circuits Measurement Signal Processing, Filters Texas Instruments LMC555
    .. back I published a simple design idea for a thermal airspeed sensor based on a self-heated Darlington transistor pair (Ref, 1). The resulting ...
    Apr 4, 2024
54. Virtual-zener circuit simplifies high-voltage interface
    Philip Lane
    Circuits High Voltage Signal Processing, Filters Analog Devices LT1021
    .. design for a photonic switch needs more than approximately 70 V at the cathode of a duo-lateral optical ...
    Apr 1, 2024
55. A new and improved latching power switch. Part 1
    Anthony Smith
    Circuits Supply Texas Instruments LM393 TLC393
    .. previous Design Idea [ 1 ] outlined a relatively simple circuit in which a momentary pushbutton could be made to function ...
    Mar 28, 2024
56. Supersized log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL084 LM385
    .. D3/R4 bootstrapping R3 to give a linear fall in voltage equivalent to 20 dB in 1.7 s, which, more by happy accident than by design, is exactly what we want. Now we pass the signal through D4, whose tempco of about 2 mV/ C compensates for ...
    Mar 21, 2024
57. High-power LED drivers require no external switches
    Alfredo Saab Steve Logan
    Circuits Supply Light Maxim MAX1685 MAX4162 MAX5035
    .. source. For LEDs with currents greater than 0.35 A, an inductive switching regulator is usually the best choice. This Design Idea presents a series of circuits based on single-power-IC switching regulators, with efficiency and ...
    Mar 20, 2024
58. Efficient voltage doubler is made from generic CMOS inverters
    Stephen Woodward
    Circuits Supply Texas Instruments SN74AC14
    .. a design needs auxiliary voltage rails and the associated current loads are modest, capacitor pump voltage multipliers ...
    Mar 14, 2024
59. ∆Vbe differential thermometer needs no calibration
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments CD4053B TLV2374
    .. heatsinks, thermoelectric coolers (TECs), and thermal control in electronic assemblies. Figure 1 illustrates an inexpensive design for a high-resolution differential thermometer utilizing the ∆V BE effect to make accurate measurements with ...
    Mar 6, 2024
60. Hotwire thermostat: Using fine copper wire as integrated sensor and heater for temperature control
    Stephen Woodward
    Circuits Automation Analogue Design Measurement STMicroelectronics TSB712
    .. are based on separate temperature sensor and heater devices with means for feedback between them. But in some recent EDN design ideas (DIs) we’ve seen thermostat designs that meld the functions of sensor and heater into a single ...
    Mar 4, 2024

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