Circuits & Schematics ON Semiconductor - 5

41. DPP Adds Versatility to VFC
    Chuck Wojslaw
    Circuits Analogue Design Measurement ON Semiconductor CAT5113
    The basic VFC (voltage-to-frequency converter) in Figure 1 comprises an integrator (IC 1 ) and a Schmitt-trigger circuit (IC 2 ). The integrator converts the dc input voltage, V IN , to a linear voltage ramp, and the Schmitt trigger sets the limits ...
    Mar 6, 2020
42. JFET Follower Amplifier Cancels Distortion
    Dimitri Danyuk
    Circuits Analogue Design ON Semiconductor BC850 BC860
    Many improvements to the follower circuit have been proposed over the years. The White cathode follower doubles the output current and makes the transfer function more linear. [ 1 ] Adding a common-base amplifying stage (current follower) ...
    Dec 24, 2019

43. HB-LED flashing beacon repurposes switching regulator
    T A Babu
    Circuits Supply Light ON Semiconductor MC34063A
    This flasher/beacon circuit can be employed as a distress signal on highways, a direction pointer for parking lots, hospitals, and hotels, etc. The circuit uses a power LED, and provides more light than a typical incandescent lamp flasher. Use of a ...
    Nov 2, 2019
44. Simple circuit controls the rate of voltage change across a capacitor or another load
    Circuits Supply ON Semiconductor MMBT2222A MMBT2907A
    Fabien Dubois EDN The circuit in this Design Idea lets you set a well-controlled voltage rate of change, often expressed as the differential dV/dt (instantaneous rate of voltage change over time in volts per second). You can vary the sensitivity ...
    Aug 29, 2019
45. A circuit to use PIC peripheral outputs simultaneously
    Circuits Interfaces Microcontrollers Usage ON Semiconductor 2N7000 BSS138
    Soumitra Bhattacharjee EDN In PIC microcontrollers, the MSSP (master synchronous serial port) module uses multiplexed pins for the I 2 C and SPI peripherals. There is typically no issue using either of the two peripherals. But what if both ...
    May 20, 2019
46. Retriggerable monostable multivibrator quickly discharges power-supply capacitor
    Jordan Dimitrov
    Circuits Supply ON Semiconductor CD4538BC
    Universal power supplies must work from mains power lines ranging from 90 to 264 V ac at 50 or 60 Hz. Directly rectifying the input voltage charges the filter capacitor to 120 to 370 V dc. Such voltages present a serious threat to personnel who are ...
    Mar 20, 2019
47. Convert Voltage to Potentiometer-Wiper Setting
    Chuck Wojslaw
    Circuits Measurement ON Semiconductor CAT5114
    The circuit in Figure 1 converts an analog input voltage, V IN , to a proportional wiper setting of a DPP (digitally programmable potentiometer). The potentiometer's wiper setting, which varies from position 0 through 31, corresponds to the ...
    Dec 13, 2018
48. LED current regulator has low dropout
    Peter Demchenko
    Circuits Analogue Design Light ON Semiconductor BC327 BC549C
    This Design Idea circuit regulates the current through one or more LEDs, making it almost independent of supply voltage. Its main advantage is a very small dropout voltage, which can be less than 100 mV. The design could find use on LED strips, ...
    Nov 20, 2018
49. Improve efficiency of low-cost switcher
    Peter Demchenko
    Circuits Supply ON Semiconductor MC34063
    Low-current switching regulator ICs often use a Darlington as the output switch. The power conversion efficiency in this case can be improved with the help of only two cheap components. To make this possible, the chip should have a separate pin for ...
    Jul 4, 2018
50. Transistors Offer Overload Delay
    Christophe Basso
    Circuits Supply ON Semiconductor NCP1200
    Although an SMPS (switch-mode power supply) can protect itself against permanent short circuits, it sometimes has problems when dealing with transient overloads. Transient overloads are not short circuits but can push the power supply above its ...
    Jun 5, 2018

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