Circuits & Schematics: power supply - 7

61. On/off latch circuit
    David A. Johnson
    Circuits Supply Digital Nexperia 74HC14D
    .. you want to turn on and off power to a device with a single pushbutton switch. The circuit below performs this logic function with just a few ...
    Oct 14, 2025

62. Circuit forms ideal diode function
    David A. Johnson
    Circuits Bad Prescriptions Supply Texas Instruments TLV2401
    .. circuit uses a low power op Amp and a p-channel FET to form a diode function with a very low 0.05 volt voltage drop. With the selected ...
    Oct 14, 2025
63. Buck regulator and two inductors make dual-polarity converter
    Keith Szolusha
    Circuits Supply Analog Devices LT1956
    .. common problem for power-supply designers is to create a compact, dual-polarity step-down converter. If space and cost are not concerns, ...
    Oct 8, 2025
64. Improve PWM controller-induced ripple in voltage regulators
    Christopher Paul
    Circuits Supply Toshiba CUS10S30
    .. logic inverter. Although this can result in excellent ripple suppression, it has a disadvantage the need for an inverter power supply, which does not degrade the accuracy of the regulator’s 1% or better reference voltage. Stephen ...
    Oct 6, 2025
65. Circuit controls ratiometric or simultaneous power-up of multiple rails
    Dirk Gehrke
    Circuits Supply Texas Instruments TPS54310 TPS54610
    .. core voltage and the I/O voltage. The core voltage is usually lower than the I/O voltage. Guidelines for determining how to power up two or more voltage rails depend on the part and the manufacturer you use. The first implementation in ...
    .. you use. The first implementation in Figure 1 shows how to realize ratiometric sequencing, which means that both power-supply output rails simultaneously start and simultaneously reach their final regulated output voltage. This ...
    Oct 6, 2025
66. Power bank "Keep-alive"
    Tirdad Sadri Nejad
    Circuits Beginners Supply Diodes NE555
    .. simple module to keep power banks from turning off, when your DIY circuit draws low currents. A simple power bank keep alive module. As the ...
    .. is good for usual purposes, or DIY circuits which draw a current above 100 milliamps; but not for tiny circuits with a supply current lower than 100 mA. This simple 555 based circuit, is an astable multivibrator with a period of ~5 ...
    Oct 1, 2025
67. PWM buck regulator interface generalized design equations
    Stephen Woodward
    Circuits Supply XLSemi XL4016
    .. 2. General design-accommodating parameters listed above. Note that U1-specific parts (e.g., inductor, capacitors, and power diode) are not shown. Note that if the microamps and millivolts of residual zero offset that persist on the ...
    .. power diode) are not shown. Note that if the microamps and millivolts of residual zero offset that persist on the unloaded supply output at PWM = zero duty factor aren’t objectionable, then the Q2 R5 current sink is irrelevant and ...
    Sep 24, 2025
68. Fake contacts, bounced to order
    Nick Cornford
    Circuits Measurement Microcontrollers Usage Texas Instruments CD74HC132 CD74HC4520
    .. recent Design Ideas ( Ref, 1 ) have involved button-pushing to control power. Some may have been more resistant to contact-bounce than others but how can we really check that? This DI ...
    Sep 22, 2025
69. LED driver combines high speed, precision
    Richard Cappels
    Circuits Supply Light Texas Instruments LM324 LM7805
    .. the base of Q 3 becomes several hundred millivolts more positive than the base of Q 4 , current from Q 2 shunts to the 5 V power supply. No current flows through, so the LED is off. When the base of Q 3 is less positive than that of Q 4 , ...
    Sep 17, 2025
70. Build automatic transfer switch (ATS) with simple analog electronics
    T.K. Hareendran
    Circuits Supply Texas Instruments NE555P
    .. today’s world, both households and industrial facilities are exploring ways to improve power reliability by harnessing multiple energy sources, not just the electricity from the grid. One clever solution: ...
    .. switch (ATS). An ATS is a clever piece of hardware that automatically shifts the electrical load from your primary power supply to a backup or standby source like a generator when it detects an outage. The result? A stable, uninterrupted ...
    Sep 8, 2025

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