Circuits & Schematics: power supply - 10

91. Micropower CMOS oscillator, draws only 0.5 µA
    David A. Johnson
    Circuits Oscillators Beginners Texas Instruments CD4007UB
    .. necessary. The circuit shown generates a low frequency square wave signal while drawing only 0.5 microamps from a 6 volt supply. The circuit uses a number of N and P channel MOSFETs, contained within an inexpensive CD4007UB IC. The ...
    Aug 31, 2025

92. A different twist to the power pushbutton problem: A kilowatt AC DAC
    Stephen Woodward
    Circuits Supply Power Texas Instruments CD4060B
    .. Idea (DI) contributors have recently explored various possibilities for ON/OFF power control using just a momentary contact “shiny modern push-button,” many of which build off of Nick ...
    .. stolen from Q3’s phase control signal. This (as you probably noticed), nicely avoids the need for a separate power supply, but it provides only microamps of current for U1 and friends. So, a power-thrifty topology was definitely ...
    Aug 26, 2025
93. High-isolation converters use off-the-shelf magnetics
    Mitchell Lee
    Circuits Supply Linear Technology LT1172
    .. SEPIC (single-ended primary-inductance-converter) topology, the converter operates from a 12 V battery-backed input supply and outputs 24 V at 200 mA. The key feature is the second “coil,” which is not a coil but rather ...
    Aug 26, 2025
94. 25-kV generator tests insulation
    Lukasz Sliwczynski Przemyslaw Krehlik
    Circuits High Voltage Measurement Texas Instruments LM555
    .. producing excessively high voltages. Q 3 , Q 4 , Q 5 , and associated circuitry allow for blocking the converter when the power supply to the circuit is too low. A too-low power-supply level may lead to an output-pulse amplitude from IC 2 ...
    Aug 26, 2025
95. Ultra-low-noise phantom microphone supply uses tiny DC-DC converter plus capacitor "trick"
    Christopher Jarboe Thomas Mosteller
    Circuits Audio Supply Analog Devices LT8362
    .. condenser microphones require a 48-V supply to charge the internal capacitive transducer and power the internal buffer for the high-impedance transducer output. You can use a simple boost converter, a filter ...
    Aug 25, 2025
96. Why modulate a power amplifier? - and how to do it
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM13700
    .. recently saw how certain audio power amplifiers can be used as oscillators ( Ref. 1 ). This Design Idea shows how those same parts can be used for ...
    .. sooner. If R2, R3, and R4 are all equal, the maximum unclipped voltage swing across R4 is just less than a quarter of the supply rail voltage. Increasing R1 and making R4 much greater than R2 or R3 allows a greater swing for those ...
    Aug 20, 2025
97. Light an LED without wasting energy
    Raju Baddi
    Circuits Supply Light Texas Instruments CD4011B
    .. need current to illuminate, and current usually flows through a power supply to an LED. A typical LED-driver circuit uses a transistor to provide current and a series resistor to ...
    Aug 20, 2025
98. A simulated 100-MHz VFC
    Jim McLucas
    Circuits Measurement Texas Instruments TLA431 SN74LVC1G14
    .. 1) has a high impedance input stage, it can operate reliably beyond 100 MHz, it can be operated with a single 5.25-V supply (or a single 5-V supply with a few added components), and it has been successfully simulated. Also, ...
    Aug 19, 2025
99. Flip ON Flop OFF: high(ish) voltages from the positive supply rail
    Stephen Woodward
    Circuits Supply Texas Instruments CD4069UB
    .. seen lots of interesting conversations and Design Idea (DI) collaboration devising circuits for power switching using inexpensive (and cute!) momentary-contact SPST pushbuttons. A recent and interesting extension ...
    .. high voltage feature, Jayapal’s design switches the negative (V SS a.k.a. “ground”) rail of the incoming supply instead of the (more conventional) positive (V DD ) rail. Of course, there’s absolutely nothing ...
    Aug 11, 2025
100. Independent control of thyristor half-wave firing angles via PWM
     Stephen Woodward
     Circuits Supply Microcontrollers Usage onsemi H11D1M
     .. a whole” is a very old and often true maxim. For example, it’s almost always true when said about AC phase angle power control. You rarely want significant alternating half-cycle asymmetry due to the (usually undesirable) DC load ...
     Aug 4, 2025

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