Circuits & Schematics: power supply - 6

51. How to collect free energy from atmosphere
    Swagatam Majumdar
    Circuits Bad Prescriptions Supply
    .. free energy collector circuit helps to convert surrounding radio frequency waves to electric power and can provide 40 watts to 10 watts indefinitely. The circuit concept An option to increase the output power ...
    Jan 15, 2025

52. PWM power DAC incorporates an LM317
    Stephen Woodward
    Circuits Supply Fairchild LM317
    .. approach of backing up a DAC with an amplifier to boost output, this design idea charts a less traveled by path to power. It integrates an LM317 positive regulator with a simple 8-bit PWM DAC topology to obtain a robust 11-V, 1.5-A ...
    .. 2% precision of the LM317 internal voltage reference, making it securely independent of vagaries of both the 5-V logic supply rail and incoming raw DC supply. Figure 1 diagrams how it works. Figure 1. LM317 regulator melds with HC4053 ...
    Jan 14, 2025

53. Capture 16-bit readings of 8 thermistors in less than 1 second for $2
    Stephen Woodward
    Circuits Measurement Signal Processing, Filters Texas Instruments CD74HC4051 CD74HC4053
    .. voltage inverter. Shortly thereafter the idea morphed into an uncomplicated, inexpensive, and fairly fast (1 MHz), low power voltage to frequency converter (VFC) “Voltage inverter design idea transmogrifies into a 1 MHz VFC” ...
    Jan 14, 2025
54. High-side current amplifier forms 28 V circuit breaker
    Circuits Supply Maxim MAX4374
    .. application for that device (see Figure 2 of its data sheet). The data-sheet circuit, however, is suitable only for supply voltages in the range +2.7 V to +5.5 V. You can extend that range to 28 V by adding a general-purpose NPN ...
    Jan 13, 2025
55. An ultra low distortion oscillator with THD below -140 dB
    Vojtech Janásek
    Circuits Oscillators Measurement National Semiconductor LME49710
    .. If the lowest possible noise is important, you can use lower resistor values, but that’s at the expense of higher power consumption and increased distortion. The LM49710 distortion performance is specified with minimum load ...
    Jan 10, 2025
56. 2 GHz active probe. Part 2
    James Wilson
    Circuits Measurement Texas Instruments BUF802 OPA140 TPS7A39
    .. a flat, wideband response, and an output matching network including the transmission line to the output connector. The power supply block uses a charge pump and dual low-dropout (LDO) voltage regulator to supply positive and negative DC ...
    Jan 9, 2025
57. A two transistor sine wave oscillator
    Cor van Rij
    Circuits Oscillators
    .. around ~1% distortion (Figure 3). Figure 3. The scope image shows the oscillator output at circa 1 kHz. A variation in the supply voltage from 9 V to 12 V causes a frequency variation of only 2 Hz and a variation of output amplitude from ...
    Jan 6, 2025
58. Current mirror drives multiple LEDs from a low supply voltage
    Rex Niven
    Circuits Supply Light Nexperia BC817
    .. LEDs at a regulated current from low supply voltages can be difficult because minimal overhead voltage is available for control circuits. A ...
    Jan 6, 2025
59. Resistive dummy load draws constant current from 1.2 to 50 V
    John Guy
    Circuits Measurement Supply Analog Devices MAX480 MAX6006A
    .. dummy-load circuit has been in use at Maxim for more than 10 years (see the Figure 1). It's useful for testing power supplies and power amplifiers as well as drivers for LEDs, relays, and solenoids. Plus, it overcomes the ...
    .. load resistors R A , R B , and R C yield four ranges of output-current capability. To set the range for a power-supply load, connect the positive lead of the supply to the + input of the load circuit and the negative load to one ...
    Dec 26, 2024
60. Symmetrical 10 V, 1.5 A PWM-programmed power supply
    Stephen Woodward
    Circuits Supply Texas Instruments CD4053B
    .. regulated power supplies are handy tools found on well-equipped electronics lab benches. The symmetrical varieties that produce ...
    .. voltage outputs of opposite polarity, are even more so. Figure 1’s version of a symmetrical 0 V to 10 V, 1.5 A lab supply implements an extra handy trick: computer programming via a single PWM output. Figure 1. LM337 , LM317 , and ...
    Dec 26, 2024

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