Circuits & Schematics: power supply - 5

41. Gold-plated PWM-control of linear and switching regulators
    Christopher Paul
    Circuits Supply Microcontrollers Usage Texas Instruments OPA2376 SN74AC04
    .. are blameless. To determine U 1 ’s output resistance, its spec shows that its minimum logic high voltage for a 3-V supply is 2.46 V under a 12-mA load. This means that the maximum for each inverter is 45 Ω, which gives us 9 Ω for ...
    Dec 4, 2025

42. Circuit improves on bias for GaAs FETs
    Tom Roberts
    Circuits Supply Amplifiers Analog Devices LT1085
    .. has 0 V on the gate and 1.25 on the drain can result in damage to the device. For example, M/A-Com's MAAM26100-PI MMIC power amplifier requires 8 V for V DD and 5 V for V GG . With 1.25 V on V DD and 0 V on V GG , the MMIC draws ...
    .. as well as to the order in which these biases turn on and off. A GaAs-FET amplifier that uses two bias voltages a negative supply, V GG , on its gate and a positive supply, V DD , on its drain requires that V GG be present before the ...
    Dec 3, 2025
43. Circuit offers series protection against power-line transients
    Alfredo Saab
    Circuits Supply Analog Devices MAX1614
    .. transients on low-voltage power lines can sometimes attain amplitudes many times the nominal voltage level. That behavior often calls for ...
    .. This circuit protects a load, connected to the right pair of terminals, from undervoltage and highvoltage transients in the supply voltage, connected to the left pair of terminals. In the circuit, which powers loads as heavy as 1 A from a ...
    Dec 1, 2025
44. A simpler circuit for characterizing JFETs
    John L. Waugaman
    Circuits Measurement ON Semiconductor MPF102 MPF4392
    .. R1, R3, R5, D2, and TEST pushbutton S3 comprise the simple current limit circuit (R4 is a parasitic Q-killer). S3 supplies power to S1, the polarity reversal switch, and S2 selects the measurement. J1 and J2 are banana jacks for the DMM set ...
    .. Use components on hand as much as possible. Accommodate both N- and P-channel devices while using a single voltage supply. Use a wide range of supply voltages. Incorporate a current limit with LED indication when the limit is ...
    Nov 26, 2025
45. A precision, voltage-compliant current source
    Christopher Paul
    Circuits Supply Texas Instruments TLA431 TLVH431B
    .. U 1 strives to establish a constant voltage at V S regardless of the DC and AC voltage variations of the unregulated supply V 1 . Working against it in descending order of impact are the magnitude of the conductance of the R 3 + R 4 ...
    Nov 25, 2025
46. Circuit makes square deal
    Stephen Woodward
    Circuits Analogue Design Texas Instruments OPA2228 OPA4228
    .. classic nonlinear analog function is the squaring circuit. It’s useful in power sensing, frequency multiplication, RMS computation, and many other odd jobs around the lab bench. Figure 1. The ...
    Nov 25, 2025
47. CMOS Schmitt trigger IC makes VCO
    David A. Johnson
    Circuits Oscillators Beginners Lingxing Microelectronics CD4584
    .. changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a ...
    Nov 24, 2025
48. Protecting your prototype with automotive overvoltage protection
    Simon Bramble
    Circuits Supply Analog Devices MAX16126
    .. prototyping. This simple circuit can prevent hours of rework caused by momentary lapses of concentration when an incorrect power supply is applied to a circuit. Introduction The good thing about being a field applications engineer is that ...
    Nov 21, 2025
49. 85VAC-260VAC to 12V-0.5A AC-to-DC flyback converter using an RM6 ferrite core
    Hesam Moshiri
    Circuits Supply Dongke Semiconductor DK106
    .. isolated AC-to-DC flyback converter is the most commonly used power supply type for home and industrial devices. Fear of the main voltage and complexity of calculations cause ...
    Nov 17, 2025
50. My 100-MHz VFC - the hardware version
    Jim McLucas
    Circuits Measurement Texas Instruments CD74HC14 SN74LVC1G14 74LVC1G74 TLA431 TLV9162
    .. the PCB, and then tested the design. Figure 1. VFC design that operates from 100 kHz to beyond 100 MHz with a single 5-V supply, providing square wave outputs at ½ and ¼ the main oscillator frequency. The hardware ...
    Nov 14, 2025

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