Circuits & Schematics: power supply - 3

21. Current converter performs purely on paltry phantom power
    Stephen Woodward
    Circuits Measurement Supply Texas Instruments OPA2244
    .. a 4-20 mA signal to 0-20 mA and deliver it to a grounded load with no additional power supply needed. Recently, EDN kindly published a design of mine for a micropower 4-20 to 0-20 mA current loop ...
    Jul 23, 2026

22. Solid state airflow sensor with linear 4-20mA output
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments LM7905 TLV2197
    .. a self-heated transistor in a TO-92 package and force it to hold a constant temperature differential above ambient, the power input required to keep it stuck to setpoint will be determined by its thermal impedance Z T relative to the ...
    Jul 14, 2026
23. Position sensor gets linear 4 to 20mA current source output
    Stephen Woodward
    Circuits Measurement Texas Instruments SN74HC4066 TLV197-Q1 TLV9051
    .. tolerant, linear 4 to 20 mA, current mode output. Figure 3. Dangling the TLV431 shunt voltage reference Z1 from the 15 volt supply is a shortcut toward implementing a noise- and cable length- tolerant current mode output. Here’s how ...
    Jul 8, 2026
24. Hi-end microphone preamplifier with variable compression, noise gating and adjustable gain
    Mike (mixos)
    Circuits Analogue Design Audio Analog Devices SSM2166
    .. Header connector for microphone Header connector for output Header connector for supply input Low noise and distortion Power-down feature 20 kHz bandwidth (61 dB) Power LED D1 PCB dimensions 36.99 × 26.51 mm Compression ratio (can ...
    .. can be set anywhere from 0 dB to 20 dB, for a total signal path gain of up to 80 dB. The project operates on a single +5 V supply, accepts input signals up to 1 V RMS, and produces output signal levels 1 VRMS (3 VP-P) into loads 5 kΩ. The ...
    Jun 25, 2026
25. 4-20mA to 0-20mA converter sips mere microamps
    Stephen Woodward
    Circuits Analogue Design Interfaces Diodes AP4310A
    .. half a Watt. Some cook even hotter than that! This results in some very un-green complications like TO220 packaged power pass transistors sporting substantial heatsinks. Would Greta T. approve? I think not!7 The design in Figure 1 ...
    .. of the 4 to 20 mA input current to generate the 0 to 20 mA output while needing only microamps from its own local power supply. It consumes merely 250 µA × 24 V = 6 mW (typical) and dumps only similar single-digit milliwatts ...
    Jun 23, 2026
26. Charge pump efficiently divides supply voltage
    David A. Johnson
    Circuits Beginners Fairchild MM74C14
    This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. Materials on the topic Datasheet Fairchild MM74C14 Datasheet Diodes ZVN2106A Datasheet Diodes ZVP2106A discovercircuits.com
    Jun 17, 2026
27. Dual-fan PWM cooling circuit with a 6W isolated flyback power supply
    Hesam Moshiri
    Circuits Supply Microcontrollers Usage Atmel ATtiny13
    .. project presents the design and implementation of a dual-fan PWM cooling circuit, integrating a compact and efficient power supply with intelligent fan speed regulation. The circuit consists of two main parts: a 6 W isolated flyback ...
    Jun 15, 2026
28. Zener test circuit serves as DC source
    John Jardine
    Circuits Measurement Supply Texas Instruments SN74HC132
    .. infiltrated the ranks of 1N4148 diodes assembled on a pc board. As a bonus, the circuit can serve as a moderate-voltage, power-limited adjustable dc source. Although conventional multimeters' resistance ranges typically apply enough ...
    .. depends on the device under test’s breakdown voltage (a). To use the circuit as a variable medium-voltage power supply, replace the device under test with a network (b). Upon power application, Pin 3 of IC 1 (one section of a ...
    Jun 8, 2026
29. Triply simply sequence supply voltages
    Stephen Woodward
    Circuits Supply Texas Instruments CD40106B
    .. circuit design for power supply on/off sequencing uses Schmidt triggers for triple-positive-rail timing purposes. Recent design ideas ...
    Jun 4, 2026
30. Low power oscillators
    David A. Johnson
    Circuits Oscillators Fairchild 2N3904 2N3906
    This page has two unusual two-transistor oscillators. I set the component values for a low frequency application. Both circuits draw only about 1 microamp of current. Materials on the topic Datasheet Fairchild 2N3904 Datasheet Fairchild 2N3906 ...
    May 27, 2026

Sort by: relevance / date