Circuits & Schematics: power supply - 2

11. 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

12. 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
13. 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
14. 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
15. 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
16. 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
17. 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
18. 30A AC soft starter (inrush current limiter)
    Hesam Moshiri
    Circuits Arduino Supply Microcontrollers Usage Atmel ATtiny13
    .. this AC soft starter that is equipped with a fail-safe mechanism. During start-up, the inrush current passes through a power resistor, and after a delay (adjustable between 1 ms to 1 s), a 30 A power Relay shorts the resistor and ...
    .. the logic circuit activates the fail-safe Relay that turns OFF the load to prevent any damage. 3 LEDs indicate the Supply, Normal, and Fault conditions. I selected the cheap ATtiny13 MCU as a controller. To design the schematic and ...
    May 20, 2026
19. Over-temperature micro-power alarm
    David A. Johnson
    Circuits Measurement Digital Texas Instruments CD4013B
    The circuit is powered for years by a single 3 volt lithium battery. It sounds an alarm when the temperature exceeds a certain point. With some minor changes the circuit could also be configured for an under temperature (freeze) alarm. The circuit ...
    May 14, 2026
20. Single switch controls sequential operation of multiple power supplies
    Jayapal Ramalingam
    Circuits Supply Texas Instruments LM393
    .. circuits manage multi-PSU powerup and shutdown sequences In projects containing digital and/or analog circuits, multiple power supplies are used, generally 5 V DC for digital circuits and 15 V DC for analog circuits. Some projects also ...
    .. 5 V DC for digital circuits and 15 V DC for analog circuits. Some projects also use 24 V or 48 V DC as the third power supply. In many cases, these power supplies need to be switched on in sequence, commonly 5 V DC first and 15 V DC ...
    May 12, 2026

Sort by: relevance / date