Circuits & Schematics: power supply - 7

61. Ultrasonic mist maker (DIY)
    T.K. Hareendran
    Circuits Analogue Design Oscillators Texas Instruments NE555P
    .. device is configured to run on a single 5-Vdc to 12-Vdc input, this transducer driver needs a 20-Vdc to 26-Vdc (V_DRIVE) power supply channel in addition to a 5-V regulated DC supply rail. So a dedicated power supply circuitry will be ...
    Dec 24, 2024

62. Expanding output range of step-up converter
    Peter Demchenko
    Circuits Supply Analog Devices ADP1611
    .. ) of EPC2051 cannot exceed +6 V, so be careful. Materials on the topic Datasheet Analog Devices ADP1611 Datasheet Efficient Power Conversion EPC2051 Datasheet Taiwan Semiconductor HER107
    Dec 17, 2024

63. Eliminate clicks when muting single-ended audio
    Peter Demchenko
    Circuits Analogue Design Audio
    .. four components: a resistor (R), a capacitor (C), a diode (D), and the switch (Sw). When the microphone circuit has power, capacitor C charges until it reaches the output bias voltage. With the switch in the “Mute” ...
    Dec 15, 2024
64. Adjust tempco in size and sign
    Michael Wyatt
    Circuits Analogue Design Tools and Technologies Analog Devices AD590KR
    .. a current proportional to the absolute temperature with a scale factor of 1 µA/Kelvin. Resistor R OS and the 15-V supply to which it’s connected sink a current equal to the room-temperature AD590 current of 298.2 µA. ...
    Dec 13, 2024
65. ∆V_BE bread dough incubator
    Stephen Woodward
    Circuits Automation Analogue Design Measurement Diodes AP4310A
    .. signal are below setpoint. This allows 120-Hz pulses coupled through C3 to reach Q3’s gate, switch it on, and apply power to the heater. When the heater warms Q1 (and presumably the dough) to the programmed temperature, then the PTAT ...
    Dec 10, 2024
66. 0 V to -10 V, 1.5 A LM337 PWM power DAC
    Stephen Woodward
    Circuits Signal Processing, Filters ON Semiconductor LM337
    .. a genre, DACs are low power devices with power and current output capabilities limited to the milliwatt and milliampere range. There is, of ...
    .. better) precision of the LM337 internal voltage reference, rather than relying on the sometimes-dodgy stability of a logic supply rail as basic PWM DACs often do. Figure 1 shows the circuit. Figure 1. LM337 joins forces with 4053 CMOS ...
    Dec 2, 2024
67. "Bolt-on" circuit, transistors create zero-drift current source
    Tim Davis
    Circuits Supply onsemi MMBT4401 MMBT4403
    .. equal in those two transistors. The design is fault-tolerant and can be reverse-biased. For industrial designs at higher supply voltages, the majority of the forward voltage drop is across the collector/base of Q1 and Q3, the top ...
    Nov 30, 2024
68. Low-power PWM circuit is simple, inexpensive
    Anthony Smith
    Circuits Oscillators Supply Texas Instruments SN74HC14
    .. prohibitively expensive in low-cost applications. Furthermore, if an application requires a high-frequency PWM signal, the power consumption may be unacceptable in power-sensitive applications, such as high-efficiency, low-power switch-mode ...
    .. operation for V CC = 5 V 5% and IC 1A and IC 1A = 74HC14, but you may need to recalculate the values if you use a different supply voltage or a different inverter. Two possible devices to use for IC 1A are the 74HC14 and the 4093. The ...
    Nov 29, 2024
69. Earplugs ready? Let's make some noise!
    Nick Cornford
    Circuits Oscillators Measurement Microchip PIC12F1501 MCP6002 MCP6004 MCP6022
    .. package with 8 pins or even fewer will suffice? The schematic for that is too boring to show imagine a rectangle fed with power (decoupled with a single cap) and having a GPIO pin delivering the PRBS but here is the MPASM assembly-language ...
    .. the rail voltage may be, and the signal levels of 10 dBu avert clipping even for low rail voltages. With a guaranteed 5 V supply, A2c could have about 7 dBs of extra gain before clipping starts. The output crest factor the peak-to-RMS ...
    Nov 28, 2024
70. Pocket-size white noise generator for quickly testing circuit signal response. Part 2 - Technical implementation
    Aaron Schultz Peter Haak
    Circuits Oscillators Measurement Linear Technology LTC2063
    .. a spectrum analyzer. If excess noise is visible on the signal, additional EMI shielding might be needed. When an external power supply is used instead of batteries, common-mode current can easily add to the signal. It is recommended to ...
    .. peaking, use a smaller C X . For a more damped response, use a larger C X . Critical IC parameters are related to op amp supply current and parts with low supply current may require a somewhat larger C X , while parts with high supply ...
    Nov 24, 2024

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