Circuits & Schematics: Design

1. 85V-260VAC to 5VDC-2.5A flyback switching power supply
   Circuits Supply Dongke Semiconductor DK1203
   .. to perform all tests. I am confident that building this circuit enhances your knowledge regarding switching power supply design, except for using it for real applications. Specifications Input voltage: 85-265 VAC Output voltage: 5 VDC ...
   07-05-2024

2. Cooling FAN controller using an LM35 (No MCU)
   Circuits Beginners STMicroelectronics LM358
   .. noises. C1 and C2 are bypass capacitors and are used to reduce noises. PCB layout Figure 2 shows the PCB layout of the design. It is a two layers PCB board and except for the connectors, all components are SMD. The board size is 3.8 cm ...
   06-05-2024

3. Drive a blue LED from a 3V battery
   Circuits Supply Light ON Semiconductor NCP1729
   .. pose problems when available power-supply voltages don't meet or exceed the LED's 3 V forward-voltage drop. This Design Idea shows how to drive a blue LED from a 3 V battery or another power supply. The circuit in Figure 1 uses ...
   03-05-2024
4. A groovy apparatus for calibrating miniature high sensitivity anemometers
   Circuits Measurement
   .. are an important category of environmental sensor. Articles about their design, data capture, and linearization have comprised topics featured in EDN Design Ideas, several quite recently. ...
   01-05-2024
5. How to build an isolated digital AC dimmer using Arduino
   Circuits Arduino Supply NXP BT138-800
   .. and your specific needs. Figure 7. The output waveform in 50% of the power (dim = 5000). References RC snubber circuit design for TRIACs Downloads Gerber files Materials on the topic Datasheet NXP BT138-800 Datasheet ON Semiconductor ...
   26-04-2024
6. Efficient digitally regulated bipolar voltage rail booster
   Circuits Analogue Design Supply onsemi MC74AC132
   .. amplifier saturation in systems supplied with only a single logic-level power rail has been receiving a lot of activity and design creativity recently. Voltage inverters generating negative rails for keeping RRIO amplifier output circuitry ...
   26-04-2024
7. How to make a noise-free infrared obstacle detection module
   Circuits Measurement Robots Vishay TSOP1738KA1
   .. PCB board mostly designed by SMD components which only take a small 3.2 cm × 1.8 cm board size. Figure 2. PCB board design of the IR obstacle detection circuit. As you can see on the PCB silkscreen, you must install an isolation ...
   17-04-2024
8. Single phase mains cycle skipping controller sans harmonics
   Circuits Supply Diodes NE555
   .. this controller skips a certain number of power cycles in between, to vary power to the heaters. In this typical design, 10 full cycles are taken as base. Timer U3 (555) through R2, R4, and C1 decides this by giving output pulses ...
   15-04-2024
9. 15-bit voltage-to-time ADC for "Proper Function" anemometer linearization
   Circuits Measurement Signal Processing, Filters Texas Instruments LMC555
   .. back I published a simple design idea for a thermal airspeed sensor based on a self-heated Darlington transistor pair (Ref, 1). The resulting ...
   04-04-2024
10. Virtual-zener circuit simplifies high-voltage interface
    Circuits High Voltage Signal Processing, Filters Analog Devices LT1021
    .. design for a photonic switch needs more than approximately 70 V at the cathode of a duo-lateral optical ...
    01-04-2024

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