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  1. sam.moshiri

    LNK304 Transformerless Power Supply

    Whenever you hear the transformerless supply term, you initially imagine the capacitor-based solution, which means a high voltage capacitor in series with the mains line, then a bridge rectifier, a Zener diode, a filtering capacitor, and so on. Such a circuit is not just able to deliver...
  2. sam.moshiri

    Ultrasonic Distance Measurement Using Arduino

    An ultrasonic range finder is a useful tool in a variety of real-life and robotic applications, such as in obstacle avoidance and distance measurement systems. The ultrasonic range finder measures the distance by emitting a 40KHz pulse of ultrasonic sound that travels through the air until it...
  3. sam.moshiri

    Double Lithium-Ion/Lithium-Polymer USB Type-C Charger

    Nowadays, Lithium batteries are used extensively in portable devices, such as cellphones, laptop computers, electronic gadgets, … etc. There is a standard industry-defined procedure (cycle) for charging the lithium-ion/lithium-polymer batteries, otherwise, the lifetime of the batteries is...
  4. sam.moshiri

    A Portable White Noise Generator Circuit

    The white noise generator circuit is a handy tool that can be used to examine the circuit or a communication line under some random noises to make sure about the stability of the device in real and harsh environments. The current consumption of the device is low, so you can power the circuit...
  5. sam.moshiri

    Cooling FAN Controller Using an LM35 (No MCU)

    The high temperature of the power components is a known phenomenon in electronics. To overcome this challenge, the designers mount heatsinks on the components to dissipate the heat, however, in many commercial and home appliance devices, the embedded heatsink is not adequate and the air must be...
  6. sam.moshiri

    0-30V, 0-7A Adjustable Switching Power Supply [CC-CV, with LED]

    DC to DC buck converters is a famous topology in the electronic and a widely used circuit in electronic devices. A buck converter steps down the input voltage while it increases the output current. In this article/video, I have discussed a DC to DC buck converter that can be used effectively as...
  7. sam.moshiri

    Easy and Compact 555 Dual LED Flasher [Altium Schematic + PCB]

    Many electronic beginners are afraid of designing SMD boards and just stick to through-hole and dip components. The reason for this could be using the wrong electronic designing CAD software. This video intends to handle you a complete, although a simple example of a project using both SMD and...
  8. sam.moshiri

    DC to DC Boost Converter using UC3843

    DC to DC converters are quite popular among electronic enthusiasts and are widely used within the industry. There are three major types of non-isolated DC to DC converters: buck, boost, and buck-boost. In this article/video, I used there major components such as the famous UC3843 chip, a power...
  9. sam.moshiri

    Infrared Remote Control Decoder & Switcher Project

    Infrared remote controllers are everywhere around us. The majority of home appliances are controlled using infrared remote controls. In this article/video, we learn to build a device that can decode (almost) any IR remote control and use the instructions to switch the relays (loads). So we can...
  10. sam.moshiri

    A Strange Problem with Xiaomi Redmi (MI) AirDots Bluetooth Earphones!

    Does anybody know what's the problem with this earphone? so weird!
  11. sam.moshiri

    Active Low Pass Filter Circuit Analysis using Siglent SDS2102X Plus Oscilloscope [Part-1]

    In this video, I explain some theories behind a low pass active filter circuit, then I built a simple active low pass filter using the LM358 opamp. I tested the filter's behavior using the Siglent SDG1025 waveform generator and the Siglent SDS2102X Plus oscilloscope.
  12. sam.moshiri

    USB to UART Converter using Microchip MCP2200

    Nowadays USB port is used widely for data transactions between electronic devices and computers. In many scenarios, there is no need to communicate with the USB port directly, therefore electronic designers use USB to UART (RS232-Serial) converter chips, so the USB port is converted to a virtual...
  13. sam.moshiri

    DSN-VC288 Voltmeter-Ammeter Review Using The Siglent SDM3045X Multimeter

    In this video, I have reviewed the DS-VC288 panel mount voltmeter/Ammeter using the Siglent SDM3045X benchtop multimeter. The VC288 meter did not present acceptable readings, especially in the current measurement. It uses an LM358 Opamp which is not suitable for this purpose and it does not show...
  14. sam.moshiri

    Low Noise Adjustable Power Supply (30V-4A, CC-CV)

    Power supplies are one of the most popular topics in electronics. There are two major types of regulated power supply: linear and switching. Both power supply types introduce some advantages and disadvantages, however, a linear power supply offers better line and load regulation figures and it...
  15. sam.moshiri

    A Full Digital FM receiver with Arduino and TEA5767 Module

    FM transmitters/receivers are among the top favorite circuits of any electronic enthusiast. In this article/video, I have introduced a complete digital FM receiver design that has equipped with an LCD screen and three push-buttons. It can search for the FM signals from 76MHz to 108MHz manually...
  16. sam.moshiri

    Component Tester (V-I Curve Tracer) Using The Oscilloscope XY Mode

    In this video, I've talked about the XY mode/feature of a Siglent SDS1104X-E oscilloscope and used it in a combination with a Siglent SDG1025 waveform generator to show how you can build an interesting component tester (V-I curve tracer) to test silicone diodes, Zener Diodes, Schottky diodes...
  17. sam.moshiri

    H Bridge PWM DC Motor Driver + PCB

    An H-Bridge (Full-Bridge) driver is quite popular in driving loads such as brushed DC motors and it is widely used in robotics and industry. The main advantages of using an H-Bridge driver are: high efficiency, rotation direction change, and braking the motor. In this article/video, I have...
  18. sam.moshiri

    A Free and Open-Source Hand Sanitizer Dispenser

    Features   High stability and no sensitivity to the ambient light Laser-cut acrylic (plexiglass) enclosure Cost-effective Flow control capability of the hand-sanitizer/alcohol (efficiency) Through-hole components (easy to solder) Single-layer PCB board (easy to fabricate)...
  19. sam.moshiri

    Powerful Digital AC Dimmer Using STM32

    References Article: https://www.pcbway.com/blog/technology/4000W_Standalone_Digital_AC_Dimmer_Using_STM32.html [1]: TLP521 Datasheet: https://www.futurlec.com/Datasheet/LED/TLP521.pdf [2]: BTA26 Datasheet: https://www.mouser.com/datasheet/2/389/cd00002264-1795706.pdf [3]: AN437, ST...
  20. sam.moshiri

    Non Contact Hand Sanitizer Dispenser, Easy, Cheap, No Arduino!

    As we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, Alcohol and hand sanitizers are vital fluids, however, they must be used properly. Touching alcohol containers or hand sanitizers with infected hands can spread the virus to the next person. In this...
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