Skip navigation
1 2 Previous

Project14

16 Posts authored by: Hesam.M
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 introduced a complete H-Bridge DC motor driver using four IR3205 power MOSFETs and two IR2104 MOSFET drivers. Theoretically, the above-mentioned MOSFET can handle currents up to 80A, however, in practice we ca ...
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) Single and cheap ATTiny13 microcontroller Low standby current consumption   As we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, alcohol and hand sanitizers are vital, ex ...
  This project is only free for personal and non-commercial use   AC loads live with us! Because they are everywhere around us and at least home appliances are supplied with the mains power. Many types of industrial equipment are also powered with the single-phase 220V-AC. Therefore, we frequently face situations that we need to have full control (dimming) over an AC load, such as a lamp, an AC motor, a vacuum cleaner, a drill, … etc. We should know that controlling an AC loa ...
  Inrush current/Switch-ON surge is the maximal instantaneous input current drawn by an electrical device when first turned on. Inrush current is much higher than the load’s steady-state current and that’s the source of many problems such as fuse blowing up, load failure, load’s lifetime reduction, sparks at the switch contacts … etc. The figure below shows the inrush current phenomenon captured on the Siglent SDS1104X-E oscilloscope. The long spike is clear. In th ...
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 article, we will build an automatic hand sanitizer dispenser that uses IR sensors to detect the presence of a hand and activates a pump to pour the liquid on the hand. The intention was to find the cheap ...
  Features: AC – DC Conversion Double output voltages (Positive – Ground – Negative) Adjustable positive and negative rails Just a Single-Output AC transformer Output noise (20MHz-BWL, no load): Around 1.12mVpp Low noise and stable outputs (ideal to power Opamps) Output Voltage: +/-1.25V to +/-25V Maximum output current: 300mA to 500mA Cheap and easy to solder (all component packages are DIP)   A double output low noise power supply is an essential tool for ...
  References Source: https://www.pcbway.com/blog/technology/Programmable_Police_LED_Flasher_Using_an_STM8.html [1]: https://www.st.com/resource/en/datasheet/l78m.pdf [2]: http://www.ti.com/lit/ds/symlink/lm1117.pdf [3]: https://www.st.com/resource/en/datasheet/stm8s001j3.pdf [4]: http://www.vishay.com/docs/91192/sihfl110.pdf [5]: https://componentsearchengine.com/part.php?partID=1049204 [6]: https://componentsearchengine.com/part.php?partID=4735 [7]: https://componentsearchengine.c ...
A tiny DC to DC buck converter board is useful for many applications, especially if it could deliver currents up to 3A (2A continuously without heatsink). In this article, we will learn to build a small, efficient, and cheap buck converter circuit.     References Full Article: https://www.pcbway.com/blog/technology/DC_to_DC_Buck_Converter_Adjustable__97__Efficient__3A.html MP2315 Library: https://componentsearchengine.com/part.php?partID=930350 Altium Plugin: https://www ...
      Features: Identify a fake Lithium-Ion/Lithium-Polymer/NiCd/NiMH battery Adjustable constant current load (can also be modified by the user) Capable of measuring the capacity of almost any kind of battery (below 5V) Easy to solder, build, and use, even for beginners (all components are Dip) An LCD user interface   Specifications: Board Supply: 7V to 9V(Max) Battery Input: 0-5V(max) – no reverse polarity Constant Current Load: 37mA to 540mA(max) – 16 Ste ...
  Single-Ended Transmission Single-ended signaling is a simple and common way of transmitting electrical signals from a sender to a receiver. The signal is ground referenced (0 Volt) and one conductor (wire) carries the signal and one conductor carries the common reference potential. The current associated with the signal travels from sender to receiver and returns to the power supply through the shared ground connection. If multiple signals are transmitted, the carrier requires one wire ...
Switching power supplies are known for high efficiency. An adjustable voltage/current supply is an interesting tool, which can be used in many applications such as a Lithium-ion/Lead-acid/NiCD-NiMH battery charger or a standalone power supply. In this article, we will learn to build a variable step-down buck converter using the popular LM2576-Adj chip.                           & ...
Disclaimer: This circuit is connected directly to the mains voltage. You must care about all safety precautions before using the device. AC loads are everywhere around us because at least home appliances are supplied with the mains power. Therefore, we always face the situations that we want to have full control (dimming) over an AC load such as a lamp, a motor, vacuum cleaner … etc. We should know that controlling an AC load is not identical with a DC load. So we should use different el ...
An FM transmitter is one of the most popular devices between electronic hobbyist, professionals and even non-technical people. In this article, we gonna learn to how to build an easy, stable and digitally controllable FM transmitter.   For this design, I have selected the VMR6512 module which truly is like a full RF block on a chip!. It eliminates all essential circuitry for a basic FM transmitter such as inductors and trimmers. According to the VMR6512 datasheet: “VMR6512 is a highly ...
Motor driver circuits are one of the most useful designs for industrial, automotive and robotic applications. Full control over a DC motor is an essential function for a variety of applications. For many low power applications, 1A to 1.5A RMS current consumption limit/per motor is enough, therefore I selected a useful chip that can operate with just a few external components.   The DRV8833 chip is a dual H-bridge motor driver. According to the datasheet: “The DRV8833C device is an int ...
A typical HD4470 character LCD comes with 16 pins. If we ignore the backlight and the power pins, the 8 data and 3 control pins remain. We can address the LCD in the 8 bits or 4 bits mode. Therefore we have to consider at least 11 I/Os (8 bits) or 7 I/Os (4 bits).   The circuit design could be more complicated when we realize most of these LCDs just operate with a 5V supply and typically they are not compatible with 3.3V MCUs. Many modern MCUs offer 5V tolerant pins but naturally in a limit ...