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sam.moshiri

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  1. Does anybody know what's the problem with this earphone? so weird!
  2. 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.
  3. 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 COM port on the computer. The initial thought of many designers is to use FTDI chips to do the USB to UART conversion. There is nothing wrong with FTDI chips, however, they are expensive. In this article/video, I introduced a cheap USB to UART converter module that uses the MCP2200 chip from Microchip.
  4. 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 a linear behavior. The SDM3045X multimeter was used as a reference. I have tested the voltage and current readings separately.
  5. A tip: As I mentioned in the video, in the last revision of the PCB board (which is available for you), the distance between electrolytic capacitors and the power resistors has been increased, however, if you still have concerns about this, you can use 470uF-50V capacitors instead of 1000uf-50V capacitors which are smaller in diameter.
  6. 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 handles lower noise at the output, specifically when the power supply is adjustable and the output is under load; although its efficiency is lower than a switching power supply. In this article/video, I introduced an adjustable 30V-4A linear power supply that provides constant voltage and constant curren
  7. 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 and automatically (Scan mode). The signal strength is also displayed as a bar graph on the LCD screen. The output sound is amplified by a 3W+3W Class-D stereo amplifier that handles high-quality and strong enough audio power. As a controller, I have used the cheap and popular Arduino-Nano board. So let’s
  8. 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, LEDs, Resistors, transistors, capacitors .. etc. Also, you can use it to learn about the behavior of the components and semiconductors. You only need to follow a very simple circuit (schematic) and hock the probes to the correct circuit points. In the video, I have tested these components: 330-ohm r
  9. 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 can expect to get currents up to 40A if the MOSFET temperature is kept as low as possible, using a big
  10. 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, expensive, and in some areas hard to find fluids, so, they
  11. 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 Application Note: https://www.st.com/resource/en/application_note/cd00004096-rc-snubber-circuit-design-for-triacs-stmicroelectronics.pdf [4]: MOC3021 Datasheet: http://www.farnell.com/datasheets/97984.pdf [5]: AMS1117-3.3 Datasheet: http://www.advanced-monolithic.com/pdf/ds1117.pdf
  12. You're welcome. it doesn't have a controller. the intention was to find the easiest and cheapest solution. Please follow the video and provided resources.
  13. 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 cheapest and easiest solution and design a circuit. Therefore no Microcontroller or Arduino has been used
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