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How can we multiply two 2-digit BCD numbers?

I am designing a PIC18F4520 microcontroller based system. By using this system I want to multiply two numbers. Each number is a 2-digit BCD number. Such as 73*27 and I want to see results as 2715 at a 4 digit seven segment display. I have a problem creating algorithms while multiplying those numbers. How can […]

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How does this BJT biased with a diode work?

I’m trying to teach myself some basic electronics and I’m stuck on understanding what’s going on with this simple NPN transistor circuit that is using a diode for bias. I’ve simulated the circuit with SPICE and I get a base voltage of about 0.61 V and a collector voltage of about 0.85 V. I also […]

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Linear dropout voltage transfer function

I am reading this application note from Texas instrument : http://www.ti.com/lit/an/slyt187/slyt187.pdf?ts=1591543592096&ref_url=https://www.google.fr/. The application note give us the transfer function Vout/Iout of an LDO built with a PMOS. Here is the model : Here is the transfer function : where R12 is equal to : I have actually some troubles to understand why Rds is in […]

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SMPS Transformer Area of Product

I’ve calculated the area of product needed for transformer, it’s 71cm^4, but in core datasheets there is not value with cm^4 unit for example: https://www.tdk-electronics.tdk.com/inf/80/db/fer/e_65_32_27.pdf, am I missing something here? How can I choose a core for calculated area of product in cm^4 https://www.ti.com/lit/ml/slup126/slup126.pdf

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Linear dropout voltage transfer function

I am reading this application note from Texas instrument : http://www.ti.com/lit/an/slyt187/slyt187.pdf?ts=1591543592096&ref_url=https://www.google.fr/. The application note give us the transfer function Vout/Iout of an LDO built with a PMOS. Here is the model : Here is the transfer function : where R12 is equal to : I have actually some troubles to understand why Rds is in […]

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Ask Engineering

Linear dropout voltage transfer function

I am reading this application note from Texas instrument : http://www.ti.com/lit/an/slyt187/slyt187.pdf?ts=1591543592096&ref_url=https://www.google.fr/. The application note give us the transfer function Vout/Iout of an LDO built with a PMOS. Here is the model : Here is the transfer function : where R12 is equal to : I have actually some troubles to understand why Rds is in […]

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Sending AT commands from Arduino Nano to ESP8266 does not work

I want to connect an Arduino Nano with a ESP8266 Wifi Module to send data to a Webserver. I think about to use AT commands to the ESP8266 for connection and sending data. For that, I have started with this tutorial: https://create.arduino.cc/projecthub/ahmedibrrahim/iot-using-esp8266-01-and-arduino-afa35e In the section “Changing the ESP8266-01 communication speed” he is trying to change […]

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Linear dropout voltage transfer function

I am reading this application note from Texas instrument : http://www.ti.com/lit/an/slyt187/slyt187.pdf?ts=1591543592096&ref_url=https://www.google.fr/. The application note give us the transfer function Vout/Iout of an LDO built with a PMOS. Here is the model : Here is the transfer function : where R12 is equal to : I have actually some troubles to understand why Rds is in […]

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Ask Engineering

Linear dropout voltage transfer function

I am reading this application note from Texas instrument : http://www.ti.com/lit/an/slyt187/slyt187.pdf?ts=1591543592096&ref_url=https://www.google.fr/. The application note give us the transfer function Vout/Iout of an LDO built with a PMOS. Here is the model : Here is the transfer function : where R12 is equal to : I have actually some troubles to understand why Rds is in […]

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Good APA 102, SK9822, WS2812B alternative?

I know it’s an old question but many posts about the issue are several years old, so maybe the market has changed since, hence my question: I’m designing a Raspberry Pi compatible device for a client similar to an already existing device, which uses APA102 SPI controlled LEDs. Ideally I want my client to have […]