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Electronic connection / about SD card

« Last post by yumi on May 20, 2022, 10:37:33 PM »

The SD card reader is a lightweight and compact base device. To connect successfully and begin using it, simply insert the SD card into the SD card reader in the correct direction. Some SD card readers require you to insert the SD card upside down. The device is then connected to another electronic terminal (such as a laptop) to view the files on the SD card.
https://www.apogeeweb.net/electron/what-is-an-sd-card-reader.html

Open Chat / a NAND Gate

« Last post by yumi on May 11, 2022, 11:16:12 PM »

Version of CMOS

The 4011 is a standard 4000 series CMOS IC with four independent, two-input NAND gates.

Figure: NAND Gate Diagram in a CMOS Type 4011 Integrated Circuit.

Availability

Most semiconductor companies, such as Fairchild Semiconductor, Philips, and Texas Instruments, sell these devices. These are typically available in both through-hole DIL and SOIC configurations. Most datasheet databases have datasheets readily available.

https://www.apogeeweb.net/electron/what-is-a-nand-gate.html

Open Chat / A Hardware

« Last post by yumi on May 03, 2022, 10:36:14 PM »

I have learned an article about THREE PRONG PLUG,you can go and have a look~

https://www.apogeeweb.net/electron/what-is-the-three-prong-plug.html

Questions and Answers / question of A Hardware

« Last post by yumi on March 26, 2022, 04:47:59 AM »

I have learned an article of IRFP260:https://www.apogeeweb.net/circuitry/irfp260-power-mosfet-datasheet.html

I would like to know HOW CAN I INSTALL THE IRFP260?

Ham Radio Circuits and Repair / Looking for a repair shop for my ICOM IC-746 PRO

« Last post by Carl Schultz on February 25, 2022, 12:10:07 AM »

Got an IC-746PRO from a friend. It has 2m side working fine. HF side no receive. I went to Broadcast band and can hear AM but it is like s3, not 20/9 as it should be. Just get noise on HF bands. Have not checked the RF output on HF yet.

Unit is in good looking condition, nothing looks burned or dented. Looking for a shop or individual to fix. Also do not want to exceed the value (used). I have a fine working IC-746 I have used for comparison.

Something in the receive. front end.

Thanks, 73, WF6J, Carl

Hardware talk / Re: A Hardware

« Last post by yumi on February 17, 2022, 03:23:42 AM »

The HT16K33 is a multi-function LED controller driver with memory mapping. The device has a maximum display segment number of 128 patterns (16 segments and 8 commons) and a 13*3 (MAX.) matrix key scan circuit. The HT16K33's software configuration features make it suitable for a wide range of LED applications, including LED modules and display subsystems. The HT16K33 communicates with most microcontrollers via a two-line bidirectional I2C bus.

https://www.apogeeweb.net/circuitry/ht16k33-led-controller-driver-datasheet-pdf-arduino-applications-faq.html

Open Chat / What does last letter stand for?

« Last post by ROSELJR on February 09, 2022, 10:27:14 PM »

What does the last letter of the button battery CR2450B and CR2450N stand for?
Details of CR2450: https://www.utmel.com/productdetail/fdkamericaincamemberoffujitsugroup-cr2450-4756792

Open Chat / QFN package need to be grounded?

« Last post by ROSELJR on January 13, 2022, 09:28:11 PM »

Do the thermal pads of TI's QFN packaged chips need to be grounded?
Introduction of QFN package: https://www.utmel.com/blog/categories/integrated%20circuit/the-introduction-to-qfn-package

Hardware talk / A Hardware

« Last post by yumi on January 08, 2022, 03:53:02 AM »

The AD8221-EP is a gain programmable, high performance instrumentation amplifier with the highest CMRR over frequency in its class. The CMRR of today's instrumentation amplifiers drops off at 200 Hz. The AD8221-EP, on the other hand, maintains a minimum CMRR of 80 dB to 10 kHz at G = 1. The AD8221-EP's high CMRR over frequency allows it to reject wideband interference and line harmonics, greatly simplifying filter requirements.

https://www.kynix.com/components/AD8221-Instrumentation-Amplifier-CAD-Models-Datasheet-PDF-Features.html

Electronic connection / What is the turn-on voltage of the diode?

« Last post by ROSELJR on December 21, 2021, 10:01:27 PM »

What is the turn-on voltage of the diode when the input of PC817 is turned on? What is the turn-on voltage of the phototransistor when the output of PC817 is turned on?
Introduction of PC817:https://www.utmel.com/components/pc817-photocoupler-application-pinout-and-datasheet?id=296