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14 Results for "%EC%B2%AD%EC%A3%BC%EC%98%A4%ED%94%BC%EC%82%AC%EC%9D%B4%ED%8A%B8%E2%9E%9Coptime4.com%EC%B2%AD%EC%A3%BC%EC%98%A4%ED%94%BC %EC%B2%AD%EC%A3%BC%EB%A7%88%EC%82%AC%EC%A7%80 %E2%9E%9C %EC%B2%AD%EC%A3%BC%EC%98%A4%ED%94%BC%E1%99%93 %EC%B2%AD%EC%A3%BC%EC%98%A4%ED%94%BC%EB%B0%A9%EB%B2%95%E1%99%93 %EC%B2%AD%EC%A3%BC%ED%9C%B4%EA%B2%8C%ED%85%94 %EC%B2%AD%EC%A3%BC%ED%82%A4%EC%8A%A4%EB%B0%A9 %ED%83%80%EC%9E%84"

  • The Audio Interface
  • Log     from An Old Fashion Acoustic Modem for the iPhone
  • The Audio InterfaceConnecting the microprocessor (uP) to an 8 ohm speaker and to an 8 ohm speaker used as a microphone is tricky. Tricky if you want it clean (no PWM in the out put) and simple (i.e. low part count and garden variety components).Op AmpsThe...

  • July 7, 2023
  • Instructions     from Geopolymer experiments
  • Begin with 200ml filtered water from the fridge tap, carried in an empty coffee pot. Using 4-6 ratio to calculate. 10x20 = 200ml H2O 4 grams sodium hydroxide x20 = 80 grams NaOH 6 grams silica x20 = 120 grams Unfortunately we only have 92.8 grams of...

  • Unix on your breadboard
  • Instructions     from Unix on your breadboard
  • Connect USB cable to Fubarino and to your computer. Fubarino console will appear as a virtual COM port on your computer. Use any terminal emulation program (like putty on Windows or minicom on Linux) to connect to this virtual COM port at baud rate 115200....

  • Nixie drive voltage supply
  • Log     from State-Based Nixie Digital Voltmeter
  • Tail-end of last year we were working on a nixie tube clock project. It ended up getting stalled by some other stuff, but while Novak was working on the microcontroller code I was grinding out a power supply and drive circuits. For drive circuitry we...

  • 1Charger
  • Instructions     from 1Charger
  • Calibration1.   #define CALIBRATION in software and recompile and flash ATtiny8612. For each range make two measurements in order to calculate the line v=k*ADC + m. With this simple approach I get about  10-20mV and 10-20mA accuracy ( compared...

  • The completed unit
  • Log     from TL431 rogowski coil current sensor
  • As the prototype worked better than expected, clearly I needed to make something more robust and useful. Ideally mechanically solid, in a case, powered by a 12V wall wart, coax connection to scope and generally a lot nicer. 450A/V is going to be useful...

  • Professional PCBs
  • Log     from TL431 rogowski coil current sensor
  • Liam from PCBWay ( www.pcbway.com ) kindly offered to sponsor making some proper PCBs so I've designed a proper PCB with Kicad 6. So far, I'm impressed with the process. There's a plugin for Kicad that uploads the gerbers in one click. The position and...

  • r5B12 boards assembled
  • Log     from DIY programmable (SCPI) bench power supply
  • The new r5B12 PCBs arrived from ITEAD few days ago and I managed to assemble them to test if new added features are working as expected. All boards are now a little bit larger and I tried to keep the same mounting holes spacing as in previous builds.AUX...

  • Driving OLED Displays Directly
  • Hacker page     by deʃhipu
  • There are many monochrome OLED display modules available for really reasonable prices out there. They can be really useful for a small and simple display in a project. However, many libraries available for driving them are rather big and slow. In this...

  • Nothing Good Comes Easy
  • Log     from SubPos Positioning System
  • I wrote a simple Android application to decode the SSID and display it, unfortunately I am having a slight issue. Some control characters are handled incorrectly by the ScanResult class.Original string:\x53\x50\x53\x3a\x41\x55\x53\x00\x00\x63\x3b\x15\x0b\x07\x3b\x76\xff\x31\x07\x5b\xcd\x15\x9c\x80\x07\x00\x00\x20\x04\x00\x00Android...

  • Reversing Flash Read
  • Log     from µPy FT10
  • After finding a repository with software utilities for this chip, I tried to use the MPTool, which after first inspections seems to provide flash read, erase and write functionalities. When clicking the Detect button it lists all available COM ports...

  • Physical layer : wireless communication
  • Log     from digital-walkie-talkie
  • Theory Channel capacity Shannon-Hartley law: where C is channel capacity [bps], B is bandwidth [Hz] and S/N is signal/noise ratio. Example: dPMR (C = 4800bps, B=6250Hz).  So S/N must be at least 0.70. Number of bits/symbol needed Nyquist's Theorem...
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