The Curious Engineer

All blogs / Electronics

Dilshan R Jayakody’s Web Log

jayakody2000lk.blogspot.com

This blog contains electronics, amateur radio and computer-related open source projects which I did in my free time.

ElectronicsHam radio / RFEmbedded / microcontrollersAudio / hi-fi

’10’15’20’25
Posts
272 from 6 Jun 2008 to 27 Oct 2026
Posting
monthly (12 in the last year)
Kind
personal blog
Feed
https://jayakody2000lk.blogspot.com/feeds/posts/default

2026 10

  1. Flash C - Compiler
  2. Diagnosing and repairing an Audio-Technica AT-LP120-USB motor driver
  3. Building a Dual V100 AI Workstation for Local LLMs
  4. Tiny Basic for Arduino
  5. Building the TD4 4-Bit CPU
  6. TDA2005 as a DC-to-DC Converter
  7. ZZRX-40 Receiver build
  8. A DIY build of a two-tube FM receiver kit
  9. OpenHamClock Kiosk
  10. Discrete CMOS digital desk clock

2025 12

  1. FA-5 VizControl
  2. Surge arrester array
  3. Arduino Mini Amplifier
  4. A simple transistor based electronic siren
  5. Electronic fluid level controller
  6. Ecowitt weather station to APRS bridge
  7. Open source 24-channel USB high-voltage driver
  8. 4-Element Yagi antenna for the 2m band
  9. RDA5807M FM stereo receiver module
  10. Resolving Keyboard Issues on the Sony ICF-SW7600GR
  11. Analog pink noise generator
  12. Decoding the LM386

2024 6

  1. Programmable Music Module
  2. Building an experimental monolithic kernel
  3. Adapting HX711 modules for 3.3V Operation
  4. Alarm unit for limit switches or flow switches
  5. RDS Data Extraction with RFtap and Wireshark
  6. Another Pioneer PL-250 restoration

2023 2

  1. Echo Generator for Microphones
  2. Universal HD44780 LCD interface

2022 8

  1. 6-channel speaker selector
  2. 5.1 channel analog audio processor
  3. Onkyo PE-C50 stereo graphic equalizer repair
  4. Virtual electronic finderscope for the Stellarium
  5. Portable Image File (PIF) library for Lazarus and Delphi
  6. Experimental narrowband FM receiver for 2-meter band
  7. Wireless Call Bell
  8. Infrared remote control clone utility

2021 18

  1. TPA3001D1 Power Amplifier
  2. STM8S005C6T6 Ethernet development board
  3. 5.1 channel preamplifier
  4. Corsair VS550 Power Supply Repair
  5. Arduino superheterodyne receiver
  6. Active subwoofer filter circuit
  7. FM Radio add-on for Raspberry Pi
  8. Universal logic probe
  9. Arduino telephone caller ID unit
  10. TDA7052A - DIY miniature amplifier
  11. 12V Uninterruptible Power Supply
  12. STM8S001J3 based Programmable timer module
  13. SD card extension for OpenFAT library
  14. NTP based digital clock panel driver
  15. FM stereo receiver module
  16. I2C master mode emulator
  17. Clock module with seven segment display
  18. A DIY UV exposure unit

2020 8

  1. μSim: PICmicro instruction simulator
  2. Low cost Carbon Monoxide meter
  3. Experimental Zener Diode Tester
  4. NOAA weather satellite reception
  5. Experimental motor driver for CG-4 German equatorial mounts
  6. MCP4141 based digital potentiometer
  7. AVR High Voltage Programmer 2
  8. 24-bit Stereo Audio DAC for Raspberry Pi

2019 17

  1. 4 Port high power USB hub
  2. Configuring ADSL router for SLT PeoTV
  3. FM stereo radio receiver with RDS
  4. USB Morse Keyer
  5. Verification module for PT8211 DAC
  6. Replacement driver for Honeywell CL15AE
  7. Simple NTP clock using USB display module
  8. USB seven segment display module
  9. 1750Hz tone generator
  10. Generate DTMF tones only using Arduino
  11. Arduino interface for TFA9842AJ Power Amplifier
  12. Replacement motor driver for mini drills
  13. Programmable light controller
  14. Lightning arrester installation
  15. TCS230 based Bluetooth color picker
  16. 13.8V 5A Power Supply
  17. Simple I2S stereo decoder with amplifier

2018 12

  1. BMP180 based USB atmospheric pressure monitor
  2. RTC based automatic LED lamp
  3. HC-06 Bluetooth module programmer
  4. How to resolve Windows 10 IoT core provisioning file flash failure
  5. Multichannel logic probe and pulsar
  6. Sensor framework for Data Logging
  7. ICOM IC-R71A receiver restoration
  8. Banana Pi DLNA media server
  9. AF signal injector and tracer
  10. 6 channel speaker selector
  11. Electrical wiring of the house
  12. Automatic fan controller for server racks

2017 10

  1. Network cable tester
  2. Restoring Sony STR-AV780 AV receiver
  3. Yet another CXA1191 FM radio receiver
  4. 8-bit assembler compiler project
  5. Adjustable constant current source
  6. Restoration of Philips 852 - 22RH852 turntable / tuner
  7. Enable WebRTC on QtWebEngine for Raspberry Pi 3
  8. Reel to reel tape cleaner
  9. Telefunken HiFi Studio 1 restoration
  10. Sony TC-252 reel to reel player restoration

2016 19

  1. Pioneer PL-250 turntable restoration
  2. HTML5 Mandelbrot Generator
  3. 100W AF dummy load
  4. Extending the frequency range of Pioneer TX-7700 tuner
  5. μPC1237 based 2 channel speaker protector
  6. CoCA Emerge + Tech - Musical plants project
  7. Sony TC-500 reel to reel player restoration
  8. Modified Heathkit HD-1410 electronic keyer
  9. Simple crystal tester
  10. USB curve tracer for NPN transistors
  11. Automatic monitor brightness controller
  12. Low voltage power supply unit
  13. Mullard 3-3 Amplifier Project (Part 3)
  14. Artificial star unit
  15. Mullard 3-3 Amplifier Project (Part 2)
  16. Simple door bell for access control systems
  17. Musical trees
  18. Victor SEA-50 graphic equalizer restoration
  19. Mullard 3-3 Amplifier Project (Part 1)

2015 29

  1. Light operated voice messenger
  2. 74181 ALU design on Altera MAX II CPLD
  3. Replacement LED driver for AN6877
  4. ZFM-20 fingerprint capture library
  5. Dynamic microphone preamplifier
  6. 48V Phantom power supply
  7. DIY resistor box
  8. Low cost TEA5767 based FM stereo radio receiver
  9. Calculator for audio output transformers
  10. USB to 3.3V - 5V serial TTL adapter
  11. Soldering station to drive HAKKO 907 handles
  12. Contactless DTMF switch
  13. UC3844 base motor speed controller
  14. EAGLE BOM generation script
  15. FlashProg - USB serial flash memory programmer
  16. CD2003 - yet another simple FM radio receiver
  17. 3A Power supply for USB devices
  18. Low cost DC millivolt source
  19. 4 way Stereo Unbalanced Distribution Amplifier
  20. AVR-HV: High voltage programmer for AVR microcontrollers
  21. BFO for SSB Reception
  22. Two transistor superheterodyne shortwave receiver
  23. Simple Telephone Locator Light
  24. SL414 Vintage power amplifier IC
  25. Digital data capture unit with EMF reader
  26. Low power FM stereo transmitter
  27. 100W RF dummy load
  28. ImageHide: Digital image based steganography tool
  29. Homebrew Audio Signal Generator

2014 23

  1. VHF Aircraft radio communications receiver
  2. Simple Automatic Car Battery Charger
  3. Homebrew 5 element Yagi antenna for 144MHz
  4. Simple CMOS FSK modem
  5. Optically controlled servo motor
  6. Digitally controlled 2.1 channel analog audio power amplifier
  7. Trio JR-310 and TX-310 restoration project
  8. Eddystone EC10 communication receiver restoration and PSU add-in
  9. Panasonic RX-5090T power amplifier repair
  10. 6AS5 and 6N2P vacuum tube base guitar amplifier
  11. Simple RdRand base random number generator library
  12. Analog AC line monitoring box
  13. Digital audio amplifier with PLL synthesized FM radio
  14. Workshop Organizer - inventory controller for home-workshops
  15. Hi-Fi Audio Power Amplifier for experiments and general use
  16. Audible Morse code to text message converter
  17. 300V AC/DC Variable Power Supply
  18. Audio / Visual Morse code Generator for Android
  19. Home produced 700VA isolation transformer
  20. ATmega169 base 8bit Arithmetic and Logic Unit
  21. Oscillator Controller for 8bit PIC Microcontrollers
  22. 3.3V Power Supply Unit
  23. Extended Run dialog box for Windows

2013 20

  1. DIY 3W constant current LED driver
  2. ParseGen - parser generator for FPC
  3. microTone Module - Simple Analog Hardware Interface
  4. Centralize power switch for PC arrays with power failure monitor
  5. LMD18245 base Microstep Motor Driver
  6. USB Random Number Generator
  7. Microprocessor Controlled 16 Line Connectivity Tester
  8. Simple High Bright LED Night Light with Dimmer
  9. USB Custom Hardware Interface for Unity3D
  10. Classical Brute Force Attacker for Sudoku Puzzles
  11. Smart Audio Box
  12. Easy to Build Adjustable Dual-Rail PSU
  13. Command-line driven Intel HEX file decoder
  14. Electronically Controlled Nichrome-Wire Cutter
  15. Refurbish C64 Power Supply Unit
  16. DIY Liquid Level Monitor and Automatic Control System
  17. Replacement Code Lock for LS7220 base Systems
  18. PT2399 base Echo Sound Effect Generator
  19. nanoide – custom build tool with source editor
  20. Simple ATmega325 Development Board

2012 18

  1. LEDShoot - Electronic LED Shooting Game
  2. PalindromicGen - Search for Palindromic numbers
  3. DIY Surround Sound Dock for Apple iPods and iPhones
  4. LASER Based Gate Keeper
  5. Project Profile Post - Project Description Suite
  6. Shopping with Lankatronics.com and Aptinex
  7. Offline High Voltage AC Power Supply
  8. TENMA 72-9390 Pen Style Multimeter
  9. LiteASM - Light Weight & Customizable Assembly Compiler & Virtual Machine
  10. Precision Event Logger
  11. 5V 5A Bench Power Supply
  12. Simple 8bit digital data logger using PIC16F887
  13. Extend PIC Microcontroller‘s RAM by without using EMI
  14. AT89S2051 base 8bit Bus Monitor
  15. Kidogo : 8 channel USB Digital Signal Injector
  16. Yet another PIC development board
  17. Microscopic view of EEPROM IC
  18. Homemade 2.1 Audio Power Amplifier System

2011 11

  1. Digitally Controlled Audio Power Amplifier with Virtual Surround Sound
  2. An open scriptable USB interface for host driven electronic experiments
  3. Microprocessor controlled CW Beacon
  4. Ultra Simple Microchip PIC Development Board
  5. XBMC USB Controller for Media Center PCs
  6. PIC16F877A/PIC16F887 Microcontroller Development Board
  7. Mini Servo Controller
  8. Open Hardware Logo Selected!
  9. Electric Fence with Automated Monitoring System
  10. 32W Hi-Fi Audio Power Amplifier using TDA2050
  11. DIY UHF/VHF TV Antenna

2010 15

  1. Programmable Home Security Alarm System
  2. Low Voltage Simple Motor Speed Controller
  3. 2 Channel Electronic Motor Speed Controller
  4. Processing OpenOffice.org dictionary files using Lazarus
  5. Fixing the "Self Checking" problem of Panasonic DMR-E55 DVD Video Recorder
  6. 8 Channel USB Logic Analyzer
  7. 8 feet - home made C band satellite dish antenna
  8. Repairing Sony PlayStation 2 Game Console
  9. Electronic Number Panel
  10. Virtual MCU Base Programmable Timer
  11. 8 pin 2 digit seven segment display driver
  12. Ultra Simple Stereo Computer Speaker Driver
  13. A7VVYNHHASU7
  14. 4 Channel Remote Control Video Switch
  15. Homemade ADSL Splitter

2009 20

  1. Servicing Heathkit IO-12 Oscilloscope
  2. Mini Sudoku for Windows
  3. 12V DC to 230V AC Inverter
  4. Automated Home Security System
  5. 20W Hi-Fi Audio Power Amplifier
  6. Low Dropout Single Rail Adjustable Power Supply Unit
  7. AT89S52 base RPM counter
  8. PHPhD – Server side hardware port access extension for PHP
  9. Low Cost and High Quality Stereo FM Radio Receiver
  10. 433MHz RF remote control system for RC Cars
  11. Finding electronic parts and instruments in Sri Lanka
  12. Compact logic probe with pulser
  13. 1.5A - 3V to 27V adjustable power supply using LM723
  14. PS/2 Keyboard driven Morse code Generator
  15. User Programmable Automatic Night Light
  16. 3.3V – 1.5A Compact Power Supply Unit
  17. Automated Telephone Remote Control – Demonstration
  18. Low cost and low power VIA PC-1 Series mainboards
  19. Prithvi Development Studio for PIC Microcontrollers
  20. Simple ATMEL AVR – Programmer

2008 14

  1. Simple method to decompile (Microsoft HTML Help File) CHM files
  2. 9 Pin dot matrix printer using PIC16F84A
  3. Essential USB Specifications and Develop embedded systems with USB
  4. Is Delphi for PHP successes ?
  5. Design USB Devices and interface them using Delphi
  6. About Thoppigala 3D Computer Game
  7. Simple Variable Zener Diode
  8. Notable 3D Game Engines – Part1
  9. Special Task Force Game – System Implementation
  10. Home-produced USB Sound Card
  11. 13W x 4 Audio Amplifier with Surround Sounds
  12. Open Source 3D First Person Shooter – Special Task Force
  13. My PIC16F73 base Digital Alarm Clock
  14. Welcome to My Web Log