Led voltmeters with 3 decimal places are surprisingly well calibrated
Bought these two LED voltmeters from different vendors at different times. Total cost was about £11. Both meters have 5…
Arduino in 10 minutes – blinking led and 16×2 lcd
Spent an hour or so playing around with an Arduino Uno. First got the LED blinking program to run at…
Aa/aaa battery charger review
A round up of 10 different AA and AAA battery chargers. Serious contenders are the Powerex Maha MH-C9000 WizardOne Charger-Analyser,…
Electroluminescent el wire tutorial
EL wire just isn't very bright. It reminds me of the first LEDs which could only be used as indicator…
Gu10 spot light uses cob chip on board led
A new breed of GU10 LED spotlights are coming to market using COB (chip on board) LEDs.
World’s shortest microchip pic flashing led program
Now consisting of just 2 instructions, this must be the world's shortest Microchip PIC flashing LED program. And this time…
How to fix a computer monitor by replacing electrolytic capacitors
My computer monitor has been playing up recently. It was taking numerous attempts pushing the ON switch before the display…
Program 12f683 with microchip pickit3 in programmer-to-go mode
I use Microchip's PICkit3 to program the firmware into the 12F683 for my PWM5 Solar Charge Controller. In programmer-to-go mode…
1602 lcd module blew up my power supply – a cautionary tale!
Not all 1602 (or 16x2) LCD modules are 100% compatible with eachother. Most are, but I found this red one…
555 timer oscillator driving led or loudspeaker
Simple 555 oscillator circuit with LED on the output pin. But at high frequencies the LED isn't any use so…