When I was signing up for the TOEFL test I figured that there was no easy way to find a TOEFL test location nearby. This is why I wrote a small tool that lists all test locations, test dates and test fees world-wide:
I hope you find it useful!
Besides the IELTS-Test, TOEFL is one of the most popular and recognised English certifications world-wide. Mostly, a TOEFL certificate is required when applying for an English study programme. However, also certain jobs require TOEFL as a proof of English proficiency as well as certain countries in order to fulfil immigration or visa criteria.
This little circuit allows to connect a LED to line voltage. Two issues have to be solved for that: LEDs cannot cope with such a high AC voltage, and the current has to be limited to ca. 15mA. The first issue is simply solved with a diode that eliminates the voltage in reverse-biasing. To limit the current of the LED a capacitive resistor is used.