[Tom] used a Teensy 3.1 Arduino compatible board ... provides a simple interface display for changing the output. A dial encoder allows for direct adjustment of the frequency.

We’re no strangers to looking at uncapped silicon. This time around it’s not just a show and tell, as one transistor form a ULN2003 chip is reverse engineered. The photo above is just one ...

Arduino Real Time Alarm Clock DS3231 with TM1638. Arduino Clock with Battery backup (real time clock), Time, Date, Alarm, Temperature, TM1638 seven segment module output and input, Display Sleep mode.