Volkswagen and Indian newspaper Times of India never fail to surprise Indian readers with their advertisement campaigns. When they launched the Vento, the newspaper played their jingle when the reader opened the page, this was followed by a metallic print ad for the sedan variant, Times also had featured an ad that had scented pages ..
Today mornings copy of the times gave me a shiver of excitement.. The page literally vibrated. Flipping over the paper revealed the secret. A small black color pod with an LDR was behind the mischief.
The LDR was a clearcut giveaway as to how the circuit was working, and I anticipated that it was a simple example of using transistor as a switch. However that did not satiate my curiosity. The thingie was glued to the paper and I proceeded to remove it. A closer inspection revealed that the back was only a black dual sided tape.. sort of 3M variety.
I then proceeded to remove the tape to see the device guts and confirm my guess.
This is just the dump of the circuit… however it opens a load of possibilities like modding it into a laser tripwire or better still replacing LDR with a PIR sensor and the motor with a buzzer maybe.
I will analyze the circuit more deeply and share the findings… its no rocket science, but its good to relearn or basics.