Powering an Ultrasonic Transducer
(HackaDay) [Lindsay] has a wonderful writeup about a new toy in the shop, an ultrasonic transducer. The 28kHz, 70W bolt-clamped Langevin transducer by itself is not much use, you need a power supply, a horn to focus the energy, and a way to tune it. [Lindsay] s
Update update feed set failed_fetches=0, fetched=current_timestamp() where feed_id = 3433 failed: 1142 [UPDATE command denied to user '334187_hdlns_ms5'@'10.187.248.89' for table 'feed'] in [update feed set failed_fetches=0, fetched=current_timestamp() where feed_id = 3433]
updated 3433 (Hack a Day), inserted 15, updated 0, at 2012-05-27 20:44:47
