package arrived very fast seller very recommended, it is the second one I buy, the first one arrived without connectors and related connecting wires. You have to pay attention to the polarity of the transducers, the one closest to the cone is the positive, moreover, you should disassemble the transistors 13009 and put some paste on the heatsinks, because it is totally missing. now I will try the second card as well and if it doesn't all work like the first one, I will update the review.

pacco arrivato molto velocemente venditore molto consigliato, è il secondo che compro, il primo è arrivato senza connettori e relativi fili di collegamento. Bisogna prestare attenzione alla polarità dei trasduttori, quello più vicino al cono è il positivo, inoltre, bisognerebbe smontare i transistor 13009 e mettere della pasta sui dissipatori, perche manca totalmente. ora proverò anche la seconda scheda e se non sarà tutto funzionante come la prima, aggiornerò la recensione.

package arrived very fast seller very recommended, it is the second one I buy, the first one arrived without connectors and related connecting wires. You have to pay attention to the polarity of the transducers, the one closest to the cone is the positive, moreover, you should disassemble the transistors 13009 and put some paste on the heatsinks, because it is totally missing. now I will try the second card as well and if it doesn't all work like the first one, I will update the review.

ultrasonic driver + 2x transducer as described; PROS: looks OK, well packed, all items included, delivered within a few days by courier from CZ; CONS: there is no documentation like schematic or connnection diagram included so you have to guess or reverse engineer PCB

ultrasonic driver + 2x transducer as described; PROS: looks OK, well packed, all items included, delivered within a few days by courier from CZ; CONS: there is no documentation like schematic or connnection diagram included so you have to guess or reverse engineer PCB

ultrasonic driver + 2x transducer as described; PROS: looks OK, well packed, all items included, delivered within a few days by courier from CZ; CONS: there is no documentation like schematic or connnection diagram included so you have to guess or reverse engineer PCB