There are alternatives on the market with 4 TR2516T1 ultrasonic transmitter plow transmitter 25kHz 16mm dimensions, the output of which is installed on the CD4093A integrated circuit of the ultrasonic dog repellent circuit, powered by BSS88 mosfets. Output peak... Electronics Projects, Powerful Ultrasonic Dog Repeller "analog circuits projects, " Date 2020/02/06