i am a student working on ultrasonic mosquito repeller project.
there are 2 theories about frequencies to repel mosquitoes. One is to mimic the frequency of male mosquitoes made(11-12khz) and one was to mimic the frequency that bats made(36-38khz).
Most product on the market is using the one around 10khz.
i was wondering whether i should amplifier the output power to increased the signal strength since the output power from the 555 timer is very very low.what type of amplier should i use and whether it could cause disturbance to human ear since human audible is within the limit of 20khz.
and also what type of transmitter and also a receiver to be used is suitable(is it difrent for difrent power?)? receiver is to detected the signal and to be observed on oscilloscope....thanks
there are 2 theories about frequencies to repel mosquitoes. One is to mimic the frequency of male mosquitoes made(11-12khz) and one was to mimic the frequency that bats made(36-38khz).
Most product on the market is using the one around 10khz.
i was wondering whether i should amplifier the output power to increased the signal strength since the output power from the 555 timer is very very low.what type of amplier should i use and whether it could cause disturbance to human ear since human audible is within the limit of 20khz.
and also what type of transmitter and also a receiver to be used is suitable(is it difrent for difrent power?)? receiver is to detected the signal and to be observed on oscilloscope....thanks