Hello,
got a pair of ultrasonic transducers(40khz) and want to use them with arduino. Just can't find any good circuit the build the module of the transducers. So i basically want to transducer reciever to be a basic lm386 amp one. The h-bridge must/can be a 555 timer one. Please give me the schematics. Regards.
There used to be a set of schematics for the Devantech SRF04 online.
That uses a PIC (IIRC) and a MAX232 to drive, but you could dump the PIC and use a 555.
Can't remember what the rx amplifier is, though.
For the transmitter, i know i could use a 555 timer but the schematics. Tried to find a lot and could not find any.(Google really didn't help this time 
)
Google must be broken where you are.
First hit.
Actually, the circuit is just too hard and i don't think i can get those ICs from my local store. Something easy please ?
the circuit is just too hard
But it has been around a long time, and it works.
Unless you have, and know how to use, an oscilloscope, I'd advise against building your own.
Oooops, I didn't notice it the same OP.
So i basically want to transducer reciever to be a basic lm386 amp one. The h-bridge must/can be a 555 timer one. Please give me the schematics.
You can't use lm386 as receiver amplifier , as it's Power Amplifier.
Probably, you can build a bridge with couple lm386 to drive a transmiter, or better hack ANY audio power amplifier (including your radio/cd player/active speakers).
The same with receiver, ANY mic amplifier could be easily modified to accept 40 kHz as input. Replacing Just 1 or 2 cap that define upper frequency.
If you can't find a schematic with "ultrasound" included in search pattern, try "audio " instead,
there are zilllions of them.