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circuit problem

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JoeyAndres

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If I connect the output of two reciever to a transistor, something happens that should not
 

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Yeah, still no information, but the circuit doesn't look like it will work - a 741 isn't going to give you a gain of 1000 at 40KHz, and you seem seriously lacking in decoupling capacitors.
 
All ICs need 100nF across their supply pins and replace the crappy 741 with a TL081. The you stand some haf decent chance of it working..
 
I only use 24khz, I only copied this schematic from the internet, I use a very high gain op-amp opa27, the current to voltage convertor resistor is 330ohms is replace by 1mohms, and the feedback resistor is also replace with 1M. Thanks for all of your reply, but I already solved my problem, I just replace the input capacitor 10000pf to 1000pf, to cut off half of the frequency.
 
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