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I can not get the voltage clamped with the diodes

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I have the following simple circuit. When I trigger signal comes into Q1, at P1 a negative spike will be generated and it will be used to excite a transducer. This transducer also acts as a receiver, so the returned signal will be picked up at CH1AO. To protect the circuit after CH1AO, I add two diodes to clamp the voltage. However it seems I can not get it to work. Anybody can me any suggestions? Thanks a lot.
 

Antiparallel diodes D3 and D4 just limits the voltage excursions on P1 to +0.7V or -0.7V. You must check if it is allowed for CH1AO.
 

If you will add info about voltage current and timing requirements for transducer and circuit connected to CH1AO then it will be possible to guess something .

Till that your question is equation with many unknowns nobody will wish to deal with .
 

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