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International modul

Posted: Fri Oct 24, 2014 10:52 am
by Danishm8
I’m on an It technology education i Denmark.
we are having a International module with in cloud some kind of an international aspect.

This forum hopefully is going to be my aspect.

Now my project and problem. Where i need your help.

I’m making a ultrasound system:
I already made one with a transmitter and receiver.
But my problem is that i only have 30cm of range and i would like to have 8-10 meter.
receiver circuit
receiver circuit
receiver sensor.jpg (135.35 KiB) Viewed 15343 times
Transemitter circuit
Transemitter circuit
Transemitted.jpg (35.59 KiB) Viewed 15343 times
If the attachment dosen't work i wuld like some help for that to. :)

What i would like you to do is to guide me on what needs to be done for achieve my goals.

Best regards
Michael (Denmark)
It technology student

Re: International modul

Posted: Thu Mar 12, 2015 2:25 pm
by Richard
I think there may be an error in the transmitter circuit. The bottom end of the 4.7k RP should be disconnected from R2 and pin 3 of the LM555, and instead connected to the +9 v rail (pine 4 & 8 of the LM555). Pin 3 should be connected to the top end of R2 only.