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Author Topic: What these diodes do?  (Read 1863 times)

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Offline birdcheeTopic starter

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What these diodes do?
« on: August 29, 2008, 10:00:02 PM »


actually i don't understand what are the functions of this connection.
thanks.

Offline RobD

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Re: What these diodes do?
« Reply #1 on: August 29, 2008, 10:12:20 PM »
If you were an electron (-) and wanted to go from the left side of the picture to the right side of the picture then you would only be able to go through the bottom diode.   

Offline izua

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Re: What these diodes do?
« Reply #2 on: August 29, 2008, 11:34:48 PM »
That's used as a distorsion effect in guitar amps (the cheap ones). Using leds makes it sound a bit more soft.
I've also seen this kind of schematic in a homemade EKG, its purpose was to protect the samples to discharge through the human body.
Check out my homepage for in depth tutorials on microcontrollers and electronics.

Offline birdcheeTopic starter

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Re: What these diodes do?
« Reply #3 on: August 30, 2008, 09:39:48 AM »
Hmm...I see I see.
Actually I saw this in the receiver circuit of ultrasonic ranger.
I'm not sure what are the exact funtions of it.

Offline RobD

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Re: What these diodes do?
« Reply #4 on: August 30, 2008, 10:07:12 AM »
Ahh...  It could be a detector for the receiver.  When the sinewave returns, the detector can sense the high and low transitions to change the state of an input pin.

Offline Admin

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Re: What these diodes do?
« Reply #5 on: September 04, 2008, 07:04:10 PM »
Sonar typically has really high voltages, like 300V or more . . . perhaps the diode is reducing the voltage of an AC signal?

 


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