1. The problem statement, all variables and given/known data

for what purpose dodes are used in these projects.

I want to search those devices and projects in which diodes are use.
i have found six of them and found some incomplete information (without purpose of diode)
here are the projects,


http://www.electronickits.com/kit/co...lec/ck1600.htm
http://www.electronics-project-desig...orControl.html
http://www.electronics-project-desig...r-Circuit.html
http://www.electronics-project-desig...Amplifier.html



Efforts.
I am searching a lot for the purpose of diode in these projects for last 4 daysbut didn't find.
i've found the purpose of diode in these projects.

Radio
Power Supply
Guitar Distortion Pedal
Temperature Measuring Device
Logic Gates
Electronic Musical Keyboard

can anyone tell me what is the purpose of diode in these projects.

 

You have restated the same thing three times, but have not really defined a specific question that can be answered. For example, the first link you give links to a schematic that contains 4 diodes (zener, LED, 1N4148, 1N400X). Which diode's function is not clear to you? The second link you give leads to nothing. It is just something general about motor control.

1) You have spent 4 days studying this/these question(s). What partial solutions have you reached?
2) Have you read the AAC ebook on diodes?
3) I suggest that you draw the specific portions of the circuits that you do not understand and post each one as a question plus say what you think the purpose for each may be. I am not suggesting separate threads for each.

John

 

The OP needs to post specific circuits, as the post otherwise appears to be very close to spam.

 

Electronic Musical Keyboardi want to know the function of these diodes , 1N4148, 1N400X.

In the last four days i found about 8 pojects which are using diodes and i also manage to find the purpose of diode in those projects.
here is the list of projects,

Mobile Phone Incoming Call Detector
Telephone Audio Interface
Geiger Counter
Emergency (Police/Fire) Siren and Chime Electronic Circuits
Cell Phone Battery Charger
Amplifier
Infrared Remote Control
Electronic Musical Keyboard
Logic Gates
Temperature
Measuring Device
Guitar Distortion Pedal

 

Electronic Musical Keyboardi want to know the function of these diodes , 1N4148, 1N400X.

The first link is to a toggle switch. Is that what you are referring to? Here it is:

D2 is a protection diode for the inductive "kick" from the relay coil. Look it up in the ebook. D1 is a blocking diode. Ask yourself what will happen to the time constant for the down stream capacitor (C2) and resistor (R5) input to the 4013, if it were not there? Look at R3 and R4.

Copying and posting the schematic or circuit element is no big deal. But since this is homework on which you want help, you should make at least that effort.

John

 

Thanks alot....now i've understand the circuit little bit..can you tell me how did you identify for what purpose the Diodes are connected...?
i am just a newbie in all these

 

When you learn a little about electronic circuits then the function of the parts is obvious.