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ericmar
Joined: 14 Apr 2004
Posts: 279
Location: Singapore
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 21 Aug 2004 16:25 How to choose the correct diode? |
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| As above. How do I know which type of diode I should use?
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And!
Joined: 20 Aug 2004
Posts: 1
Location: Poland
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| 21 Aug 2004 17:02 Re: How to choose the correct diode? |
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Where this diode will work ?
Write more information, your question is very general.
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Kevin Weddle
Joined: 10 Jul 2004
Posts: 101
Location: San Antonio, TX
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| 21 Aug 2004 18:06 Re: How to choose the correct diode? |
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| You want the current rating of the diode to be utilized. For rectifier applications the current goes from zero to a specified current. The diode is rated for average current with the peak current being very high. The way I find average current is to take the sine wave and break it into 16 equal parts. The discrete voltages are then applied to the impedance to find the discrete currents. Add the currents up and divide by 16 to give you the average current. Remember that the current of a capacitor is still the voltage divided by the impedance.
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 22 Aug 2004 8:07 Re: How to choose the correct diode? |
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| ericmar wrote: |
| As above. How do I know which type of diode I should use? |
You have not given us details and as rule of thumb: choose a general purpose rectifier.
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yeechyan
Joined: 14 Jun 2004
Posts: 111
Helped: 1
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| 24 Aug 2004 1:47 How to choose the correct diode? |
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| What are the working conditions you wish to put your diode into?
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ericmar
Joined: 14 Apr 2004
Posts: 279
Location: Singapore
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| 26 Sep 2004 7:43 How to choose the correct diode? |
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Maybe I should ask "What's a diode used for?"! Is it for limitting current only? I know it only allows current to flow trhough in one direction, right? What about Zener diode? I got a diode here labelled as 79 C6 V2, wat is it for? In fact, I'm studying on some circuits so I'm trying to understand why they used all these diodes for!
Thanks for help anyway!
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Borber
Joined: 01 Jan 1970
Posts: 1485
Helped: 111
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| 26 Sep 2004 10:25 Re: How to choose the correct diode? |
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| Diodes can be of different types. It could be rectifier, zenner, varicap, diac, PIN, LED, etc. Each diode type has it's own function in circuit and symbol in schematics. Get some knowledge about diode types and their symbols and the things when analyzing circuits will be easier.
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nicleo
Joined: 06 Sep 2004
Posts: 717
Helped: 60
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ericmar
Joined: 14 Apr 2004
Posts: 279
Location: Singapore
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| 26 Sep 2004 14:41 Re: How to choose the correct diode? |
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| nicleo wrote: |
You can find some very good information on diode (e.g. diode ratings) and its applications (e.g. rectifier) here:
[url=h**p://www.ibiblio.org/obp/electricCircuits/Semi/SEMI_3.html]h**p://www.ibiblio.org/obp/electricCircuits/Semi/SEMI_3.html[/url] |
This is definitely a very good site for a beginner like me! Thanks a lot! 
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starfish
Joined: 08 Jul 2004
Posts: 73
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| 30 Sep 2004 8:37 Re: How to choose the correct diode? |
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depends on ur application........
Using Si (silicion ) diode , u can turn it on by 0.7 volts threshold voltage.....
If u require less on voltage for particular application use Ge(Germanimu) diode....It's on voltage is 0.3 volts.....but Ge diodes have less power handling capability than silicon diodes.............
Zener diodes employ the zener characteristic regiion for use in particular applications.....In zener diodes the direction of conduction is opposite to that of the normal diodes .........
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