Mbira

Is there any difference in diodes (not zeners) other that max current rating and footprint?  Don't they all do the same thing?
Joel Laviolette

Rattletree   |  https://www.rattletree.com
The Rattletree School of Marimba | https://www.learnmarimba.com


PRR

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #1 on: June 03, 2006, 01:57:56 AM »
Uhhh... Voltage rating?

And in some situations: forward voltage drop, reverse recovery speed.

Ptownkid

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #2 on: June 03, 2006, 08:06:00 AM »
yeah, the voltage rating is just slightly important :wink:

Mbira

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #3 on: June 03, 2006, 11:25:00 AM »
I forgot to mention voltage rating.  Now looking at the datasheets, I was thinking that the different 1n40** had different amps, but they are different voltages.
Joel Laviolette

Rattletree   |  https://www.rattletree.com
The Rattletree School of Marimba | https://www.learnmarimba.com

Mbira

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #4 on: June 03, 2006, 11:26:13 AM »
So for the most part, any diode that has a high enough voltage and current or higher can be used in say a rectifier situation?
Joel Laviolette

Rattletree   |  https://www.rattletree.com
The Rattletree School of Marimba | https://www.learnmarimba.com

Kit

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #5 on: June 03, 2006, 11:47:57 AM »
Quote
So for the most part, any diode that has a high enough voltage and current or higher can be used in say a rectifier situation?


Well, yes. Kinda.

But you really have to look at all parameters in a given design to choose a component that will last.
And beware of charge current in a PSU, its larger than it looks like at first glance.

I read a good article about diode ratings somewhere, not long ago.
I´ll try and find the link for it...
"Relaxing on the axis of the wheel of life."

nacho459

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #6 on: June 04, 2006, 03:02:30 AM »
I have a box of 1N4007's that I use whenever a circuit calls for a 1N40-- diode. I was led to believe that the 1N40-- were the same things but rated for different voltages, and that the 1N4007's were rated at 1000v.

I realize I may be totally wrong.

CJ

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #7 on: June 05, 2006, 02:40:27 PM »
got a snubber article here if interested...
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

PRR

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #8 on: June 05, 2006, 03:59:46 PM »
> I was led to believe that the 1N40-- were the same things but rated for different voltages, and that the 1N4007's were rated at 1000v. I realize I may be totally wrong.

They are just voltage grades. 1N4001 used to be cheaper than 1N4007. Still is $0.002 cheaper in crate-lots. If you order DIY quantities, ten or a hundred: the price difference between 001 and 007 is lost in overhead and round-up and ten-for discounts and profit margin. May as well buy a baggie of 1N4007 and use them everywhere you need a <1A <1,000V rectifier.

gyraf

Haven't posted a stupid newbee question in a while-diodes!!
« Reply #9 on: June 06, 2006, 03:01:43 AM »
..and sometimes - reverse leakage current. Important in e.g. the 1176 rectifier circuit..
..note to self: don't let Harman run your company..


ulysses

    Mississippi River, halfway between the North Pole and the Equator
  • Posts: 113
Haven't posted a stupid newbee question in a while-diodes!!
« Reply #10 on: June 06, 2006, 04:41:56 AM »
Don't forget about things like the capacitance of the diode, and the switching speed.  These things are especially important in applications like high-speed switching power supplies, and low-level signal detecting circuits like, for example, the sidechain of a compressor.  Then there's noise, which comes into play when you use a diode to bias the output stage of an amplifier (such as a discrete op amp).  In power supplies, you get to filter out the noise with a bunch of capacitors.  In circuits where you don't get to do that, you need low-noise diodes.
Justin Ulysses Morse
Roll Music Systems
Minneapolis, MN

www.rollmusic.com
Think outside the box.



 

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