Has Anyone else used MJE13005's Switching Transistors for the output stage. - diyAudio
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Old 29th July 2005, 11:45 AM   #1
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Question Has Anyone else used MJE13005's Switching Transistors for the output stage.

Hello Everyone,
my local parts store lists MJE13005 8A NPN Switching Transistors in their Catalog.
as they were $1.78 each i thought i'd try them in My B Class Amplifier as i use a quasi-complimentary output stage using NPN's.
This Transistor is used mainly in Motor Switching circuits.

If you do a web search it is easy to find a data sheet.

i have been using them in my test amp for a few months with no problems.
I started with 2N3055's amd latter changed over to MJE15003's and to me the MJE13005's sound just as good or slighty better than the MJE15003's.
I normally Pay around $7.00 for MJE15003's
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Old 29th July 2005, 09:07 PM   #2
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Default I have used TIP142 and TIP147 as output darlington transistors

I think they distorted the trebles.

And i could read, in our forum, that they are not adequated, as we cannot adjust the internal emitter driver resistor.

Really made for switching purposes.

Treble distortion was boering.... really strange harshing, scratching sound....

The bass was very nice and deep, but a little unprecise too.... but the bass quality was more the amplifier fault than the darlington unit fault.

regards,

Carlos
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Old 29th July 2005, 09:29 PM   #3
MikeB is offline MikeB  Germany
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Hi !
You should be careful with switchingtransistors, typically they are
constructed for switching and can dissipate much power for only
very short time. Take a look to SOA diagrams...
(I guess you meant mj15003 ?)

Mike
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Old 29th July 2005, 11:09 PM   #4
tlf9999 is offline tlf9999  United States
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I think you will just be fine.

I have used TIP's in linear applications without any trouble. I have used IRF devices (designed exclusively for switching) in audio applications very successfully.

Transistors are transistors.
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Old 30th July 2005, 02:00 AM   #5
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I have used the MJE13005 in a switcher with the MC34166 controller and they worked quite well. I have a huge bunch leftover if anyone cares.
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Old 30th July 2005, 05:39 AM   #6
Enzo is offline Enzo  United States
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"Transistors are transistors" is a bit flippant and not very accurate. There is a big space between get away with and should have. Transistors are not all made the same nor designed to be universal. One would not say cars are cars - all share similarities but a Honda Civic is not a unlimited class dragster nor is it an offroad like a jeep or Hummer. That Honda won't be very happy pulling a large travel trailer over the mountains, even if you do get away with it. Likewise the dragster is not a good choice for driving to the grocery store. The DC ratings on the switching transistors tend to be much lower than the ratings for switchmode applications.

WHy did you select the MJE13005 by the way? It would seem the 2N3055A would be better for you. Just for sake of discussion I assumed 30v rails, so +/-30VDC. That means potentailly 60v across the part. At those voltages the MJE13005 is rated less than an amp while the 2N3055A still has a 2 amp rating. The MJE13005 is only a 75 watt part, while the 2N3055A is good for 115 watts. Of course if you are just using it for a low power amp, then none of that matters much.

And I am not sure about MJE15003. Did you mean MJ15003 or MJE15030? I don't find MJE15003. The MJE15030 is a TO220 like the MJE13005.
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Old 30th July 2005, 09:14 AM   #7
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Hello Everyone,
Here's the datasheet for MJE13005
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File Type: pdf mje13005.pdf (88.0 KB, 83 views)
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Old 30th July 2005, 09:44 AM   #8
tlf9999 is offline tlf9999  United States
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Quote:
Originally posted by Enzo
[BTransistors are not all made the same nor designed to be universal. [/B]

Absolutely true.

Quote:
One would not say cars are cars - all share similarities but a Honda Civic is not a unlimited class dragster nor is it an offroad like a jeep or Hummer. [/B]
That's a valid argument if you can show that this application is either drag racing or offroading, not driving the kids to the park?
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Old 30th July 2005, 01:18 PM   #9
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Default MJE13005 Datasheet

try this datasheet from OnSemi. A little better picture here:


http://www.onsemi.com/pub/Collateral/MJE13005-D.PDF

Best regards,

Steve
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Old 31st July 2005, 12:02 AM   #10
djk is offline djk
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For a switching transistor the MJE13005 has good SOA up to 50V or so. It is intended for 220V off line switching where it can control a couple of hundred watts.

The Beta drops like a rock above 1A, not something I would use.

An MJ15015 is used in the Carver M400T and the Crown Power Base 1, both 200W amplifiers. I pay USD$1.23 for mine. 180W SOA at 60V with good Beta out to 5A, 120V CE ratings.
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