Best driver for MJ15024/25 motorola transistor - diyAudio
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Old 30th June 2005, 07:32 AM   #1
aht is offline aht  Thailand
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Question Best driver for MJ15024/25 motorola transistor

Now I designed Balanced Power Amplifier which use power tr MJ15024/25 for 75WRMS/CH with power supply rals +/- 51V

I had use 2N5415/3440 but now they're out of production. My friend suggest me you can use motolora MJE15030/31 instead of them but I like soud and spec of 2SD669/2SB649

So how can I use both of them or some people suggest me another number of driver

Regard
AHT
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Old 30th June 2005, 07:37 AM   #2
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Why not use the Motorola drivers MJE15032/33 or their newer counterparts (which are even better) MJE15034/35?
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Old 30th June 2005, 10:36 AM   #3
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Default Re: Best driver for MJ15024/25 motorola transistor

Quote:
Originally posted by aht

I had use 2N5415/3440 but now they're out of production. My friend suggest me you can use motolora MJE15030/31 instead of them but I like soud and spec of 2SD669/2SB649

Hi Aht,

It seems that the pair 2SD669/2SB649 is out of production too. It has very good specs, I agree with you. I was constructing an Amp that was supposed to use them. Instead, I've used the pair KSA1220/KSC2690 from Fairchild which is easy to find and has very close specs. The amp is sounding very good.

Besides that, I agree with richieboy, On/Motorola offers a variety of driver transistors which you could use.

Best regards,

Joćo Pedro
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Old 30th June 2005, 01:33 PM   #4
aht is offline aht  Thailand
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Default This's my schematic.

I used 15030/31 already but they're required more current than 2N5415/2N3440.

Both sound of RCA & XLR are nearest and close to Audio Analogue Puccini Se Remote in lowcost

I think it's can be modify to integated amplifier by use passive volume control.

Now it's need some modify to ZERO NFB for possible.

I study from Japan's website they're have sevaral method to modify normal amplifier (NFB amplifier) to the zero NFB amplifier.

If anybody want some pcb design (protel & pdf) can be mail to me for make a little project 75WRMS BALANCED AMPLIFIER.

I hope you'll like this project

Regard
AHT
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Old 30th June 2005, 05:27 PM   #5
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Thumbs up Protel file for create PCB

Everybody can download protel file from this topic.
Let's build your own

Regard
AHT
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Old 1st July 2005, 03:03 AM   #6
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Hi AHT,

You have strange perspectives.

There are indeed many ways to degrade audio performance. Using low grade or inherently flawed parts is one, removing NFB is another! If you want to go down this path and listen to the raw distortion of OL amplifiers, fine. But to suggest others may want to follow the path is questionable?

I recall coming to your country to correct such misconceptions and the result - they won a "golden ear" . Is there something in the Phrao Chaya drinking water?

Cheers,
Greg
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Old 1st July 2005, 03:35 AM   #7
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Default pls try to use from TOSHIBA

pls try to use from TOSHIBA

2SA1360,2SC3423 150V 50mA 200Mhz
and anather one
2sa1358,2sc3421 120V 1A 120Mhz
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Old 1st July 2005, 03:40 AM   #8
aht is offline aht  Thailand
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Question Why not ?

There're many ways to use zero nfb for improve performance of amplifier.

My project still use nfb but I want to modify or change some stage for testing with my (or somebody which downloaded file) experience.

amplifierguru , I like your concept and heard your suggestion amplifier (golden ear) but I want to make something different. Do you have any idea for non nfb ?

Sometime I think non nfb is misconcept but I want to make case study for my life

I have some link and some pictures from Japan website.

http://homepage3.nifty.com/ebina2540...in_mini.html#i

Regard
AHT
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Old 1st July 2005, 04:08 AM   #9
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Hi AHT,

I love that buddhist psyche - it shows in your responses. You are so accepting - even of flawed concepts and at the same time too lacking in 'confidence' to offer something new (another current eclectic thread).

I think the indoctrination of a flawed concept that NFB is bad so should be dispensed with is everpresent in your country. You accept such flawed concepts too easily. NFB is a rock.

Cheers,
Greg
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Old 1st July 2005, 06:01 AM   #10
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Quote:
Originally posted by amplifierguru

NFB is a rock.

Greg

No Greg, its SOLIDSTATE METAL ROCK


Kanwar
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