Dei 2101 amp

mike49504 · 28th July 2010, 07:17 PM

This amp has a blown power supply . The fets they are using are NDP508AEL.

Is there a good cross for theese??

They are using 100 ohm gate resistors.

Perry Babin · 28th July 2010, 07:43 PM

It's strange to see 80v FETs in the supply. Are they the original parts?

If the amp uses a typical drive circuit, the IRFZ44 should be a good sub.

mike49504 · 29th July 2010, 02:38 AM

Thet appear to be orginal. I put the irfz44's in. Not sure whats up with it now but the amp is drawing around 20 amps of current at idle

Perry Babin · 29th July 2010, 02:41 AM

Have you checked the driver transistors?

Can you post a photo of the power supply area of the board?

mike49504 · 30th July 2010, 12:37 AM

Heres some pics of the board.

Perry Babin · 30th July 2010, 08:26 PM

Have you checked the driver transistors?

Is that a bad capacitor near the power supply board?

While it's drawing excess current, what is the DC voltage across the emitter/source resistors?

mike49504 · 2nd August 2010, 05:04 PM

The driver transistors are shorted in this amp.

They are marked 2L is there a goog sub for theese??

Perry Babin · 2nd August 2010, 05:21 PM

The 2L is a high voltage transistor. If this is for the power supply, the MMBTA56 will be a good sub. If this is for the audio section, you'll likely have to use the exact replacement (MMBT5401).

mike49504 · 2nd August 2010, 06:08 PM

I have the following transistors on hand.

1A
2A
2T
2X

will any of thoose work cant remember what they are?

if not whats the mmbta56 markings?

Perry Babin · 2nd August 2010, 08:09 PM

Use the 2T.

The SMD Code Book

28th July 2010, 07:17 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Dei 2101 amp This amp has a blown power supply . The fets they are using are NDP508AEL. Is there a good cross for theese?? They are using 100 ohm gate resistors.

28th July 2010, 07:43 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's strange to see 80v FETs in the supply. Are they the original parts? If the amp uses a typical drive circuit, the IRFZ44 should be a good sub. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th July 2010, 02:41 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Have you checked the driver transistors? Can you post a photo of the power supply area of the board? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

30th July 2010, 08:26 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Have you checked the driver transistors? Is that a bad capacitor near the power supply board? While it's drawing excess current, what is the DC voltage across the emitter/source resistors? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd August 2010, 05:21 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 2L is a high voltage transistor. If this is for the power supply, the MMBTA56 will be a good sub. If this is for the audio section, you'll likely have to use the exact replacement (MMBT5401). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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29th July 2010, 02:38 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Thet appear to be orginal. I put the irfz44's in. Not sure whats up with it now but the amp is drawing around 20 amps of current at idle

2nd August 2010, 05:04 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	The driver transistors are shorted in this amp. They are marked 2L is there a goog sub for theese??

2nd August 2010, 06:08 PM	#9
mike49504 diyAudio Member Join Date: Sep 2006	I have the following transistors on hand. 1A 2A 2T 2X will any of thoose work cant remember what they are? if not whats the mmbta56 markings?

2nd August 2010, 08:09 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Use the 2T. The SMD Code Book __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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