Bash Amp Power Supply Repair

crazifunguy · 11:29 AM

I have a couple Bash subwoofer amps that I would like to get up and running. They both seem to have failed from the typical problems associated with the SMPS power supplies. I have replaced the FET's and anything else burnt, but I have hit a wall. On the power input side what seems to be an inrush current limiting thermistor has failed and I cannot identify the component. The markings are DSP 104. Also the PDC board has what looks to be a failed diode. Unfortunatley the silkscreen is double marked so I cannot determine the proper direction. The diode is d11 in the upper right corner. It can be seen burned and black. Please have a look at the pictures.

! · 10th July 2011, 06:57 PM

Thermistor is 10 ohm (@ 25C temperature), 4 amp type. Substitute equivalent value.

part # example from original 13DSP-104
Diing Tai Electronics Co. Ltd

As for the "diode" with dual polarity markings on the PCB, I can only guess it is a DIAC based on this forum topic:
Klipsch Promedia BASH amplifier

crazifunguy · 10th July 2011, 07:52 PM

WOW Thank You for the fast reply. I searched and searched and posted on a few different forums about the DSP 104 and was coming up empty. Also in my years of playing with electronics I have never heard of a diac. Learn something new all the time. That would explain why when I used a diode the SMPS would not osciliate. When I replace the parts I will post updates and hopefully the amp will be alive!!

crazifunguy · 22nd August 2011, 07:18 AM

I have decided to redesign this power supply here is my latest PCB

CarlosRivera · 26th April 2012, 03:09 PM

can someone provide where to source Diing Tai Electronics Co. Ltd 13DSP 104 thermistor? our usual supplifiers do not carry this product. Equivalents acceptable. Further, what is the Root Cause (RCA) of this failure. we have seen this in many not only consumer self powered subs, but also with commercial self powered subs?

10th July 2011, 11:26 AM	#1
crazifunguy diyAudio Member Join Date: Aug 2008	Bash Amp Power Supply Repair I have a couple Bash subwoofer amps that I would like to get up and running. They both seem to have failed from the typical problems associated with the SMPS power supplies. I have replaced the FET's and anything else burnt, but I have hit a wall. On the power input side what seems to be an inrush current limiting thermistor has failed and I cannot identify the component. The markings are DSP 104. Also the PDC board has what looks to be a failed diode. Unfortunatley the silkscreen is double marked so I cannot determine the proper direction. The diode is d11 in the upper right corner. It can be seen burned and black. Please have a look at the pictures. Last edited by crazifunguy; 10th July 2011 at 11:29 AM.

26th April 2012, 03:09 PM	#5
CarlosRivera diyAudio Member Join Date: Apr 2012	Bash Amp Power Supply repair can someone provide where to source Diing Tai Electronics Co. Ltd 13DSP 104 thermistor? our usual supplifiers do not carry this product. Equivalents acceptable. Further, what is the Root Cause (RCA) of this failure. we have seen this in many not only consumer self powered subs, but also with commercial self powered subs?

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10th July 2011, 06:57 PM	#2
! diyAudio Member Join Date: Jun 2005 Location: Midwest	Thermistor is 10 ohm (@ 25C temperature), 4 amp type. Substitute equivalent value. part # example from original 13DSP-104 Diing Tai Electronics Co. Ltd As for the "diode" with dual polarity markings on the PCB, I can only guess it is a DIAC based on this forum topic: Klipsch Promedia BASH amplifier

10th July 2011, 07:52 PM	#3
crazifunguy diyAudio Member Join Date: Aug 2008	WOW Thank You for the fast reply. I searched and searched and posted on a few different forums about the DSP 104 and was coming up empty. Also in my years of playing with electronics I have never heard of a diac. Learn something new all the time. That would explain why when I used a diode the SMPS would not osciliate. When I replace the parts I will post updates and hopefully the amp will be alive!!

22nd August 2011, 07:18 AM	#4
crazifunguy diyAudio Member Join Date: Aug 2008	I have decided to redesign this power supply here is my latest PCB

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