Need Some Help (Home Project)

Brain Fried · 12:32 AM

OK my son came to me last week and ask me to build him a car audio amp so i told him i will try to do my best. I have a good idea but i am not sure on some of the parts on the schematic i have a clear idea i know some of them are capacitors but i want to be 100% sure here a picture of the schematic the areas highlighted in yellow are the parts i am not sure what they are. I will appreciate any help you guys give to help complete this for my son.

Perry Babin · 22nd April 2010, 12:49 AM

Those are capacitors but if you haven't purchased the IC yet, you may want to use something like the 3886 which requires fewer external components.
LM3886 - High-Performance 68W Audio Power Amplifier with Mute

You could also try posting this on the chip-amp forum if you want other suggestions.

Brain Fried · 22nd April 2010, 01:01 AM

Quote:

Originally Posted by Perry Babin

Those are capacitors but if you haven't purchased the IC yet, you may want to use something like the 3886 which requires fewer external components.
LM3886 - High-Performance 68W Audio Power Amplifier with Mute

You could also try posting this on the chip-amp forum if you want other suggestions.

I already ordered them

so those are capacitors so i was on the right track my next Q is there are two that are marked 33p & 47p what are they?

Perry Babin · 22nd April 2010, 01:31 AM

33 and 47 picofarad would be my guess.

What are you going to power it with?

Brain Fried · 22nd April 2010, 01:42 AM

Quote:

Originally Posted by Perry Babin

What are you going to power it with?

i have the power supply out of a totaled 800a2 do you think it will be enough?

Perry Babin · 22nd April 2010, 02:04 AM

Yeah... I think it will be enough.

Brain Fried · 22nd April 2010, 02:24 AM

Perry how does this one look. it looks a lot more simple to me.

Perry Babin · 22nd April 2010, 02:42 AM

It still has a lot of external parts.

I don't mind trying to help you with this but the guys in the chip-amp forum have a lot of experience and can provide more reliable information. Tell them what you want from the amp and that you have a power supply that produces ~±60v (which can be modified to produce slightly more or less voltage). They may be able to tell you the best chip to use that has a minimum of external parts.

When you build this, you will probably have engine noise. You may have to use a ground loop isolator to get rid of it.

Brain Fried · 24th April 2010, 01:21 AM

Perry got a quick question on the 800a2 power supply. I know the rockford power supply is 50v +/- and for what i and doing i need 60V +/- so i am thinking of the power mosfets from the MTP75N05HD to NTP75N06 Tell me what you think here is the datasheets for both of them.
MTP75N05HD pdf, MTP75N05HD description, MTP75N05HD datasheets, MTP75N05HD view ::: ALLDATASHEET :::

http://www.datasheetcatalog.org/data...NTP75N06-D.PDF

Perry Babin · 24th April 2010, 01:24 AM

Those don't affect the rail voltage.

Have you measured the rail voltage? I think it's likely to be closer to ±58v.

22nd April 2010, 12:26 AM	#1
Brain Fried diyAudio Member Join Date: Apr 2010	Need Some Help (Home Project) OK my son came to me last week and ask me to build him a car audio amp so i told him i will try to do my best. I have a good idea but i am not sure on some of the parts on the schematic i have a clear idea i know some of them are capacitors but i want to be 100% sure here a picture of the schematic the areas highlighted in yellow are the parts i am not sure what they are. I will appreciate any help you guys give to help complete this for my son. Last edited by Brain Fried; 22nd April 2010 at 12:32 AM.

22nd April 2010, 12:49 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Those are capacitors but if you haven't purchased the IC yet, you may want to use something like the 3886 which requires fewer external components. LM3886 - High-Performance 68W Audio Power Amplifier with Mute You could also try posting this on the chip-amp forum if you want other suggestions. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd April 2010, 01:31 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	33 and 47 picofarad would be my guess. What are you going to power it with? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd April 2010, 02:04 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yeah... I think it will be enough. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd April 2010, 02:42 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It still has a lot of external parts. I don't mind trying to help you with this but the guys in the chip-amp forum have a lot of experience and can provide more reliable information. Tell them what you want from the amp and that you have a power supply that produces ~±60v (which can be modified to produce slightly more or less voltage). They may be able to tell you the best chip to use that has a minimum of external parts. When you build this, you will probably have engine noise. You may have to use a ground loop isolator to get rid of it. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

22nd April 2010, 02:24 AM	#7
Brain Fried diyAudio Member Join Date: Apr 2010	Perry how does this one look. it looks a lot more simple to me.

24th April 2010, 01:21 AM	#9
Brain Fried diyAudio Member Join Date: Apr 2010	Perry got a quick question on the 800a2 power supply. I know the rockford power supply is 50v +/- and for what i and doing i need 60V +/- so i am thinking of the power mosfets from the MTP75N05HD to NTP75N06 Tell me what you think here is the datasheets for both of them. MTP75N05HD pdf, MTP75N05HD description, MTP75N05HD datasheets, MTP75N05HD view ::: ALLDATASHEET ::: http://www.datasheetcatalog.org/data...NTP75N06-D.PDF

24th April 2010, 01:24 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Those don't affect the rail voltage. Have you measured the rail voltage? I think it's likely to be closer to ±58v. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Custom Home Theater Project in New Home, Opinions appreciated.	thadman	Multi-Way	5	20th November 2008 12:40 AM
Home Theater Sub Project	Focus	Subwoofers	9	21st April 2006 07:30 PM
First home DIY project - need guidance	Lusso5	Multi-Way	9	19th December 2003 12:28 PM
First home speaker project, need measurements.	HiggityHank	Multi-Way	7	4th December 2003 02:18 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read