Help?

elrocco · 16th February 2007, 08:03 AM

i need help understanding this schematic
http://europa.spaceports.com/~fishbake/amp/a100.jpg

im kinda new to electronics, i usually build simple stuff but this kinda is over my head can anyone help me out?
I think i can do this if I had a list of part's... thats the main problem i had.

raromachine · 16th February 2007, 08:12 AM

Help is a pretty vague title for a post

The parts are actually written on the image - TIP41, 142 and 147 are transistors as are the 2x 2a258. You'll probably want some BIT heatsinks for those transistors.

You've got 2x 1n4007 diodes.

A hand full of resistors of differing wattage ratings and a few caps.

And a +45v and -45v feed (which would be rectified from a transformer with 32VAC secondaries).

AndrewT · 16th February 2007, 06:14 PM

Hi,
I would say forget it.

If you want an intro to power amps then download some of BrianGT (or similar) chipamp schematics. Then build from there.

CarlosT · 17th February 2007, 12:52 AM

I like that..."this was handed down from a friendof a friend"

I gotta go with AndrewT on this one...any good chipamp kit will prolly be much more rewarding and you'll learn a lot more.

elrocco · 17th February 2007, 06:40 AM

Thanks for the help, but I really didn't make much sense. I meant what are equivalents to the TIP 142, 157, and 41 as I cannot find these components at any radio shack or hobbies store.

raromachine · 17th February 2007, 09:15 AM

Digikey seems to list them

But as the other posters have said - there are probably more modern and just as simple amps available.

elrocco · 17th February 2007, 07:33 PM

Ok, what would be a good place to find a schematic for one of them?

AndrewT · 17th February 2007, 08:00 PM

Hi,
I just did a search in chipamps for schematic and it came back with over 1300 threads.
If only 10% have a schematic posted then you have a choice of 130 schematics to choose from.

elrocco · 17th February 2007, 08:18 PM

ok thanks, all I'm looking for is a 12 volt chipamp schematic?

16th February 2007, 08:03 AM	#1
elrocco diyAudio Member Join Date: Feb 2007 Location: victorville, ca	Help? i need help understanding this schematic http://europa.spaceports.com/~fishbake/amp/a100.jpg im kinda new to electronics, i usually build simple stuff but this kinda is over my head can anyone help me out? I think i can do this if I had a list of part's... thats the main problem i had.

16th February 2007, 06:14 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I would say forget it. If you want an intro to power amps then download some of BrianGT (or similar) chipamp schematics. Then build from there. __________________ regards Andrew T.

17th February 2007, 08:00 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I just did a search in chipamps for schematic and it came back with over 1300 threads. If only 10% have a schematic posted then you have a choice of 130 schematics to choose from. __________________ regards Andrew T.

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16th February 2007, 08:12 AM	#2
raromachine diyAudio Member Join Date: Jun 2006	Help is a pretty vague title for a post The parts are actually written on the image - TIP41, 142 and 147 are transistors as are the 2x 2a258. You'll probably want some BIT heatsinks for those transistors. You've got 2x 1n4007 diodes. A hand full of resistors of differing wattage ratings and a few caps. And a +45v and -45v feed (which would be rectified from a transformer with 32VAC secondaries).

17th February 2007, 12:52 AM	#4
CarlosT diyAudio Member Join Date: Oct 2006	I like that..."this was handed down from a friendof a friend" I gotta go with AndrewT on this one...any good chipamp kit will prolly be much more rewarding and you'll learn a lot more.

17th February 2007, 06:40 AM	#5
elrocco diyAudio Member Join Date: Feb 2007 Location: victorville, ca	Thanks for the help, but I really didn't make much sense. I meant what are equivalents to the TIP 142, 157, and 41 as I cannot find these components at any radio shack or hobbies store.

17th February 2007, 09:15 AM	#6
raromachine diyAudio Member Join Date: Jun 2006	Digikey seems to list them But as the other posters have said - there are probably more modern and just as simple amps available.

17th February 2007, 07:33 PM	#7
elrocco diyAudio Member Join Date: Feb 2007 Location: victorville, ca	Ok, what would be a good place to find a schematic for one of them?

17th February 2007, 08:18 PM	#9
elrocco diyAudio Member Join Date: Feb 2007 Location: victorville, ca	ok thanks, all I'm looking for is a 12 volt chipamp schematic?

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