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Old 20th January 2006, 09:05 AM   #1
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Default Need help building a amp

Hello I am new to this and have never build a amp. I have four transistors made by texas instruments the number on them is 417-298 7330 they came out of a old radio that was rated at 100watts so I am guessing they are good for 25watts each. What I am needing is a diagram of a amp to use these in. Can anyone help me?
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Old 20th January 2006, 10:22 AM   #2
djk is online now djk
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Throw them away.

Modern transistors are much better, and cost very little. The main cost of an amp is in the chassis, heatsink, and power supply.

In the end, the cost of the transistors is almost incidental.
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Old 20th January 2006, 11:51 AM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
I'm inclined to agree with Djk.

Chassis 40%, PSU 30%, heatsinks, amplifier and hardware each 10%.
These proportions are very approximate and buying expensive components secondhand or from surplus can make some very big savings.
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Old 20th January 2006, 04:35 PM   #4
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Thank you for the information. Maybe this will help me more. I also have the transformer out of that radio it is 110v in and it puts out 18v on two differnt wires can I use it for anything?
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Old 21st January 2006, 03:37 AM   #5
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I would like to build the zeta 1 amp. Does anyone know where I can find a parts list for this amp?
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Old 21st January 2006, 06:32 AM   #6
djk is online now djk
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"zeta 1 amp"

If you're meaning the amp by Lars Clausen, it's not something I would recommend for a first time project.
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Old 6th February 2006, 08:02 AM   #7
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Just finished my frist chipamp from chipamp.com. It was very easy, and it is one very awsome sounding amp. I used on old broken vcr for the case and a heatsink from an old 600mhz amd athlon computer. I also used two trans. from old stereos they ran at 36v out on each one had 54v after the rectifer. I let it run for 24 hours and it never got hot. Oh I am also running a fan on the heatsink. Next I think I will build the BPA-200.
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Old 6th February 2006, 08:49 AM   #8
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Does anyone have any info on the zen lite amp?
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