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- From: pandey+@cs.cmu.edu (Manish Pandey)
- Subject: Need help to build an Audio Amplifier
- Message-ID: <BuG1zz.FzJ.1@cs.cmu.edu>
- Sender: news@cs.cmu.edu (Usenet News System)
- Nntp-Posting-Host: n3.sp.cs.cmu.edu
- Organization: School of Computer Science, Carnegie Mellon
- Date: Sat, 12 Sep 1992 02:38:23 GMT
- Lines: 55
-
-
- I am interested in constructing an audio amplifier and I need some
- help from fellow-netters who may have some experience building one.
-
- My specifications include the following:
-
- 1. Output power: Moderate : anywhere from 35W to 100W.
- 2. Low distortion: 0.01% (Typical)
- 3. Simplicity of construction.
- I am considering using a separate amplifier for each audio
- driver. ( So that there are no high level crossover networks)
-
- Also I have power supplies which give me +-27 Volts at 10Amps.
-
- Among the options I am exploring are the following
-
- 1. Using LM12, the power OP AMP manufactured by National Semiconductor.
- It can deliver upto 150 W of power ( of course limited by pwr supplies)
-
- Advantage: Excellent performance, extremely simple
- Disadvantages: It seems a little bit pricey at $35 for each
- chip and I will probably need 6-8 of these.
-
-
- 2. Using TDA1514 manufactured by signetics.
- Powerout Max = 40W into 8ohms.
-
-
- Advantage: Excellent performance (low noise, distortion 0.01% typ)
- Cheap $4.50/chip + a few more support components.
-
- Disadvantage: The only distributor I know of ( Marshall Industries )
- sells a minimum of 45. I could stockup to maybe 10-15
- of these but 45 seems a lot of waste.
-
- So, my questions are the following:
-
- Q1 Has anyone used LM12 / TDA1514 to build audio amps ?
- what has been their experience ?
-
- Q2 Do people have any suggestions as to other commercially
- available chips which match the ones mentioned in Q1?
-
- Q3 Are there any Signetics distributors which sell in small
- quantities?
-
- Q4 Is anybody interested in group purchase of the TDA 1514 ?
-
-
- Thanks a lot for your help. I will post a summary of the responses
- I get.
-
-
- Manish Pandey
-
-