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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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What size amp would I need?
I asked before about a monaural amp for my bathroom TV, to use my
cetiling/wall speakers from a 30's record player. I hadn't been able to find a small amp, under 50 dollars on ebay or Amazon and that's why I asked here. Amazingly, then I found several in some other list (I'll try tell you later when I find it again.) Now I'm ready to buy one but my question is, What size amp would I need? They ran from 5 watts to 14 watts and more. (The input will come from he earphone jack on the TV.) And I presume I can take a stereo amp and connect the sides in parallel, if I keep polarity the same???? I have a 10" speaker and a 4 or 6" speaker, that I removed from 1930's record player, mounted to a suitable piece of chip board, covered with grill cloth (well, tan-colored burlap that a roommate had once used to cover the walls in his room) , and held to the wall and ceiling with hand-made molding. (not as fancy as it sounds.) I"m using the original crossover device (a single capacitor iirc. ) It gives a very nice sound. . (It's been 30 years since I nailed all this to the wall, so I don't remember some details. Thanks again. |
#2
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What size amp would I need?
I asked before about a monaural amp for my bathroom TV, to use my
cetiling/wall speakers from a 30's record player. I hadn't been able to find a small amp, under 50 dollars on ebay or Amazon and that's why I asked here. Amazingly, then I found several in some other list (I'll try tell you later when I find it again.) Now I'm ready to buy one but my question is, What size amp would I need? They ran from 5 watts to 14 watts and more. (The input will come from he earphone jack on the TV.) Beware of power ratings... or, at least, know what you're getting based on how the power rating is given. It's been common for years to find amps and receivers marketed with extremely unrealistic power ratings... the classic example being the kind of amp which advertises "100 watts peak music power" but is driven from a wall-wart that might deliver 5 watts for a few seconds before overheating. And I presume I can take a stereo amp and connect the sides in parallel, if I keep polarity the same???? That's a good recipe for a fried amplifier, in many cases. Any mismatch between the two amplifier sides, *or* between the signals fed into the two channels will result in the two sections fighting with one another... one trying to pull the output voltage up, the other trying just as hard to pull it down. Each side will look like a dead short, or worse, to the other. All it takes is one glitch, and all of the Magic Blue Smoke leaks out. Unless an amp is specifically designed and advertised as being able to handle this sort of parallel configuration, don't do it. That being said... it's hard to give you a good answer to your question without knowing much more about the speakers you are planning to use, any enclosures, the volume level you want to run, the sort of program material you want to play, etc. As a general rule of thumb, I'd guess that an honest 10-watt amplifier would likely give you as much volume as you'd want in this sort of application, unless your existing wall/ceiling speakers are extremely inefficient. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
#3
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What size amp would I need?
A true 5W -- that is, the amp can produce a continuous average power of 5W at
low distortion -- should be more than enough. I have large planar speakers, and you be amazed at how little power they need to play relatively loudly -- just a few watts. |
#4
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What size amp would I need?
micky wrote:
I asked before about a monaural amp for my bathroom TV, to use my cetiling/wall speakers from a 30's record player. I hadn't been able to find a small amp, under 50 dollars on ebay or Amazon and that's why I asked here. Amazingly, then I found several in some other list (I'll try tell you later when I find it again.) Now I'm ready to buy one but my question is, What size amp would I need? They ran from 5 watts to 14 watts and more. (The input will come from he earphone jack on the TV.) And I presume I can take a stereo amp and connect the sides in parallel, if I keep polarity the same???? I have a 10" speaker and a 4 or 6" speaker, that I removed from 1930's record player, mounted to a suitable piece of chip board, covered with grill cloth (well, tan-colored burlap that a roommate had once used to cover the walls in his room) , and held to the wall and ceiling with hand-made molding. (not as fancy as it sounds.) I"m using the original crossover device (a single capacitor iirc. ) It gives a very nice sound. . (It's been 30 years since I nailed all this to the wall, so I don't remember some details. Thanks again. http://www.ebay.com/itm/Optimus-SA-1...item2c6bef95cc Greg |
#5
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What size amp would I need?
gregz wrote:
micky wrote: I asked before about a monaural amp for my bathroom TV, to use my cetiling/wall speakers from a 30's record player. I hadn't been able to find a small amp, under 50 dollars on ebay or Amazon and that's why I asked here. Amazingly, then I found several in some other list (I'll try tell you later when I find it again.) Now I'm ready to buy one but my question is, What size amp would I need? They ran from 5 watts to 14 watts and more. (The input will come from he earphone jack on the TV.) And I presume I can take a stereo amp and connect the sides in parallel, if I keep polarity the same???? I have a 10" speaker and a 4 or 6" speaker, that I removed from 1930's record player, mounted to a suitable piece of chip board, covered with grill cloth (well, tan-colored burlap that a roommate had once used to cover the walls in his room) , and held to the wall and ceiling with hand-made molding. (not as fancy as it sounds.) I"m using the original crossover device (a single capacitor iirc. ) It gives a very nice sound. . (It's been 30 years since I nailed all this to the wall, so I don't remember some details. Thanks again. http://www.ebay.com/itm/Optimus-SA-1...item2c6bef95cc Greg http://www.ebay.com/itm/RADIO-SHACK-...item589b59149c Greg |
#6
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What size amp would I need?
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#7
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What size amp would I need?
On Fri, 1 Feb 2013 02:22:06 +0000 (UTC), gregz
wrote: gregz wrote: micky wrote: I asked before about a monaural amp for my bathroom TV, to use my cetiling/wall speakers from a 30's record player. I hadn't been able to find a small amp, under 50 dollars on ebay or Amazon and that's why I asked here. Amazingly, then I found several in some other list (I'll try tell you later when I find it again.) Now I'm ready to buy one but my question is, What size amp would I need? They ran from 5 watts to 14 watts and more. (The input will come from he earphone jack on the TV.) And I presume I can take a stereo amp and connect the sides in parallel, if I keep polarity the same???? I have a 10" speaker and a 4 or 6" speaker, that I removed from 1930's record player, mounted to a suitable piece of chip board, covered with grill cloth (well, tan-colored burlap that a roommate had once used to cover the walls in his room) , and held to the wall and ceiling with hand-made molding. (not as fancy as it sounds.) I"m using the original crossover device (a single capacitor iirc. ) It gives a very nice sound. . (It's been 30 years since I nailed all this to the wall, so I don't remember some details. Thanks again. http://www.ebay.com/itm/Optimus-SA-1...item2c6bef95cc Greg http://www.ebay.com/itm/RADIO-SHACK-...item589b59149c Greg Thanks for the link and he extra effort to find the second link . The first one sold last night for $10 plus 26S&H. The second one was cheaper and I'm thinking about it. It will do the job, I'm sure. And thanks William. |
#8
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What size amp would I need?
On Thu, 31 Jan 2013 17:41:49 -0500, micky
wrote: I asked before about a monaural amp for my bathroom TV, to use my cetiling/wall speakers from a 30's record player. I hadn't been able to find a small amp, under 50 dollars on ebay or Amazon and that's why I asked here. Amazingly, then I found several in some other list (I'll try tell you later when I find it again.) ...... Thanks again. I learned a lot from this thread. Gregz, I think yours would have worked well, but it was too small to sit under the tv, and took up too much needed space on top of the tv. (I have a radio and I forgot to mention, most of the time I have a wireless remote speaker from the compute( for Pandora; NPR podcasts, AOL radio (which no longer has a 50's or do-wop genre) etc.) The other list I refer to I found again it and was Google Shopping, where I had used "small amplifier". The word small made a big difference. But when I went back to ebay, "small " made no difference, and with Amazon, it made things worse. It showed things but none that I wanted, none that were in google shopping. So finally I found a use for Google Shopping. It had several suitable but I ended up getting http://www.mcmelectronics.com/product/28-6400 Provides 3.5W RMS output into a 4ohm load If somewho it doesn't work, I'll get http://www.mcmelectronics.com/produc...-M032-/28-6402 Provides 12W RMS output into a 4ohm load Otherwise they are very similar. They both have line-in inputs. (And I've bought from MCM i the past, before the web event. ) I had looked at my TV and it looked like it had stereo speakers, so I dl'd the manual to be sure, and the 24" inch version does have stereo but in the 13 inch version it's monaural, and it says 1Watt and 1 speaker. I should have done this in the first place, I guess, but I didnt' think of it. So 3.5 watts should be more than what's there now. The manual was useful for other reasons. For example, the tv has a setting where the speakers are off but the volume control controls the sound coming out of the RCA jack(s) in the back. |
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