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kedwardsleisure View Drop Down
Old Croc
Old Croc


Joined: 20 January 2009
Location: Staffordshire
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Points: 4811 		Direct Link To This Post Posted: 12 October 2010 at 8:24pm
Quote using a pair of National LM3886 chip amps


These are the ones that are fitted to almost every chinese powered PA speaker to grace our fair isle. The legs of the chips suffer metal fatigue and then go DC, frying the drivers Whoever They May Be.

Kevin

North Staffordshire
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andyamp View Drop Down
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Joined: 21 July 2007
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Points: 2115 		Direct Link To This Post Posted: 12 October 2010 at 8:41pm
first rule of amplifier design.
do not use chip amps
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/
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mystyca View Drop Down
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Joined: 19 August 2010
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Points: 158 		Direct Link To This Post Posted: 12 October 2010 at 8:42pm
NAD 3140 c.1983
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MunkeyQ View Drop Down
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Beware,Scammer.

Joined: 23 May 2009
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Points: 449 		Direct Link To This Post Posted: 12 October 2010 at 9:00pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

Quote using a pair of National LM3886 chip amps


These are the ones that are fitted to almost every chinese powered PA speaker to grace our fair isle. The legs of the chips suffer metal fatigue and then go DC, frying the drivers Whoever They May Be.


Carlsbro's cheapo powered wedges use them too unfortunately - the 8" + piezo jobbies where the amp is in one, and the other is passive and simply daisy-chains on the output. Worked on a couple with failed chips...probably the result of driving a 4 ohm load at full whack for hours on end.
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mystyca View Drop Down
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Points: 158 		Direct Link To This Post Posted: 12 October 2010 at 9:01pm
cambridge audio p70
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chris_k View Drop Down
Young Croc
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Joined: 14 April 2005
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Points: 1256 		Direct Link To This Post Posted: 12 October 2010 at 9:18pm
Originally posted by andyamp andyamp wrote:

my hifi amp is ITL


One of your older designs was it not?
My dad has an ITL the one with the seperate power amplifier. Its MA something? Bought in the late 80`s i think, sounds nice.
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Muckerbarnes1 View Drop Down
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Joined: 20 March 2010
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Points: 2654 		Direct Link To This Post Posted: 13 October 2010 at 1:07am
Originally posted by Wikl109 Wikl109 wrote:

Here are some internal pics of an old TSR-150x amp. As far as I know Bass retail used to use a lot of these for background music systems and jukeboxes. I'm not sure who the OEM for these was but the internals are pretty neatly laid out. Not exactly a powerhouse but still thought the pics were worth a look:



Bass Had their own engineers who designed and fitted such. One was a good friend of mine. Sadly he is not on here. otherwise the 'real' story would be told. He is now a director of Julianas Leisure Services
Billy Dawg.
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nineleaves View Drop Down
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Joined: 31 August 2007
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Points: 1327 		Direct Link To This Post Posted: 13 October 2010 at 2:52am
cambridge audio - "designed with care and attention" slapped on that board ...so they copyed the reference design out of the phillips pdf then ? ...must of been getting somewhat self consious about that ..lol.

Edited by nineleaves - 13 October 2010 at 2:54am
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mystyca View Drop Down
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Points: 158 		Direct Link To This Post Posted: 13 October 2010 at 10:22am
LOL
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Tony Wilkes View Drop Down
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Joined: 02 August 2004
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Points: 4840 		Direct Link To This Post Posted: 13 October 2010 at 10:40am
So its all right to take the piss out of Chinese manufactured gear then as long as we don't own any? Thank the lord my DCX was designed and built in Germany, Err
www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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MunkeyQ View Drop Down
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Joined: 23 May 2009
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Points: 449 		Direct Link To This Post Posted: 13 October 2010 at 12:16pm
I'll post some pro audio stuff soon, honest...


Here's a little 15wpc Yamaha receiver, circa 1979 or so. 2 output devices per channel, separate transformer windings for pre and power stages and an Alps pot. The PCB tracks are silkscreened and labelled on top of the board, which is a nice touch for techs. Sounds very, very nice as long as you don't hook up inefficient speakers and crank it to 11. Quality Jap gear! It's currently doing bedroom duty at my mother's, hooked to a pair of efficient Fostex FE-103 fullrange transmission lines and a cheapo powered bandpass sub.
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mystyca View Drop Down
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Points: 158 		Direct Link To This Post Posted: 13 October 2010 at 1:37pm
Originally posted by nineleaves nineleaves wrote:

Indeed, some of the chips arent half bad ..but still, packaging it like some 'sophisticated' hifi amp is a little cheeky LOL


I thought it was going to be a proper Hi-Fi amp with Transistors and everything, for some unknown reason to me decided to lift the lid and found two of the smallest output chips I ever saw, my jaw fell through the floor, They sneakily used a heavy case to give the feel of a proper heavy Hi-Fi amp, but there's nothing in the box, kind of like buying a bag of Walkers Crisps, the weight states '28 g' open the bag and there's 1/8th of a potato in the bag
DJ
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