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Chip Amps Amplifiers based on integrated circuits

LM3886 opinions sought
LM3886 opinions sought
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Old 7th January 2018, 04:57 PM   #1
john blackburn is offline john blackburn  United Kingdom
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Default LM3886 opinions sought

I have two 25v 225va transformers and two psu boards kicking around from a previous project that I want to do something with.

I intend to use LM3886 chips on a fairly low budget, so most likely a point to point jobbie. As I see it I have three options, a stereo build using one transformer and psu, dual mono using both or a monoblock sat by each speaker.

I know it is overkill to use 225va for a single chip, but since I've got them and I have never heard monoblocks I am leaning that way a bit. I have a Pass diy B1 here so the longer interconnects should be no problem.

Chassis costs aside what do you think? I know I'm not going to get data sheet performance with p2p, it's more about getting some use from what is currently an expensive paper weight (and using up some bits from the biscuit tins).



John
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Old 7th January 2018, 05:11 PM   #2
adason is offline adason  United States
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I have done point to point in the air lm3886 chips, no problems, go for it. Great sound.
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Old 7th January 2018, 05:45 PM   #3
scottjoplin is offline scottjoplin  Wales
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Monoblocks a likely to hum less
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Old 7th January 2018, 06:03 PM   #4
billshurv is offline billshurv  United Kingdom
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LM3886 opinions sought
25V AC or DC? 25v secondaries are pushing the limits for the LM3886.
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Old 7th January 2018, 07:08 PM   #5
john blackburn is offline john blackburn  United Kingdom
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They are 25 volts AC so around +-35 volts DC. It won't ever be anywhere near flat out and will be well cooled so I was thinking I might be ok. How close to the limit do you reckon is too close? The absolute limit with signal is given as 84 volts.

I have done a point to point LM1875 and a 3875 before, liking the results. I think the 1875 is a lovely sounding chip if you don't need a lot of power and is a tiny thing when done.

Thanks for the input
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Old 7th January 2018, 08:01 PM   #6
scottjoplin is offline scottjoplin  Wales
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It should be ok with an 8 ohm load, pushing it for 4 ohms though Single Chip 50W Stereo Amplifier
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Old 7th January 2018, 08:16 PM   #7
billshurv is offline billshurv  United Kingdom
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LM3886 opinions sought
Here is a good resource to let you decide LM3886 Output Power. If you have a speaker that really doesn't dip below 8 ohms you should be ok, but it was closer to the wire than I wanted to go.
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Old 7th January 2018, 08:28 PM   #8
john blackburn is offline john blackburn  United Kingdom
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Fair comment well made, it may well be asking for bother all considered. Anybody got any thoughts on regulated supplies?
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Old 7th January 2018, 08:46 PM   #9
scottjoplin is offline scottjoplin  Wales
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Unnecessary complexity and expense
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Old 8th January 2018, 01:41 AM   #10
john blackburn is offline john blackburn  United Kingdom
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Ah well, back in the biscuit tin they go. I might live long enough for them to go out of production and be worth a small fortune on a well known auction site, you never know. Better that than needlessly frying them.

Thanks for the input one and all.
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