If you really need 150W RMS then the LM3886 is really not the amp of choice.
You'd be better with a discrete BJT or Mos-Fet amp.
A single LM3886 is only really suitable for 36W into 8R. If you bridge it it can produce 100W into 4R, possibly a bit more.
Above 50W you should be looking at good Class AB designs.
There are Class D designs that are good but I wouldn't recommend any of them.
You'd be better with a discrete BJT or Mos-Fet amp.
A single LM3886 is only really suitable for 36W into 8R. If you bridge it it can produce 100W into 4R, possibly a bit more.
Above 50W you should be looking at good Class AB designs.
There are Class D designs that are good but I wouldn't recommend any of them.
I think either LM3886 or a discrete transistor-based amplifier can sound great. Reaching 150 W with a LM3886 will require some careful paralleling of devices. I have projects for both types of amplifiers:
GitHub - profdc9/SuperGainClone: A stereo layout of Bob Cordell's Super Gain Clone amplifier.
GitHub - profdc9/PowerAmpAudio: Power Amplifier based on Michael Chua's C300 amplifier
If you have not built an amplifier before, a LM3886 is definitely an easier choice to start with. 150 W is a lot of power and perhaps you may consider whether or not a lower amount of power will satisfy your needs.
GitHub - profdc9/SuperGainClone: A stereo layout of Bob Cordell's Super Gain Clone amplifier.
GitHub - profdc9/PowerAmpAudio: Power Amplifier based on Michael Chua's C300 amplifier
If you have not built an amplifier before, a LM3886 is definitely an easier choice to start with. 150 W is a lot of power and perhaps you may consider whether or not a lower amount of power will satisfy your needs.
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regarding the maximum power of different LM3886 configurations have a look at the excellent "taming the 3886" page by neurochrome:
Taming the LM3886 Chip Amplifier: Output Power – Neurochrome
short answer below.
discrete amps will have similar (or less) output at a given supply voltage.
your transformers (25 V AC) will produce about 33 V rectified. so you will have to go for a bridged amp to get 150W, unless you have 2 ohm speakers 😀
Taming the LM3886 Chip Amplifier: Output Power – Neurochrome
short answer below.
discrete amps will have similar (or less) output at a given supply voltage.
your transformers (25 V AC) will produce about 33 V rectified. so you will have to go for a bridged amp to get 150W, unless you have 2 ohm speakers 😀
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the 3 lm3886 parallel amp will not give you 150w/ 4 ohms. Maybe 120, and maybe 75w/8ohms.
You could stack up the windings of the 4 25 v transformers to make +-33 v on two channels, which is beginning to be capable of 150 w. However at 250 va you'll have trouble getting the wattage rms. Class AB you can only get about 1/2 of transformer wattage on the speaker. Rest comes out on the heat sink. You would have to rely on your huge capacitors to supply peak wattage.
For a list of proven bipolar transistor amplifiers check out: A Directory of Apex Audio Amplifiers
For 4 amp peaks on 4 ohm speakers you would need at least 4 output pairs of wimpy 2sa1943/2sc5200.
You playing a party outdoors or something? In my house 70W through a 101 db 1w1m speaker is loud enough for me. Of course lower sensitivity speakers are watt consumers.
For a list of proven bipolar transistor amplifiers check out: A Directory of Apex Audio Amplifiers
For 4 amp peaks on 4 ohm speakers you would need at least 4 output pairs of wimpy 2sa1943/2sc5200.
You playing a party outdoors or something? In my house 70W through a 101 db 1w1m speaker is loud enough for me. Of course lower sensitivity speakers are watt consumers.
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One can bring out quite some watts, from a parallel - bridged lm3886 configuration.
Attached is a 2* 3parallel//bridged lm3886 amp, +_35V rails, 2* dual 25Vrms sec., 300VA (each) trafos, output is taken by RTX6001, 36,15Vrms on 7ohm load (186W).
Attached is a 2* 3parallel//bridged lm3886 amp, +_35V rails, 2* dual 25Vrms sec., 300VA (each) trafos, output is taken by RTX6001, 36,15Vrms on 7ohm load (186W).
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How much amplifier power do you need?
You can calculate approximate power requirements for your specific needs: Crown Audio - Professional Power Amplifiers
One of the important parameter here is the speaker sensitivity.
You can calculate approximate power requirements for your specific needs: Crown Audio - Professional Power Amplifiers
One of the important parameter here is the speaker sensitivity.
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Thanks a lot Actually I want full 40 Watt clean so I decide for 150 Watt so I can get clean 40 Watt that my assumption ....