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Chip Amps Amplifiers based on integrated circuits

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Old 19th December 2009, 11:09 AM   #1291
SY is offline SY  United States
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Quote:
Originally Posted by Igla View Post
I also rip all my CDs for MP3 player and for my PC; then for my friends and my friends also lend me CDs to rip and I copy my CDs for my daughter and to have music in my car. And so what.
So what? It's a CRIME and you are STEALING.
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Old 19th December 2009, 12:50 PM   #1292
Atilla is offline Atilla  Norway
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Move this elsewhere, this is a gallery thread.
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Old 19th December 2009, 01:04 PM   #1293
AndrewT is online now AndrewT  Scotland
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Atilla,
I can't send you a message privately. You are turned off.
But, before your comment came up, did you notice that the offending posts had already been removed?
Could you now report your comment and mine and ask for them to be removed?
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Old 24th December 2009, 09:09 PM   #1294
stven is offline stven  United States
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Default First homemade aluminum box

This was a fun project, especially the aluminum work. Amp sounds great and I'm pleased overall. I'd like to pass along a word of thanks to the very fine folks on this forum for their generous spirit and technical expertise. Merry Xmas all!
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Old 25th December 2009, 01:22 AM   #1295
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Quote:
Originally Posted by stven View Post
This was a fun project, especially the aluminum work. Amp sounds great and I'm pleased overall. I'd like to pass along a word of thanks to the very fine folks on this forum for their generous spirit and technical expertise. Merry Xmas all!
Very nice amp stven!. it looks good to me. Congratulations and Merry Xmas to you too!
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Old 27th December 2009, 04:32 AM   #1296
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Default String driver.

Click the image to open in full size.

Here is a board which Supplies 6 Chipsamp.com LM1875 amplifiers and routs the in and out to headers.

It is not actually for an audio amplifier but for a experimental musical instrument
Neutron Physical Guitar Synth.

I expect i may blow a chipamp now and again while experimenting thats why i made them so they can be easilly swapped out.

All the amps are tested, and the board is tested for shorts and continuity, i just have to test the new PSU part, drill the heatsink and bolt on the chips. and then test them all together.

The amps are using the ground strap on the board, and are silent individually, but there is a star ground on the board in case that becomes a problem when everything is working together.
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Old 28th December 2009, 05:34 PM   #1297
udailey is offline udailey  United States
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I read your web page about this guitar. Freakin amazing and what a lot of fun.
Such an awesome hobby when we get to the point that we can get a cool idea and make it happen.
Uriah
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Old 28th December 2009, 07:35 PM   #1298
Pato666 is offline Pato666  Argentina
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Well done Neutron7 !!!!
I'm planning to make a Parallel bridged amp using 3 + 3 LM1875 to reach upto 100W, using dual PSU 22Vcc ---> 16VAC x 6A each and 47000 uF each rail.
But I'll add them a servo circuit to control vcc offset to be "as zero as possibe" LOL..
Well it will take me a while due to my low budget, but i want to do this.

I will use it for a bass amp, so i'll add it a nice preamp too... and nice pair of 10" 98dB 8 ohms each to get 4 ohms parallel... or i'll look for a nice 4 ohms 12".... I'm building my PCBs as well, I've found great PCB manufacturers here in Argentina... so....

Well all advices, comments, etc are wellcome, finally i've found a challenge to do

Good luck with your project and happy new year everyone
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Old 28th December 2009, 10:40 PM   #1299
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You could just as well use 2xLM3886 or 2xTDA7293 in parallel fed from a 2x24 V transformer to achieve the same result with less effort. In theory even a single TDA7293 should be able to deliver 100 W into 4 Ohm, but it will probably run into heatsinking problems.

When you write bass amp, you mean bass guitar amp, not subwoofer amp, don't you? For a bass guitar amp, you will be happier with a tube amplifier. If you find a 10" 8 Ohm woofer that can do 98 dB, do post. Many people will be interested. Until then go for a 1x15" or 2x12" speaker and don't worry too much about the amplifier power. A 100 W amplifier only appears double as loud as a 10 W amplifier.
For subwoofers a solid state or class D amplifier will be a better choice.
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Old 29th December 2009, 10:37 AM   #1300
Pato666 is offline Pato666  Argentina
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Hi pacificblue, thank you so much for your advise.
Quote:
You could just as well use 2xLM3886 or 2xTDA7293 in parallel fed from a 2x24 V transformer to achieve the same result with less effort
Yeas I was thinking maybe to do so, to use 2x LM3886, I already have the LM1875, but I can buy a couple of LM3886 and give it a try.

Quote:
When you write bass amp, you mean bass guitar amp, not subwoofer amp, don't you? For a bass guitar amp, you will be happier with a tube amplifier
Yeas i meant bass guitar amp, i'm sorry i thought i worte that way , anyway I've never done a tube amp before, i'd like to try that too, thanks for the advise.

Quote:
If you find a 10" 8 Ohm woofer that can do 98 dB, do post. Many people will be interested.
Mmhh, I hope the fabricant i've found don't lie to me about those dBs shown in datasheets

Quote:
A 100 W amplifier only appears double as loud as a 10 W amplifier.
Mmhh, thanks for that too... I'm thinking about that too, I think if i want to test how a parallel bridged amp would work, i could try a 2 + 2 LM1875 without even care about the Watts, don't you think? Well, i can get lots of ideas here, there are so many great designs and advices, thanks a lot, I'll post photos soon (i hope).
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