DcibeL, Thank you for your advice.
I have a further question for the transformer and shall be grateful if you could help me.
If I use that transformor for the Mauro"s Lm3386 with the attached PSU, can I do that with just one transformor?
I have some doubt of the output in V if I just parellal the output. Will it became +35V 0V- 35V?
I have not make any diy for almost 15 years and all memory are gone.
Accept me my silly question.
I have a further question for the transformer and shall be grateful if you could help me.
If I use that transformor for the Mauro"s Lm3386 with the attached PSU, can I do that with just one transformor?
I have some doubt of the output in V if I just parellal the output. Will it became +35V 0V- 35V?
I have not make any diy for almost 15 years and all memory are gone.
Accept me my silly question.
Attachments
Member
Joined 2003
How much heat sinking is enough?
I am assembling my Mauro kit right now and needed some input. I got some heatsink stock from that guy on ebay and wonder how much to use. I've got it cut down to where I could use one piece for both driver chips (LM3886's) or two heat sinks with one HS per driver. The pieces right now are cut at 5" x 2".
How much heatsink is needed or adequate? I will be cranking this amp into 90db speakers in a 21x23 foot room.
Here's a link to some pictures....
http://www.moranplanet.com/tommytube.com/mauro_penasa gainclone/heatsinks for LM3886 amp.htm
thanks,
Tom
I am assembling my Mauro kit right now and needed some input. I got some heatsink stock from that guy on ebay and wonder how much to use. I've got it cut down to where I could use one piece for both driver chips (LM3886's) or two heat sinks with one HS per driver. The pieces right now are cut at 5" x 2".
How much heatsink is needed or adequate? I will be cranking this amp into 90db speakers in a 21x23 foot room.
Here's a link to some pictures....
http://www.moranplanet.com/tommytube.com/mauro_penasa gainclone/heatsinks for LM3886 amp.htm
thanks,
Tom
Re: How much heat sinking is enough?
This one should be fine:
Regards,
Michael
tommytube said:
This one should be fine:
An externally hosted image should be here but it was not working when we last tested it.
Regards,
Michael
Hi All,
I just wanted to throw out my support for Plovati efforts. I would recommend anyone who wants the excellent classic Rev A/C stereo circuit contact him and get in on his offering. It sounds like he is doing a great job, and I wouldn't want anyone to miss out. I am not sure where he is willing to ship, but he has taken on a lot to get this done, and he deserves to succeed. So if you want the stereo board contact him please.
I may offer the original PCBs again at some point but it will not be for a while, so especially for those of you in Italy, please puchase his PCBs. We should all encourage that sort of effort.
Ciao
Russ
I just wanted to throw out my support for Plovati efforts. I would recommend anyone who wants the excellent classic Rev A/C stereo circuit contact him and get in on his offering. It sounds like he is doing a great job, and I wouldn't want anyone to miss out. I am not sure where he is willing to ship, but he has taken on a lot to get this done, and he deserves to succeed. So if you want the stereo board contact him please.
I may offer the original PCBs again at some point but it will not be for a while, so especially for those of you in Italy, please puchase his PCBs. We should all encourage that sort of effort.
Ciao
Russ
Hi All
Mauro did mention right in the beginning the inspiration for this little amp was the MF A370. after some digging (i was looking for circuit to replace my existing mosfet amp's circuit "kraftwerk clone") i stumbled on this circuit. and we can also see where he is comming from.
something i am going to build just to compare if it has the same signature
Cheers
Rudi
Mauro did mention right in the beginning the inspiration for this little amp was the MF A370. after some digging (i was looking for circuit to replace my existing mosfet amp's circuit "kraftwerk clone") i stumbled on this circuit. and we can also see where he is comming from.
something i am going to build just to compare if it has the same signature
Cheers
Rudi
Attachments
rudi said:
Hey Rudi,
I think that schematic is for the P170/P270/P370
I'm not exactly sure what the difference is between an A370 and a P370. Maybe Mauro can say if he heard this one (A370.2):
An externally hosted image should be here but it was not working when we last tested it.
Or something more like this (P180):
An externally hosted image should be here but it was not working when we last tested it.
I have a P150 and P170 in various stages of renovation (they are '80's amps) My P150 is a very nice sounding amp, and I aim to compare them all (RevA, RevC, P150, P170) when I get a chance.
Michael
PCB ready gold plated
Just arrived the PCB from Mauro's Rev.A gerber.
Slighty mods:
reduced spacing between board edge (side LM3886) and Lm3886 pin to avoid interference with heath sink: tested ok, PCB does not touch heatsink with Lm3886TF (isolated)
Added a extra hole for mounting
Added wire connection on silk layer and AA BB letter to facilitate the individuation of point to be wire connected
Added few pad for SMD 0805 Rev. C component mounting or helping to solder the trditional one on solder (copper) side.
No solder so all the trace are available to solder some future components or mods
70um copper
Gold plating to avoid oxidation and make better contact.
Top view:
Just arrived the PCB from Mauro's Rev.A gerber.
Slighty mods:
reduced spacing between board edge (side LM3886) and Lm3886 pin to avoid interference with heath sink: tested ok, PCB does not touch heatsink with Lm3886TF (isolated)
Added a extra hole for mounting
Added wire connection on silk layer and AA BB letter to facilitate the individuation of point to be wire connected
Added few pad for SMD 0805 Rev. C component mounting or helping to solder the trditional one on solder (copper) side.
No solder so all the trace are available to solder some future components or mods
70um copper
Gold plating to avoid oxidation and make better contact.
Top view:
Attachments
Just a note about the heat performance of my case and some responses of visitors regarding my Mauro amp.
I've had a LOT of visitors recently, and about 55 people over for my 50th birthday party. It wasn't a dance party, so I have no tale of woe about the amp catching fire or anything like that
We left the test system running on the dining room table from about 9am until the following morning around 2am. This is the Mauro, Russ's FreeBird, Rotel 965BX CDP and my Tannoy 603 small bookshelf speakers. People swapped CD's as they felt, there was probably something on about 2/3 the time. Volume was louder than normal because of the extra background noise.
By about 10PM the rear of the case adjacent to where the 3886's are located, was hot to touch, but not so hot you had to remove your finger, It got no hotter than that. I have thought about adding a small heatsink to the back of the case, but I'm not sure it is required, I may wait until summer to see how it goes in warmer weather.
During the party there was a lot of talking going on, but I still had many comments about the sound and look of the amps. When things got quieter, and at other times, a few people have had a more serious listen. All have been delighted at the sound quality, some are genuinely stunned. My sister 'wants one'
Have to say that's a pretty positive endorsement of the amp.. Well done Mauro, Russ and everyone else involved. Can't wait to have a go at RevC!
Michael
I've had a LOT of visitors recently, and about 55 people over for my 50th birthday party. It wasn't a dance party, so I have no tale of woe about the amp catching fire or anything like that
We left the test system running on the dining room table from about 9am until the following morning around 2am. This is the Mauro, Russ's FreeBird, Rotel 965BX CDP and my Tannoy 603 small bookshelf speakers. People swapped CD's as they felt, there was probably something on about 2/3 the time. Volume was louder than normal because of the extra background noise.
By about 10PM the rear of the case adjacent to where the 3886's are located, was hot to touch, but not so hot you had to remove your finger, It got no hotter than that. I have thought about adding a small heatsink to the back of the case, but I'm not sure it is required, I may wait until summer to see how it goes in warmer weather.
During the party there was a lot of talking going on, but I still had many comments about the sound and look of the amps. When things got quieter, and at other times, a few people have had a more serious listen. All have been delighted at the sound quality, some are genuinely stunned. My sister 'wants one'
Have to say that's a pretty positive endorsement of the amp.. Well done Mauro, Russ and everyone else involved. Can't wait to have a go at RevC!
Michael