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Old 31st July 2012, 01:29 AM   #81
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Quote:
Originally Posted by andrewlebon View Post
Hi Kimberlator
greetings pure coincindence only yesterday i designed pcb for this project
are you following schematic from post 36 thanks for replying
warm regards
andrew lebon
Yup, i've made around from what i have on hand, not very well organized, but seems to be a monster amp, lots of power, i've made the first hi-power check with 3 18" B&C speakers rated at 1400w 8ohm each and almost blow'em up, but what remains silly is the distortion at low volume, so i asked workhorse already what to check in order to avoid such issue....
Cheers Andrew....
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Old 31st July 2012, 01:34 AM   #82
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Hi Kimberlator
greetings thanks thanks at least now i know it works very kind of you
to keep us informed
warm regards
andrew lebon
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Old 31st July 2012, 01:44 AM   #83
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Quote:
Originally Posted by andrewlebon View Post
Hi Kimberlator
greetings thanks thanks at least now i know it works very kind of you
to keep us informed
warm regards
andrew lebon
You can be sure that this design wont disappoint you, i'm certainly positive that i'm missing something and is causing this low-volume issue, but it is a beast, either if used for low freq coupled with lpf as well as with full range, sounds very well, here you can actually feel the power of this amp.
Whenever i have the time i'll post some pics of the last stage and monstruous psu i've built for this amp.
Have a great day Andrew, thanks for the quick reply...
Paul.
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Old 31st July 2012, 01:51 AM   #84
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yes WORKHORSE DESIGNS ROCK was thinking of this monster for a long time its for fun
hes in THE LEAGUE OF EXTRAORDINARY GENTLEMEN
ill finish it soon
warm regards
andrew lebon
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Old 31st July 2012, 03:36 AM   #85
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You're right about that, seems like someone from outer-space give to him such knowledge, very electronics-skilled guy, the best part around this is the fact that he shares his brain-database with us and on top of that he helps everybody in anyway he can, no matter the level of difficult or nature of the issue to discuss, he always has the correct answer, great asset to DIY community, as well as other very skilled members of course, wish you the best luck on your project Andrew, Best Regards, Paul
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Old 31st July 2012, 03:41 AM   #86
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I have a bunch of diy amp & pre-amp schematics that i've found on the net, just in case you need something alike, i can post here to open discuss, let me know.
Take care man...
Paul.
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Old 2nd August 2012, 02:15 PM   #87
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Default pcb


Hi Kimberlator
greetings please can you tell which schematic you made this is the one with 560 ohms and 38k in input section this pcb is for trial run only
so only one pair mje15032 33
warm regards
andrew
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Old 2nd August 2012, 02:30 PM   #88
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Default Design of a CMOS LNA

Hello,

please i need to design a CMOS LNA. can any1 help me out with the circutry.i'll be using multism.

Thanks
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Old 2nd August 2012, 03:36 PM   #89
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Quote:
Originally Posted by andrewlebon View Post

Hi Kimberlator
greetings please can you tell which schematic you made this is the one with 560 ohms and 38k in input section this pcb is for trial run only
so only one pair mje15032 33
warm regards
andrew
Hello Andrew, clean nice job you have there!
Well, i've made the High-Power Version, the one with 12 TO-3 MJ21194 devices per rail, and, as stated before, i've made it salvaging other amps, just to verify if it's actually work or not, since seems to be some temp issues with the design, as well as some resistor values that need to be changed in order to get it work, please note that you certainly will need to stick pre-drivers on a heat sink, as well as the ones on the VAS, they actually reach unsafe temps if not attached to a heat sink, and remember that the "Diode-Connected" transistors to be placed on main heat sink, as they are the "Heat Tracking Devices".
Good luck Andrew,

Paul

Last edited by kimberlator; 2nd August 2012 at 03:44 PM.
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Old 3rd August 2012, 08:20 AM   #90
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Thats very old design of mine.

As Paul already said, the diode connected trannies must be attached to heatsink in order to get proper heat tracking. To enhance the low level signal clarity, put one more diode connected transistor in series with other two already in the schematic and set the trimmer accordingly to get 20mA idle current in output devices.
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