| j_dunavin |
| And how does it sound? performance? ease of build, ect? |
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| XEAGLEKEEPER |
| Ive built two P101 Mosfet 2-channel High power version they sound fantastic. Very pleased with results. Ive posted pics on esp forum under P101 close to completion. In the amplifier gallery. |
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| PMA |
| I had built the project 83 before it was published ... ;) |
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| TGRANT |
| I’m building his “60 watt into 8 ohm load” amp. It’s completed and I will power it up as soon as I get an hour or two. Before I built it I ran it on a simulator and it simulated fine. I made a few changes because of availability of parts (the low power transistors), and I made my own PCB. I’ll let you know how it sounds, provided I built it correctly and the whole thing doesn’t go up in smoke…. |
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| traw |
| built p101 as well. only pain i had was that i was used to irfp240's which fit 6-32 screw. tapped my holes for 6-32 and bit of effort getting through. i used the aluminum oxide pads as insulators, easier and less fear of puncturing the silpad often used. thing keeping me from using my a whole lot is i need to put a softstart in as i have a 800va toroid in there - usually can start up as long as no signal playing. thinking bout downing to a 500va toroid as this 800 also vibrates the chassis.... but mine is dead silent clean clear and strong. used 6 x 6800uf elna lpa caps (solen, good price). topped it off with vampire jacks and posts. |
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| bushroot |
I built a P101 as well. I was experiencing humming issues, but I'm rebuilding it now to take care of that (think it might have been a wiring issue). These amps are very powerful and very musical.
http://home.comcast.net/~bushroot/index.html
The messy before pictures... |
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| Consul |
| Traw, if I may ask, where did you get that chassis? I'm hoping I can find something like it. Thanks! |
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| traw |
| built from scratch. easier with big heavy heat sinks, when you can find them at reasonable price. although the horizontal arrangement of fins zaps 30-40% of the sinks efficiency, still plenty for class AB. makes mounting top bottom plate easier, don't need angle brackets or squre rods etc. also these heat sinks had a hefty 1/2 base. drill n tap, repeat. |
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| Consul |
| Okay, I think I see how that works. Thank you for the reply! |
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| XEAGLEKEEPER |
Bushroot
Hows the rewiring coming along.:) |
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| bushroot |
| It's coming along very well. I'll post some pictures tomorrow. |
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| SteveA |
I've built several P3a's and three P101s. Using them on my Orion's and very pleased with the results.
The AKSA 55/100s from Aspen are also fun amps to build. They also are great sounding amps.
SteveA |
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| Malotron |
I have bi-amped bridged P3A's driving KEF 8" subs and DoZ P36's for some old 15 ohm Rogers ls3/5a's. It sounds amazing. The designs >buy the ESP kits< are simple, and very forgiving of part substitutions; built with care and quality components they will embarrass most of the retail stuff out there. A pic of my P3a.
-Mal |
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| vynuhl.addict |
I have built the P3a and the Hi Quality preamp..My p3a was extensively modified from the priginal schematic but as is will sound very good but lacking some refinement..The pre amp was using op amps though instead of using the suggested opa2134 i used opa627s class a biased in input and the walt jung composite op amp using ad744/811 for the output, alps blue velvet 100k and the power supply is simple but great sound zener emitter follower using no feedback..
Colin |
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| XEAGLEKEEPER |
malto
Real eye pleasing handywork.
Cheers Dave |
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| TGRANT |
I built the "60 watt into 8 ohm load” amp but I can't get the blasted thing to work. I'm sure it's my fault since I designed and made the PCB, but I can't find the mistake.
Rod's reputation is second to none, so I'm sure I'll get it to work. I did use 2n3906 transistors for the input stage which were not Rod's recommendation. They have similar specs to the ones he recommends, so don’t think that the problem. I could be wrong I guess… |
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| XEAGLEKEEPER |
bushroot
Looking good.... Hows it sound ? Dumb question I know how it sounds. Awesome!!!! And looks alot tidier too. So whats next preamp? Subwoofer? How about a 7.1 channel P101:D
Dave |
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| bushroot |
| I've designed some enclosures in AutoCAD. I took a week or so and taught myself how to use solids and draw in 3D. I'm going to start wire EDM cutting parts soon. I think my next project is going to be a 4 way active crossover, more amps, and a new set of speakers. |
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| head_spaz |
Molotron,
I'm very impressed with your creativity and metalworking skills.
Especially like the homemade heatsinks. Quite original.
Could you post more pics, and perhaps more info on how you made the heatsinks? |
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| bushroot |
| I have a friend that works at an aluminum extrusion plant. You can see his heatsinks on ebay under the seller name barredboss. They are an off the shelf item, but I used two of them per amp board. Each heat sink measures 5.75"x7. Originally, I purchased a 4 foot section from him. I cut each piece and used a carbide face mill to trim them to the desired height in a bridgeport vertical mill. The bottom, rear, and sides are .125" thick. The front plate is .250" x 20" x 8". There is a 1kva toroid in the larger vented black metal enclosure. The smaller enclosure near the side panel is a 12v power supply from Apex Jr. The controller near the front of the enclosure is an Omron Zen "smart relay". This is a micro PLC. This controls the power functions. It turns on the solid state relay (located in the larger box with the rectifiers on a heat sink), turns on the soft start circuit, the 12v power supply, and also turns on an additional large octal relay for the speaker outputs. The light on the vandal switch will light when the speaker outputs become active. |
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| bushroot |
| Ooops, didn't see who the question was directed to. I feel like a dumbass. |
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| Malotron |
| quote: | | Could you post more pics, and perhaps more info on how you made the heatsinks? |
Hello. All the information for making the DIY heatsinks is on the ESP site: http://sound.westhost.com/articles/diy-heatsink.htm
I hindsight I'm not sure it's worth the all the effort. If you have a metal cutting bandsaw a drillpress and lots of sheet aluminum taking up space in your workshop then have a go. For my DoZ amp I found stuff on ebay I could cut to size. How DIY can really save time and money is with a DIY custom chassis designed around surplus extrusions. :)
-Mal |
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