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Old 22nd May 2004, 09:09 PM   #1
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Default A New Le Monstre Lives

Put together an amp for the summer. It genreates almost no heat. Sounds great, but with 13 volt rails and a bias on each section of 300 ma, it limited to high efficiency speakers.
Here a picture of it in operation. Above is a Tao line stage, thanks to Steve Eddy, a line power supply, and the raw supply for a Passdiy Pearl phono.
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Old 22nd May 2004, 09:15 PM   #2
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Default Stuffed Circuit Boards

Boards are from PCB-Design, thanks Kristijan!
Stuffed with modern transistors, and for now all values are close to the suggested values from KK. The resistors are mostly hand matched Allen Bradley 1/4 watt carbon comp. The power resistors are Dale LVR-5, special low inductance, non-magnetic current sensing.
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Old 22nd May 2004, 09:18 PM   #3
Rarkov is offline Rarkov  England
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Some of the nicest casework I've seen! Congrats!


Gaz
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Old 22nd May 2004, 09:25 PM   #4
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Default Power Supply

A 250 watt, 10 volt dual from Victoria Magnetics. Two rails recitified with 20 amp, 100 volt Schottkies.
Capacitors are all 25 volt, 47,000 ufd 4 pole Jensen. Gives 288,000 ufd for a 5 watt amp.
The 4 pole caps place a little isolation into the ground plane. The ground plane is split into three sections. The first has the rectifiers and input to first cap. The second has the output of the first caps, the chokes, and input into the second cap. The final ground loop is the output of the second caps and the actual circuitry.
The two boards and the raw suppply all go to ground through a double diode to provide a little more ground isolation.
Details on these four pole caps is listed on the Jensen website, they are very trick.
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Old 22nd May 2004, 09:30 PM   #5
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Default Business end

El Cheapo 5 ways, same for RCA's. 15 amp Schurter input, dual amp amp switch with sides tied together. Extra panel is for fan if needed.
Switches are to select either output or 25 watt 15 ohm power resistors. The power resistors allow hooking up for runnig in playing without disturbing anyone.
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Old 22nd May 2004, 09:33 PM   #6
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Default Bootom end

This is how cooling air is feed up through the heatsinks. The damping discs are Pearland Texas Mbango. Available at Home Depot.
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Old 22nd May 2004, 09:39 PM   #7
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Default Chokes

The chokes are 2.7 mH, 6 amp. Found surplus at a local parts store. The four pole caps are why there is so much wiring. It is like connecting 12 caps instead of 6.
Got crooked on the LED's. Bin said difused blue, they are red. But looks nice on the copper faceplate.


George
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Old 22nd May 2004, 09:40 PM   #8
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Nice work!
I like the way you mounted those PCBs and the power transistors to the heat sink. I think this is a good way to fix it all and prevent movement of the PCB relative to the power transistors, which ads greatly to the reliability. Have to remember that one!

Jan Didden
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Old 22nd May 2004, 09:41 PM   #9
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Default Wrong pic

I am no computer wizard
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Old 22nd May 2004, 10:56 PM   #10
MikeW is offline MikeW  United States
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Nice job. I love the wood. Thanks again for the extra parts.
What is next?
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