Stephen's Monster Mono's

laatsch55

laatsch55

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Gillette, Wyo.
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Halfbiass...Electron Herder and Backass Woof
After Johans conversion, I will attempt what I have been trying for 2 years, to finally get a WOPL over 600 watts a channel....it may even be closer to 700 into 8 ohms.
The heart of this is Joe's Driver boards and now that the 700 backplane boards are a reality we can finally try it. The ability to take a 700 chassis and cascade the entire output section and make it one complemenmtary channel is necessary to drive 4 ohm loads HARD , all day long. Each channel will have 2-800VA toroids paralled on the DC side with 4-35,000uf caps (like the one pictured). The idea behind the power supplies are to keep power supply droop to a minimum EVEN driving difficult loads. That, coupled with 22 output devices per channel will spread the current to acceptable levels. The heatsinks will be copper like the others I've done WITH DOUBLE THE EFFECTIVE RADIANT area. They will be 7' X 14"EACH, with 8 for each channel. Rail voltage will be +/- 118 volts DC. And that rail voltage being VERY STIFF. Each chassis will have it's own faceplate with one meter in the middle. there will be 4 separate enclosures --2-power supplies and 2 amp modules. The power supplies will weigh close to 60lbs each.
Each 1/2 of each power supply will have it's own soft start module limiting the inrush current to 3-1/2 amps , charge time of almost 4 seconds. Those soft start modules have also been designed by Sir Joe. The inside of the chassis will not have one iota of AC voltage(except the output) or AC current. Dc protect will be outboard(an idea also promulgated by Sir Joe. There will be no thermoswitch, cooling will be monitored with a temp sensor with a PWM controlled fan setup. DC rail fuses will be in the chassis where the transformer used to be, that is also where the power supply cable will enter, opposite of where the output will be.
This may seem extreme, but , it should drive any speaker system into the ground if necessary and make those really difficult loads sit up and pay attention...
If all my suppostions are less that what I believe they will be the power supplies are upgradeable to twice what they are now, I will add 2 more toroids , one on top of the original 2, and 4 more caps..

This will be a very time consuming project(not to mention the money) but I hope to have them ready for the RMAF....

I would like to publicly thank Sir Joe for his help and support for without that this project would not be possible, thanks Joe. Wish me luck folks.......I'm PUMPED!!!!!!!

PS. The original 700 power supply was a 1500va transformer, with 19,600uf capacitance, and 100+/- volts DC rails.......

PSS.... and if can be done in time the chassis will be made entirely out of copper also...
 

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I see you're diving in head first as always. No getting in at the kiddie end for you!

Did you ever consider using 220 to get the rail voltage up? I know it would require a rewire for most homes in the US but that would get you more dc voltage for the rails.

That is going to be quite the system and like you said it's going to take some coin to get all of the components - good luck Lee. It's good that you have Joe as a consulant/designer - can't go wrong there.
 
Absolutely necessary in this regard, a man can toast a lot of money in a hurry...
 
Yeah man... if you pull 'er off Lee, holy moly... time to take it and the horns out to the oil field point the woofers downward, and there ya go.
 
Stephen has a set of K-horns ne drives with a pair of Bryston 7B ST's, with an output of 900 per. can't reach that but I think these will sound a lot better...
 
Joe, on the sequencer, the 12 volt trigger is a maintained voltage? And the SSR relays are paralleled? And of the R3,4,5,6 ONLY the resistor that is chosen for the delay desired is populated?
 
laatsch55 said:
Joe, on the sequencer, the 12 volt trigger is a maintained voltage? And the SSR relays are paralleled? And of the R3,4,5,6 ONLY the resistor that is chosen for the delay desired is populated?
Click to expand...

Hi Lee
The 12V trigger input is a signal that is typical on a lot of preamps. When the preamp turns on it asserts the 12V trigger signal and holds it at that level.

The SSRs are parallelized with a limiting power resistor in series with each SSR except for the last SSR which is direct (and therefore shorts out the other 4 SSRs. In the example I mapped out for Skratch, the series limiting resistors were 150 ohm 100W resistors.

It is a 5 stage turn on Lee. When the trigger is applied the first SSR1 kicks immediately, followed by SSR2 410msec later followed by SSR3 after 820msec later followed by SSR4 after 1.65seconds and finally SSR5 after 3.3 seconds. That is the Skratch example I sent you.

SSR1-4 have the 150 ohm 100W resistor in series with them, SSR5 shunts across all those relays.
 
So R3,4,5,6 are all populated with the values shown..?
 
laatsch55 said:
So R3,4,5,6 are all populated with the values shown..?
Click to expand...

Yes if you like those time delays. If not you can change them in the spreadsheet and it will recalculate it for you.

The areas in green are your playground. the other fields auto-calculate the results.
 
No I'm happy with those values. Are the LED's anything special?
 
I don't see a dsignator for the BR... Nice sketch Joe. I can decipher the photo now..
 
OK, I've been researching DC ammeters and voltmeters. wanna put one of each on each power supply. Simpson makes some nice 3-1/2" panel meters. Whadda ya think Joe? The 523 series---15046, and 15035..
 
Gepetto said:
Some close ups...

View attachment 12796
Click to expand...

So, the power comes in on the bottom right SSR and leaves on the bottom right SSR. We're interrupting one leg of the AC (the Hot).... I will probably remote mount the board directly below the meters and the SSR's under the main enclosure floor, with the meters and LED's being in the front. The toroids have two small secondary windings a 24 volt center tapped and I'll have to find out what the other one is..
 
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