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'Plate Amplifier' Design |
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TONY.A.S.S. 
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Joined: 21 February 2007 Location: United Kingdom Status: Offline Points: 6867 |
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 Posted: 04 January 2014 at 2:46pm |
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That's good, If you design cabs, there's always a thought about putting a module in something. I only have experience with the 500watt BK Module in one of my Hi Fi subs. That's been my only dalliance so far.
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Sagey
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Joined: 28 October 2011 Location: Bristol Status: Offline Points: 50 |
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Posted: 12 January 2014 at 10:37pm |
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Fixed, thank you. |
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audiomik
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Joined: 06 April 2010 Location: Bath, UK Status: Offline Points: 2956 |
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Posted: 19 April 2015 at 2:01am |
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Ok this thread has been unloved for quite a while but due to illness and other difficulties, is being brought back to life with a specific project needing a four channel Plate Amplifier with a specially designed digital LMS included as well.
The new design of Amplifier is to have two twin channel PCB's to make bridge mode easier as well. Roughly 200 watts for Bass, 100 Watts each for Mid and High drivers plus phase correction, First prototypes will be used for a three way 'quality' HiFi box using a 12" ATC in an IB with a Linkwitz Transform built into the system to extend the Bass including Phase correction by the DSP, a 6" mid driver and top compression driver with an 18Sound CD horn or a JBL 'Pepperpot' using a 'high end' BMS compression driver. This cabinet is being designed to work with constant horizontal dispersion plus extended frequency range yet remain relatively small, all as well as can be achieved! Might even have isobaric loading with two drivers (clamshell) for even better Bass ...... Two Amplifier modules in bridge mode for Bass with two more channels for Mid and Hi as well. A specially designed Digital Crossover built by another member on here will complete the internal system for each 'Speaker; but I'll let him tell you about that  Much more to follow for this thread now, hopefully! Mik |
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Warning! May contain Nuts
plus springs, washers, screws, etc, etc. |
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shagnasty
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Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7683 |
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Posted: 19 April 2015 at 2:14am |
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Just speed read the whole thread (some interesting interpretation of a Class A amp with a solar panel, some decoupling may be a plan there.....) but thinking convection cooling even a fast FET amp is pretty stupid, a force cooled tunnel behind the control panel fed by some PWM's fans may be a plan, assuming a linear PSU, place the toroid at the bottom of the cab with the main ressy caps, use a DC>DC to get your preamp rails (a pair of 7815/7915 regs drop more W to your H/sink than the amp would be embarrassing to say the least) you like 3 hi-flow 40mm server fans to punch air through a tunnel with you OP devices bolted to and have your "pre-amp" section between the tunnel and the power board so the H/S shields your low level circuits, use KK molex on your fans and mount them on small plate so you can undo a couple of bolts to blow out the duct at service time...
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mini-mad
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Joined: 13 July 2012 Location: london Status: Offline Points: 6861 |
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Posted: 19 April 2015 at 2:32am |
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a single 80mm fan would be cheaper, quiter and be easier to service.
78XX/79XX regs are bloody silly i agree. but the bigger you can make the heatsink (within reason) the better! saying all this ive driven a quad 405 hard into a big pair of JBLs before and thats convection cooled. banged out its 108w/108w for years this way. wen the summer came i did point a desk fan at them to keep them fairly cool. |
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If it sounds like a gorilla is trying to escape, turn it down.
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shagnasty
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Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7683 |
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Posted: 19 April 2015 at 2:45am |
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I see redundancy is not a word you live by...
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audiomik
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Joined: 06 April 2010 Location: Bath, UK Status: Offline Points: 2956 |
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Posted: 19 April 2015 at 2:52am |
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Yup, a linear PSU and convection cooling!
No FAN noise then to be audible when playing at low level either. Not quite sure about the pre-amp part in your post, as there isn’t one now - only a specially configured, non user adjustable DSP/LMS board. Only a Line level input to the Digital one input plus three output LMS then the Power Amplifier sections..... Mik |
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Warning! May contain Nuts
plus springs, washers, screws, etc, etc. |
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shagnasty
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Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7683 |
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Posted: 19 April 2015 at 3:08am |
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"pre-amp" is the LMS bit that won't run on the +/-50V (or whatever I haven't done the sums) rails your OP runs on, so a +/- 15V rail for is pretty standard, if you goes DSP the DSp will need a lumpy, isolated +5/3.3V rail, even if you use a H-bridge output getting the signal section from 30V (+/-30 as H bridge will work for you, but you will need nearer +/-50V for A/B class) will need some nice electronics, you could of course use a 10wire tranny and have all the rails off their own winding.... As for cooling, active fans are a great idea, no fan noise at low level and no shutdown at full clap (by which time fan noise is not a factor...) carefully PWM'd cooling would make the unit a lot more compact and a bit more versatile in crappy environments (clubs, weddings in Marquees in summer being 2 extremes of gig but both a PITA for amps...) with a linear PSU even your bridge rec (or recs if you run 10wire) will dump heat, you could save a good lump of ally and make a more reliable unit with a bit of fan assist ( I am not think Hp DL380 G3 here where small children get stuck to the front grill, more a few hundred RPM as the temp rises to keep things under control... |
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mini-mad
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Joined: 13 July 2012 Location: london Status: Offline Points: 6861 |
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Posted: 19 April 2015 at 3:43am |
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no. and neither is a load of screaming little fans  active cooling is ALWAYS a good idea but with 'lower' output amps you CAN get away with passive cooling. but all in all i do believe Mik is trying to keep thi s as simple as poss and still work well. |
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If it sounds like a gorilla is trying to escape, turn it down.
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shagnasty
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Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7683 |
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Posted: 19 April 2015 at 3:45am |
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If your little ones are screaming, you are screwing them too hard!!!!
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mini-mad
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Posted: 19 April 2015 at 3:51am |
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without straying to far off topic (in good old fashion speakerplans style) i have yet to find a 40mm fan that isnt just plain old noisy. and that includes using old tricks like rubber mounting them too. i even tried using 40mm fans SO deep they would work as on impeller on a jet ski! even volt modding them doesnt shave to many dB's off the SPL but at this point makes them feckin crap at moving air. |
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If it sounds like a gorilla is trying to escape, turn it down.
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shagnasty
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Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7683 |
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Posted: 19 April 2015 at 4:05am |
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The newer Papst stuff used in servers is now pretty cool, they look like 2 or 3 fans glued together, I have a 20 core G8 server with a load of them (like 16" wide in total) that is really quite even with thing a massive load, but yes I agree historically they had more output than most mid drivers......
V mod does help, PWM ( we use PRS PWM patterns by default) lets you run 2 or more fans way out of phase with each other so you get very little constructive acoustic build with a sensible air flow, given a DSP is involved dumping 3 PWM lines out is hardly rocket salad and the reduce in m2 of the heatsink with a little bit of help is a bonus. Add to that anyone that has ever carried a Mackie 450 for more than 120mm will confirm spikey/slicey/slashy heatsink fins are not fun (Why didn't Mackie mill a 20R rad on to the ends of those fins, they only make that single product, more care would not have been tricky and would have kept them out of areas they shouldn't be in.... Yes, mixers!!! ) As ever whilst trying to sound antagonistic I am just trying to throw up a few ideas that might make Mk1 nearer Mk II and avoid the need for Mk III..... |
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Muckerbarnes1 wrote: