Yes, as long as there is no soldermask expansion for the vias in the Gerberfile, then the vias will be tented.
I'm going to resurrect the infamous "ARC WELDER' from slewmaster days.
6 pairs of BJT goodness !!! he he. I want a bigger amp than Fire animal'
Oh YEAH !
It will look like science fiction , with dual non-inductive thick film SMD emitter resistors and
massive cancelling rail traces.
I might make one pair of outputs to be the drivers (on the heatsink) - right in the middle ! , so 7 pair NJW0302/0281.
6 pairs of BJT goodness !!! he he. I want a bigger amp than Fire animal'
Oh YEAH !
It will look like science fiction , with dual non-inductive thick film SMD emitter resistors and
massive cancelling rail traces.
I might make one pair of outputs to be the drivers (on the heatsink) - right in the middle ! , so 7 pair NJW0302/0281.
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BTW , 100V rail caps for 85-90V rails will be standard. One crazy high power amp - all standardized for
my set of 6 input stages.
-Hellraiser - CFA
-Wolverine .... my version !!
-Spooky - leach amp
-Eyesee - op-amp on steroids.
-Symasui - Japanese perfection
-Kypton - more Japanese perfection... he he
OS
my set of 6 input stages.
-Hellraiser - CFA
-Wolverine .... my version !!
-Spooky - leach amp
-Eyesee - op-amp on steroids.
-Symasui - Japanese perfection
-Kypton - more Japanese perfection... he he
OS
8 years ago , only one of my builders/testers made one of these input stages.
He "rolled" many a op-amp into this design. he finally tested an OPAxxx op-amp on it.
200+ V/us square waves and phenomenal sound came out - no magic smoke.
Such a strange design , adapted from some obscure corner of the internet.
I can see many refinements that I can incorporate now.
PS - he was listening to what a TL072 , NE5532 , or any other op-amp sounded like at 100 watts. crazy...
It servo's and plays audio leveraging the source/sink of a common $0 .70 cheap chip....
He "rolled" many a op-amp into this design. he finally tested an OPAxxx op-amp on it.
200+ V/us square waves and phenomenal sound came out - no magic smoke.
Such a strange design , adapted from some obscure corner of the internet.
I can see many refinements that I can incorporate now.
PS - he was listening to what a TL072 , NE5532 , or any other op-amp sounded like at 100 watts. crazy...
It servo's and plays audio leveraging the source/sink of a common $0 .70 cheap chip....
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Full niceness. I have the 2U case for this. It's smaller but will power my 8" 2-way dayton speakers perfectly.
I should match or even outperform my harmon Kardon 105W amp.
My new Sub is sort of efficient (90db/1W) , but needs 200+ watts to give me 35mm Xmax.
Soooooo , I need to make that "Arc welder". New arc welder will be full Wolverine tech at crazy wattage. 8-10ga wire is a must.
The lead wires on my KRK woofer are as big as solder wick weaved into the spider. the coil wire looks like a amp inductor.
I guess you need that on a 75mm voice coil that bounces with 35-40mm Xmax.
OS
I should match or even outperform my harmon Kardon 105W amp.
My new Sub is sort of efficient (90db/1W) , but needs 200+ watts to give me 35mm Xmax.
Soooooo , I need to make that "Arc welder". New arc welder will be full Wolverine tech at crazy wattage. 8-10ga wire is a must.
The lead wires on my KRK woofer are as big as solder wick weaved into the spider. the coil wire looks like a amp inductor.
I guess you need that on a 75mm voice coil that bounces with 35-40mm Xmax.
OS
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I don't have a trafo for my sub amp. 1000W SMPS would be nice. The PSRR of the spook drops out of sight at a SMPS's switching
frequency , no wonder this topology is common on subwoofer plate amps. It is also quite reliable. MK and KRK use the spook for
their top of the line 1500$ subs. I ain't gonna pay 1500$ for no flippin' speaker , oligarchs can buy these along with their black sea
sturgeon caviar. Listen to their 2K$ subs while snortin' coke and feelin' ho's on their 50 million dollar yachts.
PS - while DIYA Wolverines nip at the heels of their 20K$ halcro amps. 🙂
OS
frequency , no wonder this topology is common on subwoofer plate amps. It is also quite reliable. MK and KRK use the spook for
their top of the line 1500$ subs. I ain't gonna pay 1500$ for no flippin' speaker , oligarchs can buy these along with their black sea
sturgeon caviar. Listen to their 2K$ subs while snortin' coke and feelin' ho's on their 50 million dollar yachts.
PS - while DIYA Wolverines nip at the heels of their 20K$ halcro amps. 🙂
OS
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What's that mean ?? What if it's covered/ masked. I never did any board house business.
I just want to know if I bake a dozen of these at a time if there will be any issues.
OS
Not using a ground plane on the IPS ? you could make it 4 layer, middle layers are ground planes.
You select how you want the vias handles when you order the boards. If you select tented vias they will be covered in soldermask so they won't be an issue. Any vias drawn as uncovered are treated as pads and left uncovered. Normally the recommend keeping the vias 1mm away from pads. I've never had issues as long as they are off the pad and tented.
Ground planes aren't needed at audio frequency. 4 layer boards cost a lot more and slow down production time with no real benefit.
ground planes .... I ain't designing no RF transmitter. I'll put a faraday cage around it !
yes , 4 pads at the edges of the board one run to G2 star , solder a 50 X 75 mm copper plate over the whole thing.
"Extraterrestrial" design ! 🙂
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I'm modest , I just like the Spooky. If it works for 8 years , I like it. Narcissism can be a strength if used in moderation.
If you consider the weaknesses plaguing the world today , I admit my guilt.
Oh , BTW - I'm Po (poor) , paid 77$ for the woofer , amps parts are from the dumpster. Found 400VA trafo on a pro amp ... cases ,
heatsinks . Americans are the ultimate consumers/ wasters of good stuff !!
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Maybe I am "po" , never got to experience what a rich one could .... but I take shortcuts.
KRK woofer blew a whole panel out of my POLK sub box , I ordered a 25mm Skar audio sub box ( 2.65 cu ft) matches the KRK HO
box. It's port is a slot that matches a 20CM port - lots of air !!
My 150W amp just pushed 20mm on the woofer. I need (clean) 300W to push this woofer. I've never seen a driver like this !
10CM port can't handle this woofer. I guess the rich ones that spend 1500$ DO get their money's worth for that KRK.
But , I can design what I need. of course , I will share the "spoils" with the DIYA community. Hopefully , I will get some return ?
OS
KRK woofer blew a whole panel out of my POLK sub box , I ordered a 25mm Skar audio sub box ( 2.65 cu ft) matches the KRK HO
box. It's port is a slot that matches a 20CM port - lots of air !!
My 150W amp just pushed 20mm on the woofer. I need (clean) 300W to push this woofer. I've never seen a driver like this !
10CM port can't handle this woofer. I guess the rich ones that spend 1500$ DO get their money's worth for that KRK.
But , I can design what I need. of course , I will share the "spoils" with the DIYA community. Hopefully , I will get some return ?
OS
I will prepare my soldering pencil.
I have done smd soldering many times in the past
Jeff gave me the opportunity.
I have done smd soldering many times in the past
Jeff gave me the opportunity.
Once you approach the middle of the audio band there is a transitioning from the path of least resistance to the path of least impedance, In fact there is very little reason not to use ground planes, its basic signal integrity 101.
This is why we pay attention to positioning of ground traces. Route the feeds with returns. Keep loop area short. Power supply hum and noise is low frequency. Ground planes don't allow control of return paths of these currents. No way to steer them around sensitive parts of the circuit.