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Slewmaster - CFA vs. VFA "Rumble"
Slewmaster - CFA vs. VFA "Rumble"
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Old 10th February 2019, 07:44 PM   #10101
vargasmongo3435 is offline vargasmongo3435  Puerto Rico
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your plans is to have mostly SMD components into the PCB I think that is great is a lot of advantages by doing that way is gonna be plenty of space to work with with the mix of through hole also are you planing to use multilayer?



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Old 10th February 2019, 07:51 PM   #10102
ostripper is offline ostripper  United States
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"Greenamp" was named for using little current. To go SMD , the IPS would be good if it used almost nothing. The slewmaster , with it's EF3 ... allows VAS currents <4ma. The Kypton ND /greenamp even use less if overloaded.

I'm running the greenamp , in normal mode at 14ma current loads. Overload it , it drops to 11ma per rail. Perfect for SMD.

The output stage of the real greenamp will be the only source of heat in the whole circuit. Most of the time , it will act like a small 30W class AB amp running at 20V rails. Pour the wine , crank it up. It will "sip" the 60V rails and put out 100's of watts. A different approach , but the slewmaster IPS's are already designed to accommodate this "better way" (SMD + low current scheme).

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Old 10th February 2019, 07:53 PM   #10103
rsavas is offline rsavas  Canada
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Aweful soldering job, sot-223 not even sitting flat, must be a 1st timer. I like smt, I hate throwing all those leads in the trash, wondering how many tons of ore & energy to produce my garbage. start to use FJV992,1845 etc.
IPS can fit nicely in 100x100mm, the cheap pcb size, OPS have to be much wider and more expensive pcb.
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Old 10th February 2019, 07:56 PM   #10104
ostripper is offline ostripper  United States
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Quote:
Originally Posted by vargasmongo3435 View Post
your plans is to have mostly SMD components into the PCB I think that is great is a lot of advantages by doing that way is gonna be plenty of space to work with with the mix of through hole also are you planing to use multilayer?



Vargas

With SMD , a single side can be both the SMD underneath and the through - holes on top ... NEATO !
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Old 10th February 2019, 08:01 PM   #10105
vargasmongo3435 is offline vargasmongo3435  Puerto Rico
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oh my God yes I didn't think about that wow! many possibilities
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Old 10th February 2019, 08:08 PM   #10106
ostripper is offline ostripper  United States
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Quote:
Originally Posted by rsavas View Post
Aweful soldering job, sot-223 not even sitting flat, must be a 1st timer. I like smt, I hate throwing all those leads in the trash, wondering how many tons of ore & energy to produce my garbage. start to use FJV992,1845 etc.
IPS can fit nicely in 100x100mm, the cheap pcb size, OPS have to be much wider and more expensive pcb.

That was not mine , I can do better even with sot-23 mini's.
What is nice is the matched n/p channel SOT for differentials.
They are even thermally connected. Offset will be minimized.
A dual differential will fit in a square centimeter.


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Old 10th February 2019, 09:46 PM   #10107
rsavas is offline rsavas  Canada
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what, you do not have any of your smt work to show us
Quote:
With SMD , a single side can be both the SMD underneath and the through - holes on top ... NEATO !
The glue,place,cure,wave process.
This IPS design lends itself well to smt when I see the long runs going across the pcb, you will need lots of vias, but drill hits are free.
look at IMX8, IMT4, common sot-26 along with the DMMT5551_5401
It is funny that all the good Nichicon ecap models are still THT.
Can you post the updated .asc file V1.2?

Last edited by rsavas; 10th February 2019 at 10:15 PM.
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Old 11th February 2019, 02:21 AM   #10108
ostripper is offline ostripper  United States
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No , my hands don't work too good anymore.
Nervous system (spine) is toast.

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Old 11th February 2019, 02:36 AM   #10109
rsavas is offline rsavas  Canada
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For you, I'll solder them up, no charge, my near sighted eyes and a big fat joint, I can solder all day. I started the wife soldering up some small THT stuff. Let me know how I can help you out, PM me if necessary. Cheers

Last edited by rsavas; 11th February 2019 at 02:39 AM.
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Old 11th February 2019, 08:52 AM   #10110
jwilhelm is offline jwilhelm  Canada
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Just order a stencil with the boards and solder in a toaster oven. Much neater job and quick.
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