Agreed. Make 2 different pad sizes and be done with it. Ive tried the more expensive inductors and still the coil craft still are more dynamic.
Thanks for the suggestion, just ran the numbers. First number is Q, 2nd number is Fc (-3dB corner), then frequency/dB gain pairs. 15uH + 2.2uF is probably the best option, however it's a tight fit (it'll probably touch the inductor) and the 2.2uF cap costs a bit more.
15uH + 1uF
0.51640
41094
10000 16000 18000 20000 22000 400000
-0.44202 -1.10009 -1.37536 -1.67504 -1.99679 -39.61138
15uH + 1.5uF
0.63246
33553
10000 16000 18000 20000 22000 400000
-0.22141 -0.66477 -0.88748 -1.15243 -1.46063 -43.06871
15uH + 2.2uF (2.2uF is a tight mechanical fit)
0.76594
27705
10000 16000 18000 20000 22000 400000
0.094476 -0.054779 -0.226176 -0.482845 -0.832495 -46.373813
15uH + 2.7uF (likely won't fit)
0.84853
25009
10000 16000 18000 20000 22000 400000
0.325199 0.374407 0.214618 -0.078281 -0.515157 -48.148374
For comparison, 10uH + 1.5uF:
0.77460
41094
10000 16000 18000 20000 22000 400000
0.071075 0.121330 0.119509 0.100384 0.058547 -39.516599
That being said, I'll sell it if anyone wants it.
15uH + 1.5uF will be fine for me, if that makes things any easier.
I know I said I needed the 4ohm setup, but now that I see the difference... go ahead and let someone else have the 10uH coils.
I can't hear past 16k anyway.
If I'm really curious I can swap in my own 2.2uF caps. I've got some laying around here. Various types, in fact.
I know I said I needed the 4ohm setup, but now that I see the difference... go ahead and let someone else have the 10uH coils.
I can't hear past 16k anyway.
If I'm really curious I can swap in my own 2.2uF caps. I've got some laying around here. Various types, in fact.
I previously ordered a board, but did not get around to updating my request ... to mention that I would prefer 8 ohm. Recent posts seem to indicate that it might have helped if I'd let you know before now. I apologize for any inconvenience.
I haven't had a chance to go through the thread to see if I need to clarify anything else, but I'll look in the next day or so.
Thanks, Ron
I haven't had a chance to go through the thread to see if I need to clarify anything else, but I'll look in the next day or so.
Thanks, Ron
So anyway, current standings.. I need 68 10uH inductors for amps currently sold, plus 4 for the single 8 ohm amp that was sold with a filter kit. Need 72, getting 40.
Right now I'm hunting for different output inductors that'll fit in the same mechanical footprint, and I'll make another spin of the PCB that'll take the new inductor (and ideally the old one too) with no other circuitry changes. I'll order that PCB as soon as it's done, it'll probably arrive a couple weeks after the 1st batch.
So Sangamo 7G14A-100M fits in the same physical dimensions as the Ice part, 236 in stock at inductors.com. The inductance/current curve looks pretty good, though the data table says 8.3A saturation current with saturation defined below as -25% inductance *shrug* I'll cross my fingers and trust the curve.
http://www.sagami-elec.co.jp/file/7G14A-7G14C.pdf
Only real pain in the *** thing about it is the flat leads. Doesn't look like I can get plated slots done, I'll fire the part in eagle, create big lead holes and hope it routes nicely.
I'll go this route unless another inductor suddenly jumps out that looks good. Coilcraft has a few promising options...
Right now I'm hunting for different output inductors that'll fit in the same mechanical footprint, and I'll make another spin of the PCB that'll take the new inductor (and ideally the old one too) with no other circuitry changes. I'll order that PCB as soon as it's done, it'll probably arrive a couple weeks after the 1st batch.
So Sangamo 7G14A-100M fits in the same physical dimensions as the Ice part, 236 in stock at inductors.com. The inductance/current curve looks pretty good, though the data table says 8.3A saturation current with saturation defined below as -25% inductance *shrug* I'll cross my fingers and trust the curve.
http://www.sagami-elec.co.jp/file/7G14A-7G14C.pdf
Only real pain in the *** thing about it is the flat leads. Doesn't look like I can get plated slots done, I'll fire the part in eagle, create big lead holes and hope it routes nicely.
I'll go this route unless another inductor suddenly jumps out that looks good. Coilcraft has a few promising options...
I'm happy to be in the group waiting.I will be contacting you about paying by Interac (if that is OK) shortly.
dave
GMarsh - how easy would it be to solder the inductors after the other SMT parts are on the board?
If there is access to solder the pads is reasonable then I'm happy to take delivery of 2 of my boards without the inductors so others can get to taste the wiener. Hmmm, that sounded a bit different in my head than when I wrote it.
In any case, I can get them from Mouser in May. Maybe I'll have you build up the other boards (w/o inductors) if that's reasonably close to a wash on the price.
If there is access to solder the pads is reasonable then I'm happy to take delivery of 2 of my boards without the inductors so others can get to taste the wiener. Hmmm, that sounded a bit different in my head than when I wrote it.
In any case, I can get them from Mouser in May. Maybe I'll have you build up the other boards (w/o inductors) if that's reasonably close to a wash on the price.
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Guglielmope: got your e-mail.
Inductor hunt continues, but it looks like Sagami is the way to go.
Inductors are through-hole, as are the filter caps, and I've got the holes oversized a bit for both to facilitate rework. Should be easy to change them out with a decently powerful iron and a bit of solder wick.
Inductor hunt continues, but it looks like Sagami is the way to go.
Coilcraft MSS1210 Inductors
gmarsh,
Have you considered using the Coilcraft MSS1210 inductors, also available from Mouser?
Drawback is they are surface-mount.
Maybe you can make the solder pads for the through-hole inductors big enough and such that it fits the configuration of these SMT inductors.
These inductors are then not only an option for solving the lack of stock problem, but also as an option for experimentation.
gmarsh,
Have you considered using the Coilcraft MSS1210 inductors, also available from Mouser?
Drawback is they are surface-mount.
Maybe you can make the solder pads for the through-hole inductors big enough and such that it fits the configuration of these SMT inductors.
These inductors are then not only an option for solving the lack of stock problem, but also as an option for experimentation.
The 1D14A footprint is a 10x15mm rectangle, and the board's pretty tightly packed - I can't easily change the footprint for a 12x12mm inductor without making the board 6x10cm versus 5x10 cm.
The 1D14A has the performance it has because it's vertically wound inside and 16mm tall, pretty much equivalent to a Coilcraft MSS1583 with wires coming out the side instead of on the bottom. Airwiring on MSS1583 is a possibility - mount the inductor on its side to the board with hot glue or whatever, and add wire straps from the PCB vias to the inductor leads. Not really something I'd like to do for production and MSS1583 is fairly spendy... but hey, it'll work.
Looking at toroids now, trying to find a hard saturating material, winding inductors might be a possibility.
Chances are I'll just go with the Sagami.
The 1D14A has the performance it has because it's vertically wound inside and 16mm tall, pretty much equivalent to a Coilcraft MSS1583 with wires coming out the side instead of on the bottom. Airwiring on MSS1583 is a possibility - mount the inductor on its side to the board with hot glue or whatever, and add wire straps from the PCB vias to the inductor leads. Not really something I'd like to do for production and MSS1583 is fairly spendy... but hey, it'll work.
Looking at toroids now, trying to find a hard saturating material, winding inductors might be a possibility.
Chances are I'll just go with the Sagami.
Just leave the inductors off one of my 4 ohm boards and one 6 ohm. That will let two others get boards.
Current list of paid orders in the order they were paid, left column is the # of 10uH inductors required added up line by line.
0 bk856 - 2 bare PCB, 2 bagged uC's
8 impuls60 - 2 x 4ohm
12 nickk - 6ohm, filter kit, mounting kit, and bare PCB w/soldered uC
12 reo - 16ohm + 8ohm + 0.22uF caps + bare PCB w/soldered TPA and uC
16 goo - 4 ohm
20 andrewcorbett - 4 ohm
32 aterren - 2x4 ohm, 1x6 ohm, 2 bare PCB w/soldered micro
32 afoor - 4 bare PCBs w/bagged uC's
40 CFG - 4 ohm + 8 ohm + "8 ohm" filter kit
Everyone below this line won't get 1D14A inductors until may, unless people above change their order or volunteer to move themselves down the list.
40 Hammett - 8 ohm + thermal kit
44 matt_garman - 6 ohm
44 shadowlight - 16 ohm + 8 ohm
48 cogitech - 4 ohm
48 zog666 - 8 ohm + thermal kit
52 zoidbergslo - 6 ohm + filter kit
56 lutton - 6 ohm + filter kit + thermal kit
60 joel wesseling - 4 ohm + 8 ohm
68 johan du rand - 2 x 6 ohm
68 bob690 - 8 ohm + filter kit + thermal kit
72 linkfan - 4 ohm + 8 ohm + 2 mounting kits
72 vanofmonks - 2 bare PCBs + 2 bagged uC's
72 nwboater - 8 ohm + mounting kit
72 guglielmope - 8 ohm + mounting kit
72 erik777 - bare PCB + bagged uC
72 finneybear - 8 ohm, unassembled
A dual footprint for Sagami 7G14A and ICE 1D14A works, with the 7G14 mounted slightly askew within the 1D14A footprint. Electrical characteristics on the 7G14A are pretty decent, I wouldn't consider it a step down. Modifying the PCB now for it.
0 bk856 - 2 bare PCB, 2 bagged uC's
8 impuls60 - 2 x 4ohm
12 nickk - 6ohm, filter kit, mounting kit, and bare PCB w/soldered uC
12 reo - 16ohm + 8ohm + 0.22uF caps + bare PCB w/soldered TPA and uC
16 goo - 4 ohm
20 andrewcorbett - 4 ohm
32 aterren - 2x4 ohm, 1x6 ohm, 2 bare PCB w/soldered micro
32 afoor - 4 bare PCBs w/bagged uC's
40 CFG - 4 ohm + 8 ohm + "8 ohm" filter kit
Everyone below this line won't get 1D14A inductors until may, unless people above change their order or volunteer to move themselves down the list.
40 Hammett - 8 ohm + thermal kit
44 matt_garman - 6 ohm
44 shadowlight - 16 ohm + 8 ohm
48 cogitech - 4 ohm
48 zog666 - 8 ohm + thermal kit
52 zoidbergslo - 6 ohm + filter kit
56 lutton - 6 ohm + filter kit + thermal kit
60 joel wesseling - 4 ohm + 8 ohm
68 johan du rand - 2 x 6 ohm
68 bob690 - 8 ohm + filter kit + thermal kit
72 linkfan - 4 ohm + 8 ohm + 2 mounting kits
72 vanofmonks - 2 bare PCBs + 2 bagged uC's
72 nwboater - 8 ohm + mounting kit
72 guglielmope - 8 ohm + mounting kit
72 erik777 - bare PCB + bagged uC
72 finneybear - 8 ohm, unassembled
A dual footprint for Sagami 7G14A and ICE 1D14A works, with the 7G14 mounted slightly askew within the 1D14A footprint. Electrical characteristics on the 7G14A are pretty decent, I wouldn't consider it a step down. Modifying the PCB now for it.