Here is a PDF that shows some common types compared to the standard resistor footprint that I have used for all my projects.
With some patience 0603 and up are really not that hard (IMHO)
\Jens
With some patience 0603 and up are really not that hard (IMHO)
\Jens
Hi,
Anything is possible, but I would like to make the MKII boards fit the skills of the larger part of the builders....
I guess that a larger PCB would make different caps an option too.... but that will be more expensive due to the larger PCB area.
\Jens
Anything is possible, but I would like to make the MKII boards fit the skills of the larger part of the builders....
I guess that a larger PCB would make different caps an option too.... but that will be more expensive due to the larger PCB area.
\Jens
Jens,
would it be possible to use 8pin sockets to mount the caps?
Then one could tune the frequency by swapping headers with matched caps ready soldered in.
would it be possible to use 8pin sockets to mount the caps?
Then one could tune the frequency by swapping headers with matched caps ready soldered in.
You young guys with near vision that works. 😉 I've done 1205 without too much difficulty. How's that for a compromise?
I was thinking of mounting receptacles like that Jens. Thanks for showing that I am not completely nuts.
How about pads on the bottom for SMD bypass caps to help out with the higher speed opamps?
I was thinking of mounting receptacles like that Jens. Thanks for showing that I am not completely nuts.
How about pads on the bottom for SMD bypass caps to help out with the higher speed opamps?
variable phase shift
I want to integrate a mono sub with a crossover at 100Hz.
It must have 0-180 degrees variable fase shift.
I am confused about the math. As i see it i must have 0,005 sec delay capability. With the all-pass section i can get about 0,0015 sec (10K resistor with 220pF cap).
If the math is correct?, do i need 4 all-pass sections?
Any other solutions to tackle this?
I want to integrate a mono sub with a crossover at 100Hz.
It must have 0-180 degrees variable fase shift.
I am confused about the math. As i see it i must have 0,005 sec delay capability. With the all-pass section i can get about 0,0015 sec (10K resistor with 220pF cap).
If the math is correct?, do i need 4 all-pass sections?
Any other solutions to tackle this?
BobEllis said:
1205s are easy....I don't have to use my microscope until I get down to 0806s and 0603s, although I do use it check any entire SMD circuit for bridges etc. after I've placed an entire group of components.
Bottom side SMD bypass caps sounds like a great idea.
Robert
Jens and Bob-
I bought several of these boards for conventional cross overs but yesterday I came accross a new need and was curious to see if these boards might work.. Please bare with me on the explaination on the requirement..
I picked up my "latest and greatest" version of Mr. Erath's Feedback Network Controller yesterday and it is VERY promising.
He uses a feedback circuit that includes the amp and the woofer VC in the loop to make adjustments to the circuit. The problem is he is an elderly man (to be nice) and still uses the TL084 opamps and sub par components..
I was hoping to do away with his crossover sections and use these as the XO and incorporate his circuit on an IC on your boards.
What I would need on a board is a 12db hi-pass @ 15hz for a rumble filter, a 24 db low pass @ x for the woofer, and then his circuit which is an op amp (with external network I can solder to the pins) and a buffer after.
So the question is can one board handle the above for one channel, and if not, could it do just the rumble filter and 2 op amps needed for his circuit?
I am looking at the WIKI and the like to the schematic is dead and I have no clue by looking at the silk screen.
I have no problem with sending you two a copy of his FBN circuit directly to advise, but since this is patented material I won't post it here.
His circuit alows me to use a 15" woofer in a 1.25 cf enclosure or 2 x 10" woofers in a 1 cf enclsr and get a flat response from 125 - 20hz. They are not SUBs but rather the woofer section of a 3 way.
I bought several of these boards for conventional cross overs but yesterday I came accross a new need and was curious to see if these boards might work.. Please bare with me on the explaination on the requirement..
I picked up my "latest and greatest" version of Mr. Erath's Feedback Network Controller yesterday and it is VERY promising.
He uses a feedback circuit that includes the amp and the woofer VC in the loop to make adjustments to the circuit. The problem is he is an elderly man (to be nice) and still uses the TL084 opamps and sub par components..
I was hoping to do away with his crossover sections and use these as the XO and incorporate his circuit on an IC on your boards.
What I would need on a board is a 12db hi-pass @ 15hz for a rumble filter, a 24 db low pass @ x for the woofer, and then his circuit which is an op amp (with external network I can solder to the pins) and a buffer after.
So the question is can one board handle the above for one channel, and if not, could it do just the rumble filter and 2 op amps needed for his circuit?
I am looking at the WIKI and the like to the schematic is dead and I have no clue by looking at the silk screen.
I have no problem with sending you two a copy of his FBN circuit directly to advise, but since this is patented material I won't post it here.
His circuit alows me to use a 15" woofer in a 1.25 cf enclosure or 2 x 10" woofers in a 1 cf enclsr and get a flat response from 125 - 20hz. They are not SUBs but rather the woofer section of a 3 way.
The schematic is available on my website. I'll point the WIKI link there. One board will handle the bandpass requirement you propose for the woofer with a high pass section left over. Whether the rest can be cobbled together on the board is open.
Have you considered just rebuilding his board with higher quality parts? That might be the easiest thing to do.
Have you considered just rebuilding his board with higher quality parts? That might be the easiest thing to do.
Trust me on this, the man is a genius on design but a flunkie on execution.
His nickname is "the wire burner" because he hits EVERTHING with his solder iron...
😀
I will see if I can scan his hand drawn schematics and email them to you...
These boards (yours and Jens) are much better executed and would probaly be ideal, I am just verifying.
EDIT:::::
YEAH!!!
I just looked at it on your site, and am sure it will do everything required!! Now to figure out how to impliment it!
His nickname is "the wire burner" because he hits EVERTHING with his solder iron...
😀 I will see if I can scan his hand drawn schematics and email them to you...
These boards (yours and Jens) are much better executed and would probaly be ideal, I am just verifying.
EDIT:::::
YEAH!!!
I just looked at it on your site, and am sure it will do everything required!! Now to figure out how to impliment it!
BOARDS HAVE SHIPPED
Advanced must have needed a bit more business on the books for November and shipped the boards early. I should have them early next week. I plan to have them all shipped out by November 29th, since I leave on business the following morning.
Advanced must have needed a bit more business on the books for November and shipped the boards early. I should have them early next week. I plan to have them all shipped out by November 29th, since I leave on business the following morning.
Hi Bob,
put my UK delivery to the end of your priority listing and if I have to wait then no problem.
I have still to get back to you on that last Email schematic etc.
put my UK delivery to the end of your priority listing and if I have to wait then no problem.
I have still to get back to you on that last Email schematic etc.
It turns out that the holiday weekend impacted shipping by quite a bit. Delivery to me is scheduled for 12/1. I should be able to pack up the orders over the weekend and get them out on 12/4.
Sorry to disappoint, but when I started packing up I realized I don't have the heat sinks yet. I'll try to get non heat sink orders out this week and should have the sinks by the end of the week.
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