Hello all,
I have uploaded a new version of the manual, containing a parts list that refer to the prototype board I used for measurements.
I hope this helps
\Jens
I have uploaded a new version of the manual, containing a parts list that refer to the prototype board I used for measurements.
I hope this helps
\Jens
Power Supply sizing
I request your comments for sizing the power supply for these boards. A simple x-over requiring 2 boards will not require as much as 6-8 boards.
At some point 400 mA (or other supply) may be inadequate.
What should we allocate per board?
I request your comments for sizing the power supply for these boards. A simple x-over requiring 2 boards will not require as much as 6-8 boards.
At some point 400 mA (or other supply) may be inadequate.
What should we allocate per board?
Psu
Hello,
If you design you PSU to deliver 50 - 75mA pr. filter board using standard opamps you should be ok. I don't know the power consumption of discrete one
I have just checked the proto board; it idles at max 50 mA.
\Jens
Hello,
If you design you PSU to deliver 50 - 75mA pr. filter board using standard opamps you should be ok. I don't know the power consumption of discrete one
I have just checked the proto board; it idles at max 50 mA.
\Jens
with such little current draw, could this be run off a battery, and just be triggered on/of with a 12v trigger?
if you could get past a complicated PSU, and just use a series of replaceable batteries, that would be awesome.
if you could get past a complicated PSU, and just use a series of replaceable batteries, that would be awesome.
The power requirements of the discrete opamp are very similar, if you budget 75mA per board you will certainly have breathing room.
Batteries are definitely an excellant way to go. A low voltage SLA supply and charger can be cheaper than a quality transfomer supply.
Batteries are definitely an excellant way to go. A low voltage SLA supply and charger can be cheaper than a quality transfomer supply.
i have all the peices necessary for a battery supply, complete with automatic charger and batteries! what is the supply voltage needed?
and what is SLA?
and what is SLA?
Hello,
Regarding the resistors and components that go into this project, I have just had an offer that I found hard to resist. I'm most likely going to be able to get resistors from the E192 series at a very nice price, but only if I get a larger amount than I need for my own boards.
Would any of you be interested in these resistors, I will put together a bag with the different values needed for this project.
Also the supplier I talked to seemed interested in delivering the rest of the components also.
Tell me what you think of this.
\Jens
Regarding the resistors and components that go into this project, I have just had an offer that I found hard to resist. I'm most likely going to be able to get resistors from the E192 series at a very nice price, but only if I get a larger amount than I need for my own boards.
Would any of you be interested in these resistors, I will put together a bag with the different values needed for this project.
Also the supplier I talked to seemed interested in delivering the rest of the components also.
Tell me what you think of this.
\Jens
Jens, any indications on a approximate price for a resistor kit/full component kit?
EDIT: Because I tink it's a good idea😉
/U.
EDIT: Because I tink it's a good idea😉
/U.
I have not calculated the total price of a set of components, but the resistors seem to be about ½ the price indicated in Tyler’s shopping list.
I have not asked about the other components, but it seems to be likely that we can save a lot if we all shop together.
I have not asked about the other components, but it seems to be likely that we can save a lot if we all shop together.
JensRasmussen said:
Since we are at it there is a cheap source for about 1000 Siemens 56pF polystyrene caps (good for compensating the discrete opamps) on Ebay, what about buying 'em all and providing them to the requesters with a small additional charge?
http://cgi.ebay.de/ws/eBayISAPI.dll...&category=12069&sspagename=STRK:MEBWA:IT&rd=1
Cheers
Andrea
To me a component group buy makes most sense as a complete package. The resistors are the cheapest part of the stuffing materials and easy to get; the shipping would eat almost all the savings here. But quality caps may be harder to get. I may be interested if there's a well priced "complete MOX components" package (minus op amps, but incl. header pins and jumpers and maybe incl. DIL op amp sockets).
On a different line, do I recall correctly, for a 24 dB L-R filter of Fc you cascade two 12 dB/oct filter sections of F=Fc and Q=707 each?
On a different line, do I recall correctly, for a 24 dB L-R filter of Fc you cascade two 12 dB/oct filter sections of F=Fc and Q=707 each?
Group buy support
I agree with MBK, however any part of the components bundled would be an advantage. I'd take the resistors if that is the only "group buy" that develops.
I agree with MBK, however any part of the components bundled would be an advantage. I'd take the resistors if that is the only "group buy" that develops.
Thanks for bringing my attention to it. I'm sitting in the library with the issue beside me. Scared me, I didn't know it was there. My REAL request was to source the 8" woofers (Carboneau#24882) included in the design. They aren't to be found. Saddens me that a mag devoted to DIY would include items that can't be duplicated.
Oh well, back on topic.
I do what I can't do to learn how to do it.
Oh well, back on topic.
I do what I can't do to learn how to do it.
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