OK, false alarm, the Singapore supplier is out of stock on 2SK389 (catalog was from 23 Dec 03, so they seem to be moving fast).
Their pricing seems to be for real though, inquiring about 50 pcs. of 2SK170 , which they do have in stock, I got quoted about 13 cents, which is that catalog price. The 2SK389 in the same catalog was quoted at 60 cents.
Their pricing seems to be for real though, inquiring about 50 pcs. of 2SK170 , which they do have in stock, I got quoted about 13 cents, which is that catalog price. The 2SK389 in the same catalog was quoted at 60 cents.
PCB size
Hello,
The PCB is 10 x 16 cm (100 x 160 mm)
http://www.delta-audio.com/Active filter two.htm
\Jens
Hello,
The PCB is 10 x 16 cm (100 x 160 mm)
http://www.delta-audio.com/Active filter two.htm
\Jens
Tiroth,
They are looking good. Waiting to hear about the results. Give us some info on the discrete opamp, how it fits with the DIP socket, output offset voltage, if any. How will a full compliment of the discrete opamps fit on the main board. I'm looking forward to getting started on this project. Great job.
BDP
They are looking good. Waiting to hear about the results. Give us some info on the discrete opamp, how it fits with the DIP socket, output offset voltage, if any. How will a full compliment of the discrete opamps fit on the main board. I'm looking forward to getting started on this project. Great job.
BDP
Looks very nice and mighty "technical". Much better to show off than my spaghetti like protoboard dipole EQ and X- 
.
2 questions: What is the total height incl. standoffs and fitted op amp boards? (for enclosure size). And, how is the connection made between op amp boards and main board - right angle pin strips?
.2 questions: What is the total height incl. standoffs and fitted op amp boards? (for enclosure size). And, how is the connection made between op amp boards and main board - right angle pin strips?
Looks great! I was initially quite concerned with the board size, since I wanted to do some high order filters for my ribbon tweeter 2-way, but I have decided to just do a seperate chassis for each channel, and see how it works out, along with a stereo amplifier chassis for each channel to power the speaker.
I noticed that the boards look roughly cut apart. Are you production boards going to be cut apart by the manufacturering place?
--
Brian
I noticed that the boards look roughly cut apart. Are you production boards going to be cut apart by the manufacturering place?
--
Brian
The discrete opamps fit great. If you are using DIP sockets they plug right in with the bypass caps in place so you can switch the discrete in and out with your favorite opamp. If you aren't using sockets, it is probably a good idea lay the bypass caps down on the board. Or just put them on the bottom if your standoffs are as tall as the ones in the pic.
I bought both threaded standoffs and (cheaper) .375" spacers to tie the boards together. While the standoff definitely makes it a bit more mechanically solid, I think the spacers work fine. The combination of the screw thread and the wire power links at the top of the tower make it sturdy enough to plug and unplug many times.
MBK, I'll post the exact dimensions for you tonight, since I'm currently at work. I am indeed using right angle pin strips with 20-mil size pins. Wire links could also be used.
I'll also post the exact footprint of the assembly for those who are interested in replacing opamps in existing designs.
Brian, you're quite right. To save proto costs (to the tune of about $150) I got the protos unscored and dremeled them apart.
The production boards will be scored by the board shop.
Test results tonight for the MOX and a sanity check to make sure all is well with the discrete opamp. I won't have detailed opamp measurements until Thursday night.
I bought both threaded standoffs and (cheaper) .375" spacers to tie the boards together. While the standoff definitely makes it a bit more mechanically solid, I think the spacers work fine. The combination of the screw thread and the wire power links at the top of the tower make it sturdy enough to plug and unplug many times.
MBK, I'll post the exact dimensions for you tonight, since I'm currently at work. I am indeed using right angle pin strips with 20-mil size pins. Wire links could also be used.
I'll also post the exact footprint of the assembly for those who are interested in replacing opamps in existing designs.
Brian, you're quite right. To save proto costs (to the tune of about $150) I got the protos unscored and dremeled them apart.
The production boards will be scored by the board shop.Test results tonight for the MOX and a sanity check to make sure all is well with the discrete opamp. I won't have detailed opamp measurements until Thursday night.
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