luvdunhill

oh, then I agree with that :)

just curious, does Ray normally publish internal pics? Just surprised to see that he plans to on this one...

I dunno about such a blanket statement like that. Seems rather presumptuous on many counts.

no, the one you ordered (you may have an invoice in your e-mail). let me see what I have. I know I have some, just I have no idea how many..

so... looks like I'm making my own spreadsheet.. So a question. Anyone know a function in Excel that is similar to VLOOKUP but doesn't have this caveat "not_exact_match determines if you are looking for an exact match based on value. Enter FALSE to find an exact match. Enter TRUE to find an approximate match, which means that if an exact match if not found, then the VLookup function will look for the next largest value that is less than value." I'd like it to return the closest value period. None of this next largest nonsense.

Dark forces? Hmm... it's just one a byte change...not exactly rocket science. I could volunteer to send him a patch?

well, one of the better attenuators I've heard was the TKD stepper with S102 shunt, championed by non other than Bob Crump.

Because they are the output of the CRC filters. So, the "D" goes to +V on each board and "A" goes to -V on each board and then GND goes to GND on each board. I'll double check things, but that should be correct. Steve, are you sure you don't have those other resistors? Can you check the invoice?

sorry, got things swapped, the above is correct.

meh, nevermind. I'll call the top left cap terminal "A", top right "B", bottom left "C" and bottom right "D" and all the terminals touching the copper are GND... so you need: terminal with the cutoff on the right bridge goes to "B" the terminal caddy-corner from that one goes to GND terminal with the cutoff on the left bridge goes to GND and the terminal caddy-corner from that goes to "C" next step is the following: (1) 2.2K 3W resistor from "B" to GND (it's blue colored) (1) 2.2K 3W resistor from "C" to GND (4) 0.47 ohm resistors (also blue colored) from "A" to "B" (4) 0.47 ohm resistors from "C" to "D" Let's see what ideas you have to mount the above The 0.47 ohm resistors will get warm, so whatever you do you need to make sure the bodies aren't touching each other, so they can easily dissipate heat.

swt61: you get an "E" for effort, but you might not want to turn things on quite yet. I'll take your pic and mark up the changes edit: can you remind me where the "notches"/"cut off corner" are on those bridges, so I can orient the connections correctly?

yes

maybe mod you transformer boxes with these: DAYTON WRIGHT SPEAKER ELECTROSTATIC LOGAN TRANSFORMER S - eBay (item 390029326226 end time Apr-07-09 08:04:32 PDT)

Here are the resistor lines I'm currently considering. Any opinions on which might be the lower noise and lower distortion resistors? http://www.irctt.com/pdf_files/PFC-COM.pdf http://www.farnell.com/datasheets/3698.pdf http://www.farnell.com/datasheets/43145.pdf By the way, this statement is more or less "Due to special technology used to produce tight tolerance, low TCR at high values the RP73 resistor is not individually part marked"

yay! my jig shipped from front panel express, so I may send that down your way soon as well, if you don't mind. Do you happen to have 3.5mm and 4.5mm drill bits? oh, when placing the devices on the heat sink, you'll want to place them so the long side of the board is oriented along the long side of the heat sink. You can center them, or actually mount the devices an inch or two down from center. This seems to work better in my experience and thermal simulations. I cannot wait to see them mounted with stand offs and what not. Also, those orangish Bergquist pads I sent are decently hearty, but try not to torque down and untorque the devices too many times. If a tear or some other sort of rip occurs in the pads, it will be bad news ... things will burn and you'll be unhappy. So, just treat them as fragile and try not to modify things too much once they get situated. Once the devices heat up, then they will sorta melt and form to the heat sinks. You can lightly sand the semiconductors (!) and the heat sinks as well before mounting the devices. I use 600 grit sandpaper. After your done sanding, clean the area to make sure no aluminum shards are hanging around.

I'd recommend prototyping with the actual passive parts that are going to be provided in the kit. So, it would be helpful to have a BOM I think. I believe both you and Jacob may be working on one?

looks great Steve! The thermistors should be placed as close to the devices as you can. I wouldn't worry about the heat shrink myself, except on perhaps the thermistors. Here's how NP did it: yup, no stinking capacitors in the F5 Does this mean my package arrived?

I'd assume it is, because one can build a ground channel. 6 channel beta22 buffer FTW!

I sent something else down your way instead

serious fracking hail outside right now. golf ball sized at least!

they will return the headphone with the Koss cable. From their standpoint, it is damaged and requires repair.

Hey, I was wondering if anyone might know of other attenuation curves, other than the standard log? What I'm thinking of is something that uses multiple logarithmic slopes, but I cannot really expect this to be a novel idea on my part. I have an idea that I'm working out, but was wondering if there was anyone else that has gone down this path? My one requirement is constant input impedance My second question has to do with SMD resistors. I'm looking at the Vishay Dale TNPW and Susumu RG/RGH (due to vanishingly low tempco values), but was wondering if there were other lines out there you guys might be aware of. I'm focusing on thin film resistors at the moment (unless there is a reason I shouldn't?). My requirements are <1% accuracy and a large number of values under 1K and the ability to buy in quantities <= 10 or so. The large number of < 1K values requirement is probably the most stringent. Anyways, any recommendations here? Any other resistor lines that I should consider?

ooh looks nice!!! good job! I believe there is an error in the schematic posted at Headwize?

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wait, the resistors got hot... ya.... I mean, how hot did the heat sinks on the psu get