May 28, 200917 yr It's not a matter of shame, it's a matter of having a blank four deck 42-step attenuator arriving soon Seems like an excellent use of the added steps to get more attenuation. Oh, do tell... ;-)
May 28, 200917 yr My balanced B22 have gain of 8 in SE configuration so 16 in balanced. I do not think its overkill for headphones since at normal level I still use about 12-13 clicks on 23 clicks of Goldpoint step. With K1000 could be up to 17 clicks. But with some sensitive headphones I have had audible hiss. K1000 do not hiss. CD3000 and Edt.9 have hiss. D5000 do not. The easy fixable though just by adding 75ohm to each channel. Anyway it would be nice to check different gain configurations.
May 31, 200917 yr what, matching hfe for every transistor to the same value on all four boards isn't unreasonable, is it? By the way, this amp needs some more compensation at gain of 4... at gain of 7 I didn't need any compensation. What gain do other typical four channel amps use, like the dynamight and beta22? With my Dynamite I have a gain on 10 or 11 on each board (min recommended for satbility) and I added 20db preattenuation to the pot. Works well with my K701s and a 2.0v source unbalanced or 2x2v balanced. I might drop it to 10 or 15db preattenuation when I get around to it.
June 3, 200917 yr Looks like j4cbo is ready with the board layout infos. Should be receiving the zip of the files necessary to do the order in a bit. After that I'll rock the prototype order tomorrow. Sorry for the wait folks!
June 3, 200917 yr It's all good, as long as it's done right. Should be awesome. I'm banking on it. If its any more than the Dynamite it will not leave you dissapointed. Thanks for the update. Couldn't be better timing as I set up a new workbench in a new home.
June 4, 200917 yr No.. boards are still available since we haven't ordered them yet, but if you read earlier this project may be difficult to pursue without some of the transistors that you missed out on. Talk to luvdunhill to see if he can hook you up... Either way after that conversation let me know if you still want boards.
June 4, 200917 yr Copy and paste of the prototype order thing. Went with 5 day turn around and fedex express shipping (3 day). Going to luvdunhill... so hopefully something by next next week! Product Name 2 Layer standard technology PCBs Product Category Standard Technology PCBs / Online Special Brief 2 layer Standard Technology PCBs. Please send files in Gerber RS 274X format. Material(s) FR4 Thickness .062 inches Copper Weight 1 oz outer / 1 oz inner Minimum Line Space Minimum trace/space allowed is 0.005" (0.006" is standard) Smallest Hole Minimum 0.010 inches finished hole size NOTE: Any number of drill sizes okay. Also note that MAX hole sizes: 199 mils non-plated & 246 mils plated. X dimension Y dimension 4.95 " 4.25 " Maximum Area 100 square inches SolderMask Green LPI Legend White, Component (top) side only. We charge an extra $50 for legend on both sides. Finish White Tin or Hot Air Solder Leveling (HASL), depending on availability Routing Individual, No Route & Retain. No Scoring Distance between SMT pads N/A. The SMT pitch does not matter for 2 layer boards. Number of Slots Minimum Quantity 1 Other Details We expect design to have plated holes only. $50 extra added to order total if design has non-plated holes. Your boards should AVERAGE no more than 50 holes per square inch. Restriction No Step and Repeat, no Scoring, and no Route and Retain allowed. MULTIPLE PARTS: Typically, in PCB manufacturing, we expect one part number in one image that you provide. If you have multiple parts in one image, we will route it all as one.For such multiple parts, we charge $20 per extra part on the whole order. Also note that you will have to separate the parts yourself. Example: If we see 3 parts in one image, it is (2 *$20 =)$40 extra on your order total. Restriction No gold, no cutouts or slots. Rectangular boards expected, up to 3 notches allowed. Rounded corners okay. Chamfered corners okay. See FAQ for details. NOTE: If your design is MilSpec or under ITAR regulations, do not use this online special. Instead, please send in your inquiry to [email protected] and ask for a custom quote. Payment Credit Card ONLY (Visa/ MC/Amex) Annular Ring Width 0.005" minimum width of annular ring. (In other words, pad diameter has to be 0.010" more than the hole diameter) Part number kevin gilmore dynafet Revision 1 Special notes/comments 4.95 x 4.25 File name gbf2.zip My design contains non-plated holes Optional (No) $ 0.00 Apply both top & bottom silkscreens Optional (No) $ 0.00 Design Rule Check & Netlist Testing Optional (No) $ 0.00 Shipping Option Fedex Express Saver $ 17.00 Trace/Space/Hole Related Details Minimum Trace / Space: 6" Minimum Finished Hole Size: 15" Layers = 2 Area = 21.03 Sq inch Turn Time = 5 Days Unit Price = $ 18.00 Number of Pieces = 5 Testing Price = $ 0.00 (optional) PRICE (Unit Price X Number of Pieces) $ 90.00 EXTRA CHARGES* $ 0.00 NRE (Free !) $ 0.00 TESTING (Design Rule Check & Netlist Testing) $ 0.00 SUBTOTAL $ 90.00 SHIPPING (Shipping & handling charges) $ 17.00 TOTAL (PRICE + Extra Charges + Nre + Testing + Shipping & handling) $ 107.00 * (If any Extra Charges are shown above, they are based on your selection of one or more of these options: # Make Non-plated holes # Apply Silkscreen on Both Sides )
June 4, 200917 yr Your files have been cleared and your order will go into process, the first day is 06/05/09. So if the 5 days are business days it seems like they'll mail out 6/11 or 6/12 with 3 day shipping.. luvdunhill should have them by ~ 6/15 or 6/16
June 6, 200917 yr Author Errr, M&Ms? no, nice try though think more calories... Edited June 6, 200917 yr by luvdunhill
June 6, 200917 yr Looks like a thermocouple at 59.5 deg, so you are temp testing something. Something at 30V 150mA; perhaps one of the output devices?
June 11, 200917 yr Kicking off the hifi2000 Pesante dissipante 3u/300mm group buy for those interested. Group Buy thread here: http://www.head-case.org/forums/group-buys/6477-hifi2000-chassis-3u-300mm.html#post244387 Let me know asap if you are interested. Looking to do the order in the next 1-3 weeks.
June 12, 200917 yr Boards shipped. They will be arriving at Luvdunhill's next Tuesday. PMing you with the tracking #s Marc.
June 13, 200917 yr Author Will the 4.95 x 4.25 pcb dimensions be the final size or just the proto size? final size
June 15, 200917 yr And the boards is bracket mountable, right? Looking and Jacob CAD (from chassis group buy) the boards do not have space for the bracket.
June 15, 200917 yr Those aren't the normal boards. He is doing another design that has more SMD parts and is a bit smaller and laid out to ensure we can achieve the 3u layout. The prototype boards are essentially the final boards. Unless you happen to want our version.
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