mwl168 Posted June 14, 2015 Report Share Posted June 14, 2015 (edited) Hi Kevin: Is it possible to make the filter and bypass capacitors also SMD? The finished board would have a really low profile and can be stacked together and still fit into a slim case. Edited June 14, 2015 by mwl168 Quote Link to comment Share on other sites More sharing options...
Luke Posted June 14, 2015 Report Share Posted June 14, 2015 Does it support TO92L? I'm wondering what the holes are by the transistors. Quote Link to comment Share on other sites More sharing options...
Aive Posted June 14, 2015 Report Share Posted June 14, 2015 SMD components are so sexy! Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 14, 2015 Report Share Posted June 14, 2015 the holes are feedthru to the other side. the to92 are not the same pinout and those holes are very tiny and masked. could do the caps as surface mount, pick a package. the pots would end up the tallest item. Quote Link to comment Share on other sites More sharing options...
mwl168 Posted June 16, 2015 Report Share Posted June 16, 2015 Did some search on Mouser. SMD film caps seem quite expensive and not that small in size. Maybe use polymer filter capacitors and stick with through-hole film bypass capacitors? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 17, 2015 Report Share Posted June 17, 2015 (edited) surface mount board finished and tested and bug free.http://gilmore.chem.northwestern.edu/dsc_0659.jpg there is one set of boards left if anyone is interested Edited June 17, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
G600 Posted June 18, 2015 Report Share Posted June 18, 2015 One set is two boards ? I'm in for a balanced dynalo. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 18, 2015 Report Share Posted June 18, 2015 last set of boards is gone. power supply up next Quote Link to comment Share on other sites More sharing options...
G600 Posted June 18, 2015 Report Share Posted June 18, 2015 (edited) Copied. I'll order the through-hole version as I still have some MPSA/MPSW Edited June 18, 2015 by G600 Quote Link to comment Share on other sites More sharing options...
MagusG Posted June 18, 2015 Report Share Posted June 18, 2015 I was awake and I missed it. There'll be another. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 18, 2015 Report Share Posted June 18, 2015 I do have 2 sets of the original boards with the mpsw parts if anyone is interested. also 2 sets of the unbal to bal boards, also with the mpsw parts. Quote Link to comment Share on other sites More sharing options...
G600 Posted June 19, 2015 Report Share Posted June 19, 2015 I am interested indeed ! Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 19, 2015 Report Share Posted June 19, 2015 for the truly insane among you (birgir really wanted this) (work in progress) http://gilmore.chem.northwestern.edu/ssdynalobalsmt.jpg 1 Quote Link to comment Share on other sites More sharing options...
Kerry Posted June 19, 2015 Report Share Posted June 19, 2015 That's exactly my kind of insanity 1 Quote Link to comment Share on other sites More sharing options...
gepardcv Posted June 20, 2015 Report Share Posted June 20, 2015 In case anyone still wants Dynalo boards, I have one set left. It's the slightly older MPSW/MPSA version that requires the simple capacitor grounding jumper fix that Kevin pointed out a couple of pages upthread. (I also have several extra protect3 boards.) Quote Link to comment Share on other sites More sharing options...
RudeWolf Posted June 20, 2015 Report Share Posted June 20, 2015 for the truly insane among you (birgir really wanted this) (work in progress) http://gilmore.chem.northwestern.edu/ssdynalobalsmt.jpg Now, we're talking! Quote Link to comment Share on other sites More sharing options...
b0bb Posted June 20, 2015 Report Share Posted June 20, 2015 for the truly insane among you (birgir really wanted this) (work in progress) http://gilmore.chem.northwestern.edu/ssdynalobalsmt.jpg Yes, please! Quote Link to comment Share on other sites More sharing options...
lkong Posted June 20, 2015 Report Share Posted June 20, 2015 (edited) I've double checked 2^3 times, Digikey delivered me 31 out of 32 20ohm vishay CMF50s. The frustration is so real. Edited June 20, 2015 by lkong Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 20, 2015 Report Share Posted June 20, 2015 I would have gone with the resistors I used for the 20 ohm, but that should work fine. pretty quick assembly. Quote Link to comment Share on other sites More sharing options...
bobkatz Posted June 22, 2015 Report Share Posted June 22, 2015 Oh, please stay away from Canare Star-Quad. Very high capacitance. The so-called advantages of the twisted starquad are offset by its disadvantages. I suggest Mogami cable designated for AES/EBU, but it's really very low capacitance balanced cable great for analog: http://www.mogamicable.com/category/bulk/dig_interface/aes_ebu/ It's very neutral, no sonic color, very wide bandwidth. The only down side of the Mogami is you have to be very fast on the soldering iron because the insulation melts very quickly. But then, good soldering technique is a badge of being a DIYer. I've got another section of Canare L4E6S ordered so I can wire up a balanced cable. Single ended it sounds pretty good with LCD2, maybe seems a bit bright. I'll need to double blind with the KSA5 to see if it's just me. I'll take your advice and swap to balanced input at some point. Switch is from ebay here: http://www.ebay.com/itm/151028998690 Jumpers? I added two for the sense right at the unit....is there one that comes off? Voltage is a little low, 13.3 is what I'm getting out of it now. I'd be in for a 4deck 10K if the price is reasonable. Quote Link to comment Share on other sites More sharing options...
Laowei Posted June 22, 2015 Report Share Posted June 22, 2015 If low capacitance is the desired parameter, look into Belden 2221 microphone and AES/EBU cable at 13pf per foot. http://www.belden.com/products/enterprisecabling/brilliance_1776_2221_microphone_cables.cfm It sounds pretty good for being fairly inexpensive. Quote Link to comment Share on other sites More sharing options...
lkong Posted June 23, 2015 Report Share Posted June 23, 2015 Ordered off board version of golden reference boards from seeedstudio 1.6mm 2oz copper Will have some extras for grab when my order gets here. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 23, 2015 Report Share Posted June 23, 2015 so you have heard of book matched veniers... well... http://gilmore.chem.northwestern.edu/dynalobal16.jpg Quote Link to comment Share on other sites More sharing options...
Kerry Posted June 24, 2015 Report Share Posted June 24, 2015 I love those boards! Thanks Quote Link to comment Share on other sites More sharing options...
b0bb Posted June 24, 2015 Report Share Posted June 24, 2015 so you have heard of book matched veniers... well... http://gilmore.chem.northwestern.edu/dynalobal16.jpg Very nice, any possibility of adding thru hole pads for the output stage emitter resistors ? I am thinking about using Vishay TX2575 Z-Foil resistors (0.15"/3.81mm leadspacing) Texas Components lists the ASM2575 SMD version but they seem to have trouble getting the substrates for the small (0805, 1206) sizes. Happened to me the last couple of times when I tried to place an order for them. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.