Tom Visser Posted January 8, 2013 Report Share Posted January 8, 2013 I get insomnia sometimes... most people take Nyquil or a shot of whiskey or something. I tend to take things apart. Here is a shot of the front housing. A top mounted mode selector with 5pin (CN701), loudspeaker wired to daughterboard with 4pin (CN703), mic gain potentiometer on 3pin (CN601), and what looks to be a ground reference using the H2n's front grill screen. Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 Here's the rear half, with a battery compartment, power regulation daughterboard, and a 6pin (CN101). Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 Pictured are a couple of accessory panels, like the battery door, a trim piece from the front, and a record button with integrated SD card cover with a 2pin (CN702). Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 The main microphone cluster consists of a pair of X-Y crossed elements and a mid-side arrangement, which can also be combined for 4-channel surround sound. X-Y is on a 4pin (CN841) and M-S on a 5pin (CN842) Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 ...the main board with attached LCD and also shown is a daughterboard that attaches to the main board via board to board jumper (J602). Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 There is a SD card reader, power / hold slide switch, a tactile menu button along with navigation joystick, output volume tactile buttons, the "remote" 2.5" jack, line output 3.5mm jack, and a mini-B type USB jack. The small surface mount DSP chip is has the text "ADC 3101 TI 15J P59C" (quite an eye test). The larger chip says "FIDELIX 250915A? 1A141? SCA1113131? 1123?" (even more of an eye test). Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 The LCD is hardwired on the panel side and has a 30pin (CN602) on the board side. Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 ...more chips, an 0511A 1122EM432?, HCU04 OAKG4 CFKL (TI), Coremagic 1141 CMS6416LAH-15EE 0841A (Korea), and the main processor looks to be a TI TMS320C55 05AZCHI2 12A5H4W G1. Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 Here is the line input daughterboard with a quad pack of opamps that say 2100 B16 JRC, which are New Japan Radio NJM2100 chips. Datasheet here... http://semicon.njr.co.jp/eng/PDF/NJM2100_E.pdf Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 ...and the last picture in the set, the reverse side of the audio daughterboard, which shows CN841 and CN842 which connect to the microphones. I can also tell that the line input goes through these opamps too. Anyone recognize the 20 pin connector? It has 2 rows of 10 pins with both edges coppered. More to come at a later date... Quote Link to comment Share on other sites More sharing options...
atheisticmystic Posted January 8, 2013 Report Share Posted January 8, 2013 But did you finally get to sleep? Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 This was two nights ago - last night was great. Kids didn't wake me up until 6:30AM. I placed an order for parts, so yeah, finally could move on with my life. Quote Link to comment Share on other sites More sharing options...
soundtrane Posted January 8, 2013 Report Share Posted January 8, 2013 Tom Visser, you da man.... wish someone did this with a Nagra Lino Quote Link to comment Share on other sites More sharing options...
Olle Sjostrom Posted January 8, 2013 Report Share Posted January 8, 2013 Whatcha gonna pimp it wiv? Quote Link to comment Share on other sites More sharing options...
OmahaAudio Posted January 8, 2013 Report Share Posted January 8, 2013 I've always been able to successfully take things apart. It's the putting-it-back-together thing that always screws me up. How about adding a couple of balanced TA3 inputs? Then you could tape it to an SD302 and have the magic "SD302D" that lots of people want. Quote Link to comment Share on other sites More sharing options...
VM Posted January 8, 2013 Report Share Posted January 8, 2013 Nice job ! Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 8, 2013 Author Report Share Posted January 8, 2013 No congratulations earned yet, all I've managed to do so far is disable my backup recorder. Anyone want to buy the accessory soft / semi-rigid case and wired remote control? Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 9, 2013 Author Report Share Posted January 9, 2013 I've always been able to successfully take things apart. It's the putting-it-back-together thing that always screws me up. How about adding a couple of balanced TA3 inputs? Then you could tape it to an SD302 and have the magic "SD302D" that lots of people want. I use the H2n as a backup recorder, and other than the odd experimentation, never use the built in mics. My little project addresses this fact, that I never use the mics, and that I only use it in a bag and find the experience lacking because of the form factor designed for handheld operation. I also find the unbalanced stereo input fine, as my source is most always an unbalanced tape output from a quality mixer. Balanced wouldn't really help me since interconnects are short. Of course I'm eyeing those 4 crappy little dual opamps and thinking of what I could do down the road with them, but that is not my immediate concern. Quote Link to comment Share on other sites More sharing options...
soundmanjohn Posted January 9, 2013 Report Share Posted January 9, 2013 In the original H2, there was some quite severe EQ going on for the on-board mics, which meant that you couldn't just strip the mics out and put something else in without having a compensating EQ curve somewhere in your processing chain. I think I have a graphic somewhere that gives an idea of what was applied. You might want to do a quick check at some point if that's what's in your plan. John Quote Link to comment Share on other sites More sharing options...
soundmanjohn Posted January 10, 2013 Report Share Posted January 10, 2013 Found the picture of the EQ curve. Ignore the red and blue traces; the yellow trace shows the LF boost and slight HF roll-off that's applied to the capsules in the H2. The tilts happen either side of 1 kHz Regards, John Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 10, 2013 Author Report Share Posted January 10, 2013 Hey John, thanks for that graph. That graph represents the response of the capsules? I'm not quite sure what I'm looking at, since it doesn't look like a microphone response chart - way too linear... or did someone hook up a signal generator directly to / in place of the capsule leads and measure the electronic tilt? Some parts arrived from Mouser... Quote Link to comment Share on other sites More sharing options...
Tim M Posted January 11, 2013 Report Share Posted January 11, 2013 Although definitely not perfect I followed this guys plan and pimped mine out too. I turned it into a four track recorder the two switches let me choose between using the onboard mics and the the RCA inputs. It didn't turn out perfect but if I was in a CRAZY NUTTY Pinch I would probably pull it out and find someway to get it to work...maybe comparable to the Edirol R-44 lol. Quote Link to comment Share on other sites More sharing options...
soundmanjohn Posted January 11, 2013 Report Share Posted January 11, 2013 Sorry, yes. I should have explained: it's a sig-gen into the mic inputs with the capsules removed. John Further clarification: I had one of my H2s modified by a colleague to accept the input from one of Len Moskowitz's Core-Sound TetraMics so that I could have a pocketable Ambisonic recording system. The mic capsules are removed and a multi-pin connector fitted to the top of the case. First recordings indicated this LF boost and a test by another colleague confirmed that there's inbuilt EQ correction for the existing capsules. Quote Link to comment Share on other sites More sharing options...
johnpaul215 Posted January 11, 2013 Report Share Posted January 11, 2013 Tom- do you have a modification goal, or is this exploratory surgery? Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted January 11, 2013 Author Report Share Posted January 11, 2013 My first goal is simply to make this a quality in-the-bag backup recorder, mostly from a form factor perspective. When I say in the bag backup, I mean for ENG rigs that would otherwise be camera only mix, not as a backup for a recorder which already has a 2nd media option. The thought had occurred to me to make electronic mods, to add real quality preamps, but that would make it more expensive and at that point would like just purchase one of the usual suspects pro solutions. As a 1-off prototype, so far the cost, including the original H2n unit, is about $550. The metalwork should be ready to show off sometime next week. Anyone have a favorite PCB design suite, prefer something that would run on OS X, although windows would work too - something easy, and can tie directly into an online ordering program. I have Pad2Pad and ExpressPCB installed on my windows machine, just haven't ever actually ordered anything from them. Quote Link to comment Share on other sites More sharing options...
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