Wardsweb Posted June 5, 2006 Share Posted June 5, 2006 Sorry to dredge up some discussion from last year but would someone mind bring me up to speed on where to find the info for a line level version? I just built the speaker level input mini-box from parts supplied by Erik Mandaville. This got me to thinking about a line level version and much searching on the forums and the web. If I read them correctly, there is a lot of talk about the DFH article showing different versions, one being line level. Would it be as simple as replacing the speaker binding posts with some RCA inputs and changing the resistors to something like 10K? Quote Link to comment Share on other sites More sharing options...
WMcD Posted June 5, 2006 Share Posted June 5, 2006 If you look farther down the content of Technical Questions you'll see a thread labeled Dope From Hope (at least at today it is just below in relation to where we are now). Within that thread is a collection of DfH and within the collection is the DfH on the two forms of mixer boxes. Looking at the boxes, the circuitry for the center channel mix is indeed the same in both versions. There are two additions to the line level box. One is that the line level signal is passed though to output jacks to feed the flanking amps, and the second is that the pass though is though some potentiometers. You might not need these "two additions" if your amp has a line level output which is controlled by the volume control. A tape out almost always is not controlled by the volume control. Gil Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 5, 2006 Author Share Posted June 5, 2006 Thanks - I've got the line level box built. Still thinking about what value of resistors I want to try with it. Quote Link to comment Share on other sites More sharing options...
whamo Posted June 6, 2006 Share Posted June 6, 2006 That's sweet! Where did you get that case? I was wondering the same thing and searched through the archives two weeks ago and couldn't find the schematic with the proper resistor values either.I probably overlooked it. If I find it I'll let ya know. Mark Quote Link to comment Share on other sites More sharing options...
Tom Mobley Posted June 7, 2006 Share Posted June 7, 2006 27K for both versions. the circuit is basically the same for both the line level and the speaker level box except for the connectors. always seemed strange to me, but I'be built several of both, always work as designed. Nice looking little box there. is that a polished up Hammond? You don't need five RCA's? two in, three out? Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 7, 2006 Author Share Posted June 7, 2006 27K for both versions. the circuit is basically the same for both the line level and the speaker level box except for the connectors. always seemed strange to me, but I'be built several of both, always work as designed. Nice looking little box there. is that a polished up Hammond? You don't need five RCA's? two in, three out? Yes, it's just a polished Hammond box. As for connectors, I'm not building this for center channel duty like the schematic. I left off the left and right out and will be using this as a stereo to mono summing output for a powered sub. Quote Link to comment Share on other sites More sharing options...
whamo Posted June 7, 2006 Share Posted June 7, 2006 I don't know if you guys are still follwing this thread but I have a quick question. My preamp has two outputs, so could I use the same schematic and just eliminate the left and right pots,resistors and jacks or will this affect the overall impedance on my preamp. Thanx, Mark Quote Link to comment Share on other sites More sharing options...
whamo Posted June 7, 2006 Share Posted June 7, 2006 Lol, also where might one obtain a hammond box? Mark Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 7, 2006 Author Share Posted June 7, 2006 Lol, also where might one obtain a hammond box? Mark Look for a Hammond Manufacturing 1509B aluminum enclosure at places like: digikey.com mouser.com newark.com alliedelectronics.com or check distributers on Hammond's site: http://www.hammondmfg.com/dists.htm Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 7, 2006 Author Share Posted June 7, 2006 Lol, also where might one obtain a hammond box? Mark Look for a Hammond Manufacturing 1509B aluminum enclosure at places like: digikey.com mouser.com newark.com alliedelectronics.com or check distributers on Hammond's site: http://www.hammondmfg.com/dists.htm Quote Link to comment Share on other sites More sharing options...
Dflip Posted June 10, 2006 Share Posted June 10, 2006 One other considereation, given the light weight of the box, you may very well want to have a local metal shop cut you some (4-6) 1/4 - 1/2" wide steel or iron strips to add to the bottom of the case to add weight. These strips don't take up a lot of space, but they do add a nice amount of mass to the case. When the interconnects or speaker cables are added, they will tip the case since they weigh more than the case itself. You can either use thin two sided tape or some form of adhesive to attach the metal strips to the box. A local metal shop took pity on me and did the job for free using some scrap they had around the shop. Quote Link to comment Share on other sites More sharing options...
Erik Mandaville Posted June 10, 2006 Share Posted June 10, 2006 Did I forget to put the resistors in with that little kit? I was certain I threw in a couple of 27K ohm (2 watts) in there. My apologies if I didn't. Send me your address, and I'll get them today! Erik Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 10, 2006 Author Share Posted June 10, 2006 Erik the 27K O were included. I'm just looking at options from various researched sources. Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 10, 2006 Author Share Posted June 10, 2006 Here is the box wired with the 27K O resistors. Quote Link to comment Share on other sites More sharing options...
Wardsweb Posted June 10, 2006 Author Share Posted June 10, 2006 Here it is taking a stereo input and running a power sub. The way it is wired increases the resistance thereby lowering the input or in other words lowering the volume. Quote Link to comment Share on other sites More sharing options...
DRBILL Posted June 10, 2006 Share Posted June 10, 2006 When I was making these boxes for forum members I used "project boxes" from Radio Shack. They have seven of them from 3X2X1 to 8X6X3. They are black and made of one of the resins. They built up with considerable ease. Of the ten or so that I sent out, everyone commented on how "professional" they looked. I remember that they were c. $3. And there is likely a R-S within walking distance of most of us! Hope this helps. DRBILL Quote Link to comment Share on other sites More sharing options...
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