Announcement

Collapse
No announcement yet.

AR-TX DIY Group

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • AR-TX DIY Group

    Okay, be good if we helped each other. We could alert each other to sales or buyouts. We could do a group buy if it saves everyone some bucks. I know Bill Brown offered foam insulation he was able to get for free. Hipp you mentioned MDF (I don't like it but it does make a good box). So lets see what we can do to help each other.

  • #2
    Yes Bill helping each other is the plan. I really formed this group so we could have a list of people who are qualified to solder your cross over parts.

    just joking.........

    Comment


    • #3
      OK,

      So, let's start with the IRF610/IRF9610 chips we picked up guys. If you are looking for a few very simple projects with them, here are a few:

      http://diyaudioprojects.com/Solid/IR...Headphone-Amp/

      http://www.passdiy.com/pdf/brideofzen.pdf

      http://www.enjoythemusic.com/diy/1108/sstart.htm

      All of these have several qualities that will make a first time builder a happy one.

      A) low parts count! Heck, you got the IRFs for free.

      B) medium/low voltage power supplies. Nothing that will kill you.

      C) should be easy to wire since none of the components are tiny

      Personally, I think I'm leaning towards the IRF610/J310 project. Looks fun and very simple. You could even run this on a simple wall wart and add further snubbing and filtering if you choose.

      Blair

      Comment


      • #4
        The Szekeres headphone amp would be a great start. Great for anybody who will use a MP3 player in their audio system.

        The basic version only needs a resistor on the lower side (in place of lm317) I prefer the LM317 CCS. The panasonic caps I gave out are perfect for the output cap, 2-3 in parallel. The original amp has 470UF cap (IIRC). I can send some heatsinks,caps and resistors needed to everybody for this amp. I can also send you a really simple regulated supply that will also use the IRF610 mosfet. Just find a 12-15V wall wart rated for about 2-3amps. (old laptops, etc)

        The Bride of Zen would be a great project that everybody could use..... I was looking at etching a PCB this week!

        Comment


        • #5
          I have a question. When I played a couple of CDs the Los Straightjackets (surf rock) and the Ronnie Earl (blues guitar) I was very dissapointed. These are ones I listen to a lot and enjoy but they seemed dingy for lack of a better term. There seemed to be a big difference between them and the other recordings. Do you think it was the room, the recording or what?

          Comment


          • #6
            http://www.pedalpartsplus.com/
            They have enclosures and other electronic stuff not restricted to effects pedals, and they will sell you one resistor at a time if you want. It arrives quickly from Louisiana
            Thanks'

            Comment


            • #7
              The difference you heard in the CD collection could be alot of things. Source, gain, listening volume, and yes quality of recording. Some Cd's are recorded with alot less "life" in them....this has been talked about over and over. What is your audio system? (computer or CD, Preamp or not, what type of Amp or Rec?)

              Comment


              • #8
                My guess with your CD is they may be first recorded Analog and when they put them on CD they did not remaster them so you lost some of the dynamic headroom that vinyl has over digital. Hey, I actually sound like I know what I am talking about, that could be dangerous! Take a look at the recording dates and the the letter code for the type of recording. The old Genesis stuff when it was remastered changed the sound completely. I heard stuff I never heard on vinyl or on the original CDs.

                Comment


                • #9
                  Let's think about this guys.

                  He is talking about CDs he is familiar with so it is likely that something besides the CD was different.

                  Tom, I don't know what CD player you use, but the one we were using was not the best, however the rest of the music sounded fine to me for the most part even though that room was huge and pretty reflective! Most of the time we were not in the "sweet spot" which can attribute many forms of reflective coloration, etc.... There were also tubes there which many do not have even thoguh I can tell you that those two tube preamps are very clean! Overall, it was probably the room and reflections skewing your observations.

                  Blair

                  Comment


                  • #10
                    Keith,

                    I would think that this circuit could easily be built for about $25 using "normal parts". I'll lay one out on a perf board soon, so everyone can see a few pictures.

                    Blair

                    Comment


                    • #11
                      Blair,

                      I guess you are planning on building the BOZ? It looks like a fine project for me, but I will need a little help selecting the proper parts. All my little projects have ran on batteries so far. Where is a good place to get transformers? It looks like PE wants an arm and a leg for them.

                      I will be anxious to see if Steve has done one of these, or if he plans to. He seems to like the single ended class A stuff.

                      I am not sure how much sarcasm to assume about Bill and his soldering, but I will be glad to help out if the need arises.
                      Thanks'

                      Comment


                      • #12
                        Now when you guys start talking electricity I think it is bad juju. I will just keep cutting wood. If I need soemthing bad enough I'll trade a set of cabinets or speakers for them. But thanks for offering to solder. By the way thanks for wiring the stuff up in Hot Springs. I hate doing that stuff.

                        Comment


                        • #13
                          Hi Keith,

                          Actually, my interest is in the SSTART preamp since it is the simplest and the parts are cheap. You can get a tranny from most surplus stores, Mouser, or Apex Jr. Any of them will have something from 30-35v which rectifies to 42-50v. This circuit will have very little current drain. I would assume just under 150mA or so, so using 500mA-1A should be sufficient. The more the marrier since heat becomes and issue using too close of a value. Strain on a tranny can cause all kinds of weird stuff like noise (both mechnical and electrical).

                          I'm going to tinker with a good layout. Just give me a bit. I'll keep it well documented.

                          Blair

                          Comment


                          • #14
                            I am going to etch the PCB layout in the article. They are nice and have a built in regulated power supply. If I get that done, I will do a set of PCB's for everybody. I also should have all the basic parts needed. I will get back to you guys on this.

                            Comment


                            • #15
                              What type of file do you etch off of? If you can use a JPEG, I have a nice little opamp board laid out also. That is if you use the print/transfer method. I never buit my etching solution tank, etc...

                              Comment

                              Group Categories

                              Collapse

                              AR-TX DIY Group

                              About this Group

                              Persons who were at the 2010 Hot Springs DIY event. I would like to start a group, and maybe as the year goes on more people from the area can join (hope to have a larger mailing list for any future events)
                              Type: Public
                              Topics: 1
                              Comments: 96

                              Owner

                              Latest Group Topics

                              Collapse

                              There are no results that meet this criteria.

                              Working...
                              X