Page 15 of 16 FirstFirst ... 10 11 12 13 14 15 16 LastLast
Results 351 to 375 of 379
  1. #351
    Join Date
    Jan 2009
    Location
    907
    Posts
    13,380
    Quote Originally Posted by basinbeater View Post
    As far as eq and room compensation setup goes, If you have pretty good speaker placement for your space and not a lot of acoustic room issues, you should be able to run with a minimum of eq added in. A properly designed amplifier (as well as other pieces in the signal chain) should have a pretty flat response curve from 20hz to 20 or 30khz, as that is basically the range of human audible frequencies. With good room acoustics, speaker placement and properly designed gear, minimum eq should be needed, and can best be eliminated. Any unnecessary analog to digital and back to analog conversion should be avoided, (so no dsp) and removing tone control pots extra tone control circutiry and sliders (slider graphic equalizers) should also be removed if possible. They are all possible sources of distortion and signal degradation, again quality of circuit design and quality of execution matter.

    sent from Utah.

    Quote Originally Posted by basinbeater View Post
    Levinson makes a $15k transistor amplifier.

    sent from Utah.


    I have a buddy who got "a flat response curve" for $37. Why spend $15k? Does it sound like a nice tube amp, or something?

  2. #352
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Good question. Flat response curve is one thing. Detail, speed, dynamics, distortion, build quality are another. I'm a big proponent of not shelling out big bucks if I don't have to. So it makes me happy to know that tmy home brew amp compares favorably to other units costing much more. Ultimately sound is subjective, and if what sounds good to you is a $37 amp, then that's great. I can guarantee you the fancy tubes from the Mac won't sound as good in the monoprice amp.
    Can't even buy decent caps for a powerful amp for $37.

    sent from Utah.
    sigless.

  3. #353
    Join Date
    Mar 2006
    Location
    The bottom of LCC
    Posts
    5,751
    Iíve almost knocked on your door a few times basinbeater, been hoping to catch you in the front yard after a bike ride one of these days so we could talk audio, land cruisers and bmws, seems like weíve got a bunch in common.

    Click image for larger version. 

Name:	IMG_5159.jpg 
Views:	38 
Size:	918.8 KB 
ID:	376764

    Last winter when I was back east visiting my parents I was telling my Dad how I had gotten into audio and vinyl and he started digging around and giving me stuff he had left over from his past. He gave me a small box of cartridges. I was super bummed because I couldnít find them when I got back from that trip. Fast forward 6 months and Iím packing to go home again to visit and I heard something jingling around in my luggage.

    There was 3 cartridges but I think this one was the only one worth messing with. Itís a Stanton 680EE aka a Pickering XV-15. They seem to have quite a following and are compared to some of the high end Shure cartridges from back in the day. I picked up a new stylus for it and just got it hooked up.

    Holy fucking lush! Super warm but also still very detailed. This is the best my setup has ever sounded. Thanks Dad.

  4. #354
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Sweet find! Yeah stop by anytime. I'm around most evening unless we are at the pool. Happy to shoot the shit and listen to a couple of tunes. I need to get back out on the bike. It's been over a week.

    sent from Utah.
    sigless.

  5. #355
    Join Date
    Oct 2006
    Location
    Bellevue
    Posts
    6,623
    Holy fuck. I'm glad I don't plan on touching anything of this scale. It's a whole different world.

    Popping a 5k amp fuse. You can watch at 2x without missing much.

  6. #356
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Yeah that is sketchy as hell. I like the way they jam a bunch of steel wool and go, let's see what happens now...

    Got my gb150d buttoned up and moved into the office where it is playing through some Polk rt25 speakers. This is normally where the nakamichi sr4a sits, so it will be interesting to see how this does here for a while.
    Click image for larger version. 

Name:	1623423824793.jpeg 
Views:	32 
Size:	59.0 KB 
ID:	376936

    sent from Utah.
    sigless.

  7. #357
    Join Date
    Sep 2004
    Location
    LV-426
    Posts
    18,487
    Somewhere up thread there was a discussion about some kind of electrical contact cleaner spray - what was it called?

    I have a pickup selector switch on a guitar that isn't behaving...
    Quote Originally Posted by powder11 View Post
    if you have to resort to taking advice from the nitwits on this forum, then you're doomed.

  8. #358
    Join Date
    Jan 2009
    Location
    907
    Posts
    13,380

  9. #359
    Join Date
    Sep 2004
    Location
    LV-426
    Posts
    18,487
    Quote Originally Posted by highangle View Post
    That sounds right. Thanks!
    Quote Originally Posted by powder11 View Post
    if you have to resort to taking advice from the nitwits on this forum, then you're doomed.

  10. #360
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Pieces started arriving for the next amplifier build. This one is going to be a 2 channel chip amp. I had a Linn chip amp for a while that sounded really nice, so I figured build something like that in a smaller chassis. So far the transformer has arrived, a 300va dual 25v secondary unit from AnTek, bout $50 shipped if I recall. Amplifier duties will be handled by one at tda7293 chip per channel. Should be good for 60wpc @8 ohms or so and 80 or 90 on 4 ohm speakers.

    Pcbs are on their way from china, I got the Gerber files from a diyaudio thread and ordered the boards to be made by jlcpcb. A 12.5" x 12" case will house everything with nothing but a power switch on the front. For a power supply, I'll be using my own power supply pcb design.

    I ordered enough stuff to make 5 amplifier modules, so a couple will maybe go into a bastardized dead reciever I have laying around, a cool Yamaha r2000 that has proven problematic to repair.

    The amp design is called the Xmas amp, because the guys who designed it released the design on Xmas 2020, and gave away 25 sets of boards on Xmas. The whole thread for the amp can be found here.
    https://www.diyaudio.com/forums/chip...-jhofland.html
    Name:  -1346575253-1312639837.jpeg
Views: 153
Size:  31.3 KBClick image for larger version. 

Name:	IMG_20210805_195138.jpeg 
Views:	33 
Size:	113.8 KB 
ID:	381590

    sent from Utah.
    sigless.

  11. #361
    Join Date
    Dec 2011
    Location
    PNW
    Posts
    6,031
    Are these really any good?


  12. #362
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    ^^^ I have no idea. Build some and report back.

    Boards for the chip amp just showed up, and last night I also finished up the huge Rotel rb-1090. This is the 380 watt per channel (yes at 8 ohms) flagship amp from Rotel I was working on a number of months back. It is fixed, reassembled and tested. It weighs 85lbs. It was very well reviewed back in the day, so I am interested to see how it does vs the honey badger on the big speakers. I think I'll test it a while longer on some less fancy speakers first. The newer rb-1590 is basically the same amp with a new exterior.
    Click image for larger version. 

Name:	IMG_20210806_123720.jpeg 
Views:	35 
Size:	143.7 KB 
ID:	381648Click image for larger version. 

Name:	IMG_20210806_114604.jpeg 
Views:	35 
Size:	94.7 KB 
ID:	381649Click image for larger version. 

Name:	IMG_20210806_122900.jpeg 
Views:	34 
Size:	94.5 KB 
ID:	381650

    sent from Utah.
    sigless.

  13. #363
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    I wish phone mics recorded bass well, cause this one is SOLID.
    Makes these little polks sing.
    https://youtu.be/UKfhcchlngo

    sent from Utah.
    sigless.

  14. #364
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Got the big Rotel up for sale on ksl. Come take a listen if you are interested. $100 off for maggots.
    Listening to a little chick corea on it now. Sounds oh so nice. In SLC.Click image for larger version. 

Name:	IMG_20210810_230716.jpeg 
Views:	45 
Size:	56.8 KB 
ID:	382028

    sent from Utah.
    sigless.

  15. #365
    Join Date
    Mar 2006
    Location
    The bottom of LCC
    Posts
    5,751
    Click image for larger version. 

Name:	IMG_5476.jpg 
Views:	41 
Size:	1.57 MB 
ID:	382668

    Not musically related but they will keep my beer cold.

    Building a DIY lithium iron phosphate battery for my new camper setup. 100 amp hour for less than half the price of a Battle Born.

  16. #366
    Join Date
    Oct 2005
    Location
    Tahoe-ish
    Posts
    1,707
    Quote Originally Posted by dfinn View Post
    Click image for larger version. 

Name:	IMG_5476.jpg 
Views:	41 
Size:	1.57 MB 
ID:	382668

    Not musically related but they will keep my beer cold.

    Building a DIY lithium iron phosphate battery for my new camper setup. 100 amp hour for less than half the price of a Battle Born.
    Tell us more...
    ride bikes, climb, ski, travel, cook, work to fund former, repeat.

  17. #367
    Join Date
    Mar 2006
    Location
    The bottom of LCC
    Posts
    5,751
    I like to camp. I do it frequently and sometimes for a couple of weeks or more at a time since I can work remote. The battery setup on my current truck is sub par. I recently added some portable solar panels and this has helped but my current "house" battery is just way too small to power a fridge and charge a laptop for more than a few days. I'm in the process of building up a new truck and wanted to make sure I did it right this time with a bigger battery and more solar but I'm also really cheap. One morning I woke up and googled "DIY lithium battery" and now it looks like I'm building bombs in my basement.

    I bought 4 x 100 Amp hour cells. They are each 3.2v. When wired in serial they will create a 12v battery. I also got a BMS (battery management system) which does a few things like overcharge protection, low voltage cut off, cuts off charging in cold weather and watches the voltage of the individual cells to make sure they stay within a certain percentage voltage difference of each other. It also has bluetooth and an app that I can connect to on my phone to see current state of charge, rate of charge or discharge and keep tabs on the individual cell voltages among other things.

    Not including some new tools that I needed anyways to do all the wiring in the new truck it was about $400. You could do it cheaper with a less expensive BMS and maybe cut $100 off of that price, maybe more if you didn't mind buying from sketchy China stores on aliexpress. I bought all my stuff from US companies, it seemed less risky.

    Those cells just showed up today. I've got them wired up in parallel and I'm charging them all to a voltage of 3.65 using a power supply. Once they are at 100% full I can hook then up in serial using the BMS and start putting some 12v loads on them to do some capacity testing.

    cells:
    https://batteryhookup.com/products/n...000mah-cells-1

    BMS:
    https://store.currentconnected.com/product/jbd/

  18. #368
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    That some good shit. Makes my head start spinning, battery powered amps for Powerful portable boomboxes.

    Thea are pretty much complete tda7293 chip amps. The thread should you want to learn more is here...
    https://www.diyaudio.com/forums/chip...ml#post6488134


    Click image for larger version. 

Name:	IMG_20210819_233720.jpeg 
Views:	29 
Size:	108.5 KB 
ID:	383031

    sent from Utah.
    sigless.

  19. #369
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Damn Chinese box got delivered... To Chihuahua Mexico of all places. So... Found some heatsinks out of a dead Yamaha reciever. I know I kept the junk around for a reason. Hopefully I'll get to testing these this weekend.
    They should be fun to play around with and test different combinations of parts. I have 3 more boards, so can build different configurations. Each complete amplifier module (not including heat sink, power supply, etc) costs about $30.Click image for larger version. 

Name:	IMG_20210826_225918.jpeg 
Views:	28 
Size:	73.6 KB 
ID:	383706

    sent from Utah.
    sigless.

  20. #370
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Ye olde scrapboard amp. The case was delivered to Chihuahua Mexico. I am not in Chihuahua. So... Ye old scrapboard for now.
    It works.
    Listening impressions to come.
    Click image for larger version. 

Name:	IMG_20210827_203615.jpeg 
Views:	33 
Size:	92.6 KB 
ID:	383818Click image for larger version. 

Name:	IMG_20210827_235556.jpeg 
Views:	33 
Size:	108.3 KB 
ID:	383819

    sent from Utah.
    sigless.

  21. #371
    Join Date
    Dec 2012
    Location
    I smell poutine!!!
    Posts
    15,684
    Quote Originally Posted by basinbeater View Post
    Ye olde scrapboard amp. The case was delivered to Chihuahua Mexico. I am not in Chihuahua. So... Ye old scrapboard for now.
    It works.
    Listening impressions to come.
    Click image for larger version. 

Name:	IMG_20210827_203615.jpeg 
Views:	33 
Size:	92.6 KB 
ID:	383818Click image for larger version. 

Name:	IMG_20210827_235556.jpeg 
Views:	33 
Size:	108.3 KB 
ID:	383819

    sent from Utah.
    Awesome. The Ghetto TK421 FTW!!!

  22. #372
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Ghetto tk421 playing in the living room. Sounds pretty good with some cheapo Polk monitors (great little speakers for $20. if you get a chance to pick some up cheap, do it.) Using a nad preamp and a denon tuner. This nad preamp seems to play nicely with everything I hook it up to.

    Gonna play it in here for a while, get a real feel for this amp. The boy says it sounds good.Click image for larger version. 

Name:	IMG_20210829_102446.jpeg 
Views:	29 
Size:	109.5 KB 
ID:	383901Click image for larger version. 

Name:	IMG_20210829_102457.jpeg 
Views:	29 
Size:	99.6 KB 
ID:	383902

    sent from Utah.
    sigless.

  23. #373
    Join Date
    Dec 2012
    Location
    I smell poutine!!!
    Posts
    15,684
    Oh, I think you need all that bass!

  24. #374
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    Ha. Those little peashooters of speakers are not adequate for the room, and the amp is a lower water unit, 40 or 50 watts per channel. But for a temporary location until my case shows up, it can hang here. I think eventual resting place will be in the kitchen. I may pair a digital streaming preamp with it, who knows.
    This room already has a large speaker setup. Cause I need the bass.

    sent from Utah.
    sigless.

  25. #375
    Join Date
    Dec 2005
    Location
    Watching over the valley
    Posts
    3,790
    The next project has arrived.
    The Wolverine ef3 power amplifier. These are prototype boards, I am part of the prototype test builder group. This is the long awaited successor to the honey badger amp (of which I have built two now).
    Lots of soldering ahead.
    Click image for larger version. 

Name:	IMG_20210902_191430.jpeg 
Views:	23 
Size:	111.7 KB 
ID:	384339

    sent from Utah.
    sigless.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •