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- Users: kriskalish
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Copper Thickness on Radioshack's two-sided self-etch pcbs?
I tried etching the board I posted, thinking I would build the power supply and test how well it tracks, then redesign later with big polygon traces everywhere. However, long story short, I didn't reserve enough space for my heatsinks, so I couldn't assemble the board. It was also the first...- kriskalish
- Post #11
- Forum: DIY (Do-It-Yourself) Discussions
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Copper Thickness on Radioshack's two-sided self-etch pcbs?
Quote: Damn, this is kind of sad to hear. I might just build it anyway since I still have enough board left to etch a second design. If it ends up being terrible like yours I can come up with something different. Thanks for the heads up though; now it will be a lot less infuriating...- kriskalish
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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CMOY Troubleshooting - Loud Hiss
b0ng0, I didn't look at this extremely closely, but I noticed a few things: 1) You have a lot of dull grey solder joints This is indicative of a "cold solder job." Basically the solder didn't uniformly reach the proper temperature before cooling. Also it seems to me like all...- kriskalish
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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Copper Thickness on Radioshack's two-sided self-etch pcbs?
As promised, here is the initial design. Schematic It's basically the exact same thing that can be found on page 7 of the LT1033 datasheet, where it is described as a "dual tracking 3A supply." Components C1-C4 are 2200uF electrolytics. R1,R2 are 1.3ohms rated for...- kriskalish
- Post #6
- Forum: DIY (Do-It-Yourself) Discussions
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Copper Thickness on Radioshack's two-sided self-etch pcbs?
Ah, thanks for the insight guys. It actually looks like my initial guess of 65mil traces wasn't far off. With 1oz pour, and permitting only a 10 degree temperature rise necessiates traces of 55mil. Is there really any reason I shouldn't just make traces as thick as I possibly can while...- kriskalish
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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Copper Thickness on Radioshack's two-sided self-etch pcbs?
I'm trying to decide how thick to make my traces in a power supply I'm building using Radioshack's two sided PCB. The thing is, it doesn't say on the packaging what the fill weight is. Here's the product I have: http://www.radioshack.com/product/index.jsp?productId=2102495 ...- kriskalish
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- Replies: 11
- Forum: DIY (Do-It-Yourself) Discussions
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How much current can the ground sink in an LM317/LM337 bipolar supply?
Quote: Thanks! This actually makes a lot of sense; treating the caps as batteries did the trick for me. Quote: Unfortunately I'm trying to build this supply on a shoestring budget so I'm using an old Bando transformer I pulled out of an amplifier in high...- kriskalish
- Post #6
- Forum: DIY (Do-It-Yourself) Discussions
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How much current can the ground sink in an LM317/LM337 bipolar supply?
Thanks for the knowledge guys. Is it fair to say that I need to attach the signal ground in this power supply to the real earth ground then? I just don't see where excited electrons (current) would go after travelling through my headphones otherwise. It seems to me that the ground in...- kriskalish
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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How much current can the ground sink in an LM317/LM337 bipolar supply?
I guess my question is summed up by the title pretty well. I already have an LM317-based supply that I built as a kid. Long story short, it doesn't work that well and I'm going to rebuild it. It makes sense to just go for a bipolar supply since I pretty much exclusively work with audio. I...- kriskalish
- Thread
- Replies: 6
- Forum: DIY (Do-It-Yourself) Discussions
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Onboard Sound / Amp question
Quote: My motherboard audio claims the same thing. We probably even have the same audio chipset, the Realtek ALC892. I just got an external audio interface and I used it with Rightmark to measure my onboard sound and it was pretty unimpressive. The noise is about 25dB higher and the...- kriskalish
- Post #3
- Forum: Computer Audio
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What does a buffer do for the output stage of an audio amplifier?
Quote: This isn't really related, but what is the giant heatsink for? Did you bias your TPA6120 into class A? -Kris- kriskalish
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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cmoy upgrade(s)
It sounds like you have pretty much solved your noise issue so concerning where to go next: Quote: I made almost exactly this my second build. I did it on protoboard with 22 guage wires, a star ground, and miscellanesous small caps to ensure stability. I used the OPA633 instead of...- kriskalish
- Post #42
- Forum: DIY (Do-It-Yourself) Discussions
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Good discrete buffers for mobile amps
I did some real reading on the merits of real ground. I found a number of sources that suggested it was the right way to go (not just the O2 site). I even encountered some of your older posts here on head-fi which were all pretty informative. However, I still have a question about...- kriskalish
- Post #7
- Forum: DIY (Do-It-Yourself) Discussions
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Good discrete buffers for mobile amps
Quote: Thanks for the link! These designs looked like class A designs which I don't really have the juice to run. I noticed while following the links that Ti had run some benchmarks on the Millet Hybrid with the discrete buffer, the OPA551, and BUF634. It looks like the diamond...- kriskalish
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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Good discrete buffers for mobile amps
I've embarked on an amplifier design journey that is probably going to take me to something very similar to the pimeta. I'm currently thinking I want a 3 channel (active ground) design. One of the issues you seem to have to wrestle with is how to get your ground channel to sink the current...- kriskalish
- Thread
- Replies: 7
- Forum: DIY (Do-It-Yourself) Discussions
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Looking to audition some DIY headphone amps in the Sacramento area
Hey everyone, I'm just starting to get into headphones. I got a pair of HD558's for Vhristmas and I love them. I had also previously built a CMoy (with no fancy parts) and I was surprised at the immediate difference in audio quality it made for me. I'd like to upgrade to a desktop...- kriskalish
- Thread
- Replies: 0
- Forum: DIY (Do-It-Yourself) Discussions
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Using a non-isolated wall wart to power a CMoy amplifier
DC Offset: Green output channel: 8.6mV Red output channel: 4.9mV Here's a 500hz square wave played by my Samsung Galaxy Tab 10.1. The slew rate seems to be about 2.15mV/us The following is the signal observed on the amplified end of the CMoy from the same source...- kriskalish
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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Using a non-isolated wall wart to power a CMoy amplifier
I've decided to wait on ordering the linear regulator IC until I get my next big batch of parts from digikey or something similar. I was too excited to get this project started so these parts are all the radioshack special (sadface). I actually switched to a battery power supply and my audio...- kriskalish
- Post #7
- Forum: DIY (Do-It-Yourself) Discussions
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Using a non-isolated wall wart to power a CMoy amplifier
Thanks tangent and splaz I can't believe I couldn't find this on your site last night. I actually think I identified my wall warts incorrectly because I remember seeing a sentence on your site that was like "use an ohm meter to test all possible combinations of input and output pins,"...- kriskalish
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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Using a non-isolated wall wart to power a CMoy amplifier
Hey everyone, First of all, this is my first post so I'd like to just say hi to everyone. It looks like you guys have a wonderful and supportive community here, which I know is not easy with the rise of internet trolls. Second, I have a question about converting a CMoy to use wall...- kriskalish
- Thread
- Replies: 7
- Forum: DIY (Do-It-Yourself) Discussions