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TREAD outputs 1/2 expected voltage
All capacitors are in correctly. I put the supply on an oscilloscope to diagnose and found a strange waveform coming through the regulator, which also caused the regulator to heat up markedly. This same waveform was being injected back into the transformer. The transformer smoked before I...- zenon
- Post #7
- Forum: DIY (Do-It-Yourself) Discussions
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TREAD outputs 1/2 expected voltage
These are my test results: P1 - P2 DC: 11.5 AC: 0 P2 - P3 DC: 19.25 AC: 41.7 I reviewed the schematic and realize that P1-P2 doesn't measure what I initially thought it did. But the P2-P3 AC component is concerning. Ideas? Attached are some photos, I don't think...- zenon
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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TREAD outputs 1/2 expected voltage
I have a TREAD that I constructed from tangent's kit. I'm using it with a with a 20VAC AC-AC wall wart. I wired it to the wallwart and began testing. I'm finding that the voltage directly off the recifier (test points 1 & 2) is approximately 11VDC. I removed the TREAD and connected to the...- zenon
- Thread
- Replies: 6
- Forum: DIY (Do-It-Yourself) Discussions
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PPA v2 construction discussion
What needs to be altered in the circuit to accommodate a set of Beyerdynamic DT 880 - 600 Ohm cans. I'm sure the gain will need to be on the high side (how high?) but, is there anything else? Thanks.- zenon
- Post #957
- Forum: DIY (Do-It-Yourself) Discussions
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192kHz S/PDIF output - suggestions?
My PPAv2 is almost complete, now it's time to rebuild my digital signal path! Please offer me your advice and suggestions. I'm looking at the Zhaolu D3 DAC - Comments/Suggestions? My search for a digital source for the D3 has presently yielded two contenders, please offer...- zenon
- Thread
- Replies: 0
- Forum: Computer Audio
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PPA v2 construction discussion
It is mentioned here that "The PPA board will accept one to four buffers per output channel", is this referring to Q24/Q34 on the PPA v2.0e? How is this accomplished??? I bought a bag full of BD139/BD140 transistors and am thinking about using perf-board to make break-out panels. Thanks!- zenon
- Post #945
- Forum: DIY (Do-It-Yourself) Discussions
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HOWTO: SRC Best Sinc Resampler Ubuntu 9.10 (noob friendly)
If you want to take this to the next level, compile a real-time kernel, install jack sound server and jack-rack. Or do what I did and install ubuntu studio. Home | Ubuntu Studio Info on setting up jack: Follow from the top but ignore the jack plumbing deal, it didn't work for me and I...- zenon
- Post #7
- Forum: Computer Audio
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PPA Bass Boost Circuit - HD800 Component Value Sanity Check
Per your suggestions I have dialed in the following setup: HD800 R3=1k R4=7k R7=7k C7=0.51uF Denon AH-D1001K R3=1k R4=7k R7=17k C7=0.51uF R7 will be variably changed with a pot. Would these values of R7 and C7 cause any issues with the circuit? Thanks.- zenon
- Post #4
- Forum: Headphone Amps (full-size)
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PPA Bass Boost Circuit - HD800 Component Value Sanity Check
The uploading process resized the images into blobs. Here are the component values: Denon R3: 20k R4: 15k R7: 80k C7: 0.1uF HD800 R3: 20k R4: 15k R7: 30k C7: 0.1uF- zenon
- Post #2
- Forum: Headphone Amps (full-size)
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PPA Bass Boost Circuit - HD800 Component Value Sanity Check
I am currently planning/ordering parts for a PPA v2 build with bass boost and am requesting advice on component values. I played around with tangent's online component calculator and found that I could tailor the boost curve for both an HD800 and my pair of sealed "airplane" cans by only...- zenon
- Thread
- Replies: 3
- Forum: Headphone Amps (full-size)
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How to equalize your headphones: A Tutorial
AMAZING! kudos! I just finished one round of sine gen. This equalization will be EXTREMELY effective, it's unbelievable actually. Now, was I the only one who heard the 24kHz tone? ;-)- zenon
- Post #398
- Forum: Headphones (full-size)
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Linux digital output
Yea that should be fine. Also run the analog and digital rails of the DAC off independent power supplies if possible.- zenon
- Post #7
- Forum: Computer Audio
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M-Audio MobilePre - signal path upgrades
I have cracked open my MobilePre and want to plan out some upgrades. My setup is ubuntu-studio Linux running jack realtime sound server, M-Audio MobilePre, and cmoy (OPA2227) headphone amplifier. Headphone Amp Attached is what I believe to be the headphone preamp. JRC : 3414A = Believed...- zenon
- Thread
- Replies: 1
- Forum: DIY (Do-It-Yourself) Discussions
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Linux digital output
Computers are electrically "noisy" if you isolate the DAC - using fiber optics - the power supply on the analog side of the DAC has a snowballs chance in hell of being clean.- zenon
- Post #5
- Forum: Computer Audio
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M-Audio MobilePre - signal path upgrades
I have cracked open my MobilePre and want to plan out some upgrades. My setup is ubuntu-studio Linux running jack realtime sound server, M-Audio MobilePre, and cmoy (OPA2227) headphone amplifier. Headphone Amp Attached is what I believe to be the headphone preamp. JRC : 3414A = Believed...- zenon
- Thread
- Replies: 2
- Forum: Computer Audio
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Linux digital output
Are you using the jack sound system? My preference would (will) be to decouple the computer from the DAC fiber optically.- zenon
- Post #3
- Forum: Computer Audio