Okay first and foremost I don't live in the U.S.. My country is quite a headache when it comes to the availability of such equipments at the individual consumer level. So nothing too exotic for me. I'm not experienced enough to know my needs and I certainly do not know any person of the same...

I've been given a unit to fix but the factory seems to be non-responsive when the distributor (my friend) asked for a schematic. It'll make my work easier if I have a schematic in hand. Thanks in advance.

The 2SK170 is pretty popular these days but their price and availability is making it less attractive. I'm wondering if there are any good/even better alternatives from vishay siliconix, on semiconductor, fairchild etc (common manufacturers) that I can substitute the 2SK170 with. I'm using...

So someone sent me the above combination for some fixing and I have limited time and tools figuring out in detail what went wrong with Sigma11 given the below scenarios. Sigma11: Unloaded voltage= 24V Loaded with M3= ~24V (to show that under load that it's still within spec) Basically it...

When it hits 70-72%, you can hear a certain buzz, and once it goes over 72% there is no more buzz and after you go much higher around 85% you get the normal hiss due to high gain. Amplifier is AD825 feeding a diamond buffer, properly compensated, three channel, gain of 4, Alps RK27 properly...

Okay here's my story. My country's line is screwed up and the DNS server seemed to be very buggy for the past two weeks. I doubt it gets fixed any time soon. I cant visit mouser and add orders efficiently without getting time outs frequently. There are some parts of the Gamma1 DAC that can...

I'm sure a lot of you DIY capable folks here do sell some headphone amplifiers of various designs to some people who requested for it personally. Question is, do you miss the amplifiers you sold? Personally, I do. I even missed the tiny maxed out cmoy I sold and actually considered...

Any ideas where to source em cheap and get it shipped internationally? I'm always fond of single core wires due to it's strength and ease to work with. thanks.

Okay I was helping a friend fix his PPA V2 + STEPS (all-in-one case) I've observed some ringing noise especially if the volume pot is turned up. Because of the size constraint the Amveco Toroidal is just next to the input. Opamps used are OPA637 (Gain of 11) Ground Opamp = AD829 with...

So I built a portable amp with push pull buffers, three channel and with OPA627 L/R and AD744 GND with comp pin output. Gain is 6, potentiometer is an alps RK097 WITHOUT the switch. (regular RK097) Source PCM2702E (Neochen's miniusb) Hiss and Buzz: Appears: 1) When there is no...

Since my lecturers are too "busy" to answer me anything unrelated to my course subjects, I have no choice but to ask my questions here. HeadWize - Project: A Pure Class A Dynamic Headphone Amplifier by Kevin Gilmore I'll use the Dynalo as an example because I'm working on something...

1) Wallwart 24VDC, touches pot (buzzz) 2) 2x 9V Batteries, No noise. mind you, there is no metal/aluminum case, i tested them all naked. Do you think it's due to the noisy wallwart?

I'm having this weird problem with some noise when i touch the volume pot: They don't happen when no source is connected though (however, at max volume without anything connected, there's some ticking noise whenever i touch the pot) Case 1: Source is a PSP using headout with volume set...

In this thread, we post pictures and discuss the fun and wonders of using strips boards, perfboards, and wires point to point. There are too many people with PCB work these days, it'll be fun and refreshing to see some "real"(hassle) diy work. My work, a month ago. An adjustable diamond...

There is something wrong with my ears, I can hear ringing when i use IEMs, even open air headphones and frequently when i'm exposed to a silent surrounding. Although headphones and music are my primary hobby, but i don't listen to loud music at all. In fact, i prefer all my music to be...

I was having a dreadful time finishing my boring, pointless assignments when my father called and said, "hey I'm looking for an IEM, go find me one." "Excellent..!" I thought, so I went to Amazon and found out they were selling ER6Is at a very decent price (around 70USD). So i thought why not...

Dear DIYers and great teachers of Audio DIY, I'm about to receive those bjts and jfets for the above diamond buffers. Thing is, which of the two are much more stable for open loop no opamp configuration? Sound quality is kinda important too. The Millette hybrid diamond buffers also uses a...

I encountered a very very weird problem with the dc offset measurement with my 3 channel diamond buffers, with AD744 as ground channel opamp. No gain stage. Based off the diamond buffer design below: Problem: Situation One: -Measuring directly from the bare output wires soldered on...

I couldnt find that type of protoboard that tangent's guide suggests. I could only get the alternative stripboard. Problem is, i don't have enough knowledge to plan a working layout for a cmoy. Can anyone give me a clear picture or design layout on a stripboard? i've searched this forum...

Dear DIYers, I'm going to ask someone to build me a PIMETA so i can drive the Yamaha HP-1. Do you think the PIMETA is capable of driving the Yamaha HP-1 to decent levels? I don't have the technical background, so can anyone here please enlighten an ignorant soul? Thank You.

I know it sounds crazy, but i prefered how the VIA DAC sound over the wolfson on the AV710 with my 2.1 setup. The VIA DAC sounds warmer, tamer, smoother, but less fidelity and dynamics while the wolfson sounds pretty bright, harsh, but more detailed. Anyone feels the same way?

I'm going to change to a better dap/pmp soon. Cowon A2 seems to fit my needs and budget nicely. The capability to play flacs, decent audio quality, video (not as important) are definitely why i chose it. Now, there's one problem, can anyone tell me about the quality of the lineout? Do i have...

Regardless of file size, what's the craziest settings to encode the best quality Mp3 using lame? You see, i'm using the NW-A1000 and it does not support lossless. So i think i'll just go for the best mp3 quality until i get my hands on Cowon's A2. Thanks in advance.

Okay i admit, i screwed up two days ago. My new PPA v2 came and i didnt know which way the pot should be adjusted. Without any caution, i assumed the Max volume (anti-clockwise 100%) was Min Volume (should be the other way round but i guess i was too excited to tryout the new combo) and you...

Is Atrac Advance Lossless at 256kbps the best i can use for sony portable players? I'm looking for pure sound quality only. The device is the Sony NW-A1000. Thank you