What do you guys think about an AMB M3 amp + y1 DAC combo? Power from a wall wart transformer? No tubes but a good amp none the less?

So a new title at work and a new cubicle office later I no longer can listen to music without headphones at work. + I'd like another DIY-project like NOW!   What headphone amp you guys recommend? Preferences: - Not portable but smallish - PCB's readily available - I don't have the equipment...

Hi!   I'm looking for a new headset, that could accompany me while cycling, running, hiking and going to the gym. Heres what I'm looking for: A headset that fits my ear, i.e. not fall off whilst for example jogging. An on-cable microphone is a must. They don't necessarily need to be...

Okay, if you'll look at the service manual link I posted before, on page 11 it shows the wiring diagram for the power cord. There's a resistor R8, which connects the power cord to the chassis. There's also a metal screwable stud on the rear panel of the reciever with the text GND above it.  ...

Hey guys, it's been a qhile since I posted here - been busy building a motorcycle for the past year.   A friend dropped his vintage Harman Kardon 330c stereo solid state reciever and asked me if I could modernize the thing a bit. What he was most concerned about was that the powercord does...

Some more info on the alternator:   Alternator capacity: 12V, 170W/5000rpm Regulator/rectifier: Type: Transistorized, non adjustable Regulated voltage: 14-15V Charging current: Charging start rpm: 1000-1200rpm At idle: (+) 8A/Above 14V (light OFF) At 3000rpm: (+) 12,5A/14-15V...

Hey all, long time since I've posted here! My M3's are still rocking hard and I love them. Since then I took on a different kind of a project.   I'm building a café racer -inspired motorcycle from an -86 Honda XBR. You can read about the build here if youre interested...

Quote: Originally Posted by spritzer This is my new KGSS desktop amp, codenamed "bomb shelter" by some of our members. The PCB's are from Headamp and the amp is bone stock with a 4-gang RK27 pot which will be replaced with a 4-gang TKD 2508 once my custom order arrives. The chassis I...

I had a hard time finding out their english name too, since I'm finnish But after a quick googling session I think they're called "nut rivets" or "popnuts" check it out

My caseworks have always been built from sheetmetal (nowadays I preffer aluminum sheetmetal) Folding from sheetmetal usually makes things complicated, since most of the folding machines set geometrical restrainst to what you can do (ie. at least my workshops folders can't fold four walls...

I'm using my multimedia-PC as my only source of music (+movies etc.), and right now, my setup is soundcard analog out --> M^3 --> speakers. Now, for example, if I'm watching a movie through the PC, I can adjust volume level of the movie from the player's (VLC, Windows media etc.) volume...

Thank you all for your kind comments! This was my first true DIY project (meaning apart from the PCB's, connectors and components - everything is handmade), and I'm pretty happy with the way it turned out! I must say I'm hooked, and I already have a few ideas in my head for the next project

Regarding the original topic : A quick review of my now finished amp. As explained earlier on this thread, my goal was to build a longlasting, maintainable, modifiable, high-quality stereo amp to act as an amplifier to my multimedia PC. This PC is used for listening music, making music...

Pictures (only of the σ11, the M³ is still undergoing some changes): I'm going to chance the outer screws with cooler ones, as soon as I get them from a friend. Front panel, I really like the "heavy" toggle swich (goes well with the overall look) but the LED is still a little too...

Quote: What value and type of fuse are you running, and what is the total VA of all your transformers? I used a fast 2,5A AC mains fuse (am planning on putting a smaller one there), and the trafo is 100VA (I have separate fuses for left and right channels) I'll go over the initial...

I got a chance to get a first listen on the amp, I'm really pleased with it's output volume levels, and overall ambience of the sound. I'll haveto do a more thorough listen when I get decent speaker cables and a clean source. Problems: The right channel burnt a fuse right after I boxed it. I...

AMB, you're a true gem! I'm ashamed to confess that I accidentally had placed a 10kohm resistor as R6, whereas it should be 1kohm ... I've noted in my parts list that R6=10kohm, so I somehow got it wrong from the beginning. Well, there are new resistors in place now, and I'm getting the...

Quote: Originally Posted by amb Check to make sure you used the correct value resistors for R6 and R7. Other than that, I think you simply need to turn the trimpot some more. Something would be wrong if you reached the end of the trimpot's travel and still cannot get any voltage across...

Quote: Are the MOSFETs getting warm? No. Quote: Make sure you didn't install the wrong value trimpots. All the BIASOP trimpots should be 1K ohm (probably marked as "102") and the BIAS trimpots should be 5K ("502"). I have this as BIASL/-R and this as BIASOPL/-R so all...

okay, onwards then.. had the chance to try a more reliable multimeter to verify my measurements.. step 3 - check step 4 - check (although it was OPAMPR, because no ground channel) step 5 - check step 6 - check step 7 - check (set the voltage over R5R to 0,45VDC) step 8 : - Measured...

Could bad/wrong volume pot's cause this? they're the only part in which I didn't use recommendations, but trusted the local electronics shop guy who said "these are cheap and will work. I've used them dozens of times"... Theyre something from this catalog

Quote: Originally Posted by amb Does step 6-9 pass completely? well.. step 1 - check step 2 (no opamps on at this point)- - got >2000kohms or 234kohms between V+ and V- depending on which probe of the multimeter is touching which terminal (nagative to V- and positive to V+ =...

I'm getting 16,8kohms between V+ and V- whenever connected to the sigma, is this ok? Tried turning the BIASR several turns (6-8) and nothing happens, I get a reading of zero volts across R9R..

MOSFET's -Check Solder joints - check (with eyesight) How do I check virtual ground? The correct component is there if that's what you mean? Installed OPAMPL and OR-IG is now about 4,5mV, but across R9R+ there's nothing..