Quote: Originally Posted by regal I doubt the transfo is the source of the buzz, mine is as close and silent. It is dead silent in the second picture. Only when I mount it on top (the transformer goes inside the black enclosure in the first pic) it buzzes.

WIP: Probably should have gone with a bigger case so I can put the toroid way back. Its enclosure is better at shielding EM than the perforated steel, but it does not cover the bottom of the transformer. Now I have to find some mu metal or something to solve the nasty buzz.

Quote: Originally Posted by stringgz301 Hi all. I'm trying to source parts for a SOHAII and everyone seems to be out of the MC7815 and MC7915 regulators. Mouser, Newark, and Digikey are all out. Are you guys hording them? Any suggestions where to find some? Thanks in advance...

It is really easy to have your probes slip and short R6 and Q4 on the left channel. Found out I fried the trimpot when there is no voltage across R6, and the fried trimpot measured in the megaohms.

My SOHA II lives! I accidentally shorted R6 and Q4, smoked the trimpot. Good thing I have a 500R one. +/-18V LV supply, 90V B+, 7mA tail current, using BD137 output transistor.

I will be using perforated sheet metal as the top plate: Amazon.com: Perforated Cold Rolled Steel 12" x 12" Sheet, .060" Thick, 0.078" Round Perfs on 0.125" Centers: Industrial & Scientific $7.68 free shipping. Its not stainless steel though, so I'll have to paint it.

Quote: Originally Posted by tuna320 Having a little problem getting any kind of readout on PB+ test point. I have hooked up everything except the jumpers and am getting a reading of 18.6 volts on the screws holding the yellow and black wires coming into the board. My led on the tubes...

Oh that is what R3P is for. I probably should use 5W 22-33R instead.

Thanks for pointing out holland's post. But with the 2.5x CW multiplier, I should still get a B+ of 98V. I'll get one anyway since its real cheap. Edit: Wait, at 14V the LV supply would fall out of regulation. I could use their 20-0-20 instead, secondaries drop to 19.7V at 0.9A load...

It is mentioned that Antek uses unloaded voltage on its labels. Anyone using Antek transformers? 14.5V (50VA) secondaries at 1.6A load still seems fine.

Home (Audio Society of Minnesota) Nothing much on headphones, but their March 16th meeting is about computer audio.

Quote: Originally Posted by HeyItsBattleKid Well there's one! And just as a note to myself, did you find this thread by looking under the Local/Regional Meet section or via the link in my signature? I'm just thinking that there may be plenty of others interested, they just haven't taken...

I'm on board!

Oh dear I missed this by two weeks... I am a new student at UofM. Came from Malaysia with my HD580 and some nice stuff. Also know a classmate with K702 and headroom amp + dac. Here's hoping for another meet soon

Quote: Originally Posted by fordgtlover What size is that capacitor? It look huge. 25V 1800uF, though supply never exceeds 6V.

Quote: Originally Posted by TzeYang XD A challenger appears: Some old cmoy i built for a user on my local forums. ( i think i posted this picture before lol ) CMOY with OPA2227 + TLE2426 + Trickle Charger + LM7812 Regulator. You should try the AD8616. With 150mA output...

Thanks for the kind comments Quote: Originally Posted by Alcaudon Where did you get those jacks??? I got them Kobiconns from Mouser, part number 161-7300-EX Farnell has them too: 1267396 One of tangent's recommendations for 3.5mm sockets.

Hay guys I just got this AD8616 CMoy done: 1455C801

Quote: Originally Posted by ClieOS There used to be an Orpheus system in Jaben's secret audition room next door, I wonder if Uncle Wilson sold it or not... Not many get a chance to see it anyway. Its actually some rich guy who wanted ordinary people to be able to have a go at it.

Quote: Originally Posted by utilisateur Interesting , what newspaper is that? Straits Times

Wah Uncle Wilson masuk paper!

Quote: Originally Posted by MisterX You can always just connect a jumper from the "AV+" to "5V" pad and run it without that regulator. The difference is not a lot. I add the 22uH inductor. Don't know if there is any difference. Just put it there to make me feel better. BTW...

I see Twisted Pear offering the PCB. Is it possible for me to get my grubby hands on the PIC hex code and BoM/stuffing guide? And where can I get the ES9008?

Practicality aside, I am amazed at the OP's courage in tackling the b22 as a beginner. There was a time when the CMoy intimidated me. Now, I can put together a PPAv2 in 2 days with no complications . Audio DIY involves expensive components and rare stuff you have to wait for weeks to get it...

Quote: Originally Posted by rds haha oh yeah... Still what are those output resistors? (the blue ones ). I used vishay 5% 1 W as I couldn't find any 1% 1W at 2.2 ohms. Generic 1% 1W 4.7 ohms