[grasshpr]

Hey guys, just wanted to share my first try at a 10k stepped attenuator. The switch is from triode.com.

Over 200 solder joints later...

 

[ScubaSteve87]

Thats nice, approx how much did it cost you to make? I am going to do alps pots in my next M3 amp unless I can get some decently cheap stepped attens

 

[grasshpr]

Quote:

Originally Posted by ScubaSteve87 Thats nice, approx how much did it cost you to make? I am going to do alps pots in my next M3 amp unless I can get some decently cheap stepped attens

Damn cheap compared with goldpoint attenuators. I spent 25 for the switch, 2 dollars for the proto boards and approximately 35 dollars for the resistors (bought resistors in bulk of course, enough to make 3 more attenuators). So about 37 dollars total for one attenuator. Now for the amp...

 

[Brian Donaldson]

Here's my first born head phone amp. It is loosly based on this http://headwize.com/projects/showfil...ammer2_prj.htm But different tubes voltages and power supply and ...well, it's a long tailed pair driving 4 paralleled cethode followers. Sounds great. Gain is about 4 and drives my Sennheiser HD570's to tears. I'm also including RCA outs for use as a preamp.

On to the pics

First is self evident
Second is the bottom view of the circuit board. I used the laser printer transparency iron on method
Third is a close up of the front. I have seperate heater, B+,mute switches, Then Input select, crossfade, volume (all left to right)
And of course, the glowing view. The switches are in polished copper, and the knobs mounted in sanded plexiglass back lit with red LEDs. I'm also waiting for a piece of glass to mount under the top plate that will hang out over the tubes and be edgelit with red LEDs.

I need to draw up the schematic to share and learn how to link images.

 

[n_maher]

Quote:

Originally Posted by Brian Donaldson Here's my first born head phone amp.

That's some mighty fine looking work you've done there Brian!

Nate

 

[Blooze]

Finally finished my Millett tonight! Got the knobs in the mail today which were the finishing touch. The top is zebrawood and polished aluminum, while the box is bamboo. Hope ya'll like it!

 

[The Monkey]

Blooze, all I can say is, "wow!" Beautiful work.

 

[The Monkey]

A couple of cmoys I built for the stockings this Christmas:

 

[ScubaSteve87]

Millet has been done for a while, but just haven't got around to posting pics.....

Its my first DIY amp and it turned out great, but I also messed up quite a bit

a few notes: The top was not ment to be raw aluminum....the dremel slipped....so I was forced to make a design change

The 1/4 jack and pot are down a little from center, because I have a tread kit inside the case up against the right side

I also accidentaly switched the front and back panels around on the hammond....they should be switched

Its got Cerafines in the C2 postion, white LED's under the tubes. Ihave 12fk6's in there right now, I prefer there larger sound stage and more laid back vocals to the 12AE6. Well thats about it....next up is a modified linkwitz crossfeed and an M^3 hopefully in 3-6 months

 

[The Monkey]

Very cool, Scubasteve. What power switch is that? I like it.

 

[ScubaSteve87]

http://www.mouser.com/index.cfm?hand..._pcodeid=54002

that one on Mouser

 

[ericj]

This is my first take on Sijosae's iHybrid Nano - in an Altoid Sours tin.

It's not a bad little amp. His suggested 100k trimpot may be too low of a value. I ended up settling on a Philips NE5532 for the opamp. jrc4580 and opa2111 also sounded pretty good.

Sorry, no obligatory glowey picture. The 6111 is barely two dots of red in the dark anyway, and since it's inside the tin i made no effort to illuminate it.

Perfboard is from some one-horse outfit called Measure Explorer. It's very good pcb material and has a masked groundplane.

Also slightly proud of my wallwart hack. $2 thrift store 12vdc 500ma wart, replaced original 470uf cap with a 1000uf cap, 1n4001 diodes with 1n5817, added snubbers (possibly not needed with schotts), and bolted in an LDO 12v regulator.

Regulator is a Sanken SI-3122V. TO-3P formfactor, it's rated at 2 amps with a minimum voltage drop of 1 volt. It's performing very well. Unlike a 7812 or lm317, when it's only asked for 350ma it doesn't get hot enough to require a heatsink. Plus since the legs are fairly far apart, it was very easy to solder the protection diode and input and output caps directly. The package also electrically insulates the bolt that fixes it to the inside of the wallwart.

The datasheet called for "approximately .33uf" of ceramic caps between input and ground to prevent oscillation. I don't have any .33uf ceramics and the .33uf film caps i have are enormous, so i used approximately three .1uf discs. Ugly, but it works.

This amp runs fairly hot. the heatsink on the 7806 gets up to about 65c.

 

[Blooze]

Here is a crossfeed a'la the Meier Corda Cross. All carbon films and the knobs on the front are recessed into the panel.

 

[Dvenosa]

Well..... I have been thinking about a crossfeed filter design for a long time.

The years have passed and I continued to develop my studies about it...

I had too greatest inspirations Alexander Calder circus and Jason's friday 13th....and NOW I'am gonna show you guys the results!!!
(not for the faint hearted)

Functionalaty+design+modern art+design+portability = Ven/kwitz Filter

now i consider myself a master diy builder heheheheh

It's a Meier Bass Enhanced Crossfeed made with the parts I had here....I made it just to spend my night doing something, kind of a therapy....look at the output ( its a cheap phone directely soldered)

 

[jbloudg20]

Quote:

Originally Posted by Dvenosa Well..... I have been thinking about a crossfeed filter design for a long time. The years have passed and I continued to develop my studies about it... I had too greatest inspirations Alexander Calder circus and Jason's friday 13th....and NOW I'am gonna show you guys the results!!! (not for the faint hearted) Functionalaty+design+modern art+design+portability = Ven/kwitz Filter now i consider myself a master diy builder heheheheh It's a Meier Bass Enhanced Crossfeed made with the parts I had here....I made it just to spend my night doing something, kind of a therapy....look at the output ( its a cheap phone directely soldered)

Its a work of art!