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On the Couch: Teac PD-H300 -> NONOZ III DAC -> PPA/Millet Hybrid -> K501/SR325
On the Desk: iBook G4 12" -> META42 w/ AD8620 -> HD330/B&O Form2
On the Move: iPod Nano 8GB -> EX70/ER-6
In progress: M3, Zen, JLH and a new DAC (and more...)
Indeed, that volume knob is pretty slicks. Some day I really want a Maxed out PIMETA or PPA. Some day.
Thanks to tangent, My first DIY cmoy. I personally preffer the 170 over 150. Im working ona new layout for 170.
oh yea, any suggestions on what I should do next?
Headphoneus Supremus: Moderator: Supafly & The Funky Pimps
Nice little amp, activemx, thanks for the pics also. How are you liking it so far?
Obligatory fine print: Welcome to Head-Fi, sorry about your wallet. Your wallet is your sole responsibility. If you have a checkbook, you ought to hide it now. And maybe cancel any credit cards you have before they hit limit.
__________________ You only live once, but if you play it right- once is enough.
Recently finished this. It's an SDS Labs MOSFET headphone amp featuring some slight modifications from the original layout:
- PCB modded for dual mono op-amps
- Some electrolytics were moved slightly to allow space for a 470 uF 16 mm one instead of a 330 uF 12.5 mm one which I couldn't find very easily.
- Lone JFET class A biasing. Although the mosfets already are "biased" to about 70 mV, the op-amp biasing was still implemented using BF245A which gives the op-amps 3.85 mA per channel at positive rail.
- PCB was changed to fit the longer and larger diameter RN60D resistors.
Component values changed compared to Sheldon's own guide:
Output mosfets are IRF9620/IRF620 P- and N-channel, and where Sheldon wanted to use 4700 uF, it has been swapped out with 1000 uF electrolytics. Four electrolytics were stepped up to 470 uF instead of 330 uF. No polyester caps in signal path, only 2x Wima 1.0uF MKS4 series for de-coupling to ground (in PS section), polycarbonate caps from Evox Rifa, also 1.0 uF were used in signal path.
Contributor Headphoneus Supremus: Top Mall-Fi poster. The "T" in META42. Member of the Trade
Since my last pics, I replaced the dime reflector with one that fits over the top of the LED and modified a compact camera bag to hold all of it:
The LED reflector is a crimp-on stud used on costumes. (Kind of like a convex chrome sequin without the facets.) It fits 5mm LEDs directly, just a dab of rubber-cement and you're done! I've seen these before in craft stores, so they're probably kind of common.
There's the stuff in the bag. I've added extra padding made of black terry cloth towels, folded over and sewed into pads.
The belt loop on the back is exactly the right size to hold the small neoprene Etymotic ER-4 bag.
__________________
"Give a man a fish and he eats for a day. Teach a man to fish and he knows what tackle to buy."
Nice little amp, activemx, thanks for the pics also. How are you liking it so far?
Obligatory fine print: Welcome to Head-Fi, sorry about your wallet. Your wallet is your sole responsibility. If you have a checkbook, you ought to hide it now. And maybe cancel any credit cards you have before they hit limit.
I am really enjoying it. I cant wait to move on to my next project.
Linear Mode
