Go to: http://members.shaw.ca/roma/ and search for 'dual tracking regulator'.

http://www.crankorgan.com/millpcb.htm

Any eutectic Pb/Sn 37/63 solder with rosin core is all you need. Ersin and Kester come to mind although I don't know if Ersin is mfgd any more. IMO, anything else more exotic/expensive is audio snakeoil wrt sonic or electrical performance.

Quote: WoW! I'm no audio expert but does this mean that the Shuffle works best? What Machrone is basically saying is that the audio output stage - where the rubber meets the road, so to speak - of the Shuffle does a superior job of delivering - to the headphones - the most faithful...

The April 12 2005 edition of PC Magazine has an interesting article by Bill Machrone where he compares the audio performance of the Ipod Shuffle, Mini and 3g along with the Dell DJ20 and Creative Zen Micro. He ran a number of tests including a square wave response and found that the Ipod...

Pre-tin each connection to be soldered, then do final assembly. Now you need only enough heat to melt the solder instead of heating up both component parts, plus the solder.

Quote: 24v elpac regulated a good psu? i have that on my pimeta. i assume it would work well with the ppa untill i decide to build a dedicated one. I have no experience with this PS but as long as it provides sufficient current it should be fine.

IMO, the most cost effective 'options' are to max out the buffer configuration and the power rail isolation JFETs (Q3). These have far more effect on the quality of the output signal than exotic wiring, shiny knobs, flashy LEDs, sexy cases etc. You can get by with a modest power supply -...

Received my two boards today - as in the amp boards, beautifully executed and timely delivery. Thanks again for your selfless efforts in running this GB!

I'll take two. PM sent to confirm and with Paypal info. Thanks again for doing the legwork.

If you have a small board that you can pick up, heat up the offending hole and rap it gently on a piece of cardboard. The mechanical shock will generally cause the liquid solder to clear the hole (check for stray solder; if you have a very tight board with a lot of traces, you may want to pass...

25 packs of 25 boards + 1 pack of 15 boards = 640? WOW.

http://www.newfoam.com/kits.asp tho I have not used them, it's a starting point.

Quote: If I'm not understanding wrong, are you saying that I could probably save a few power reservoir capacitors (C1) in PPA Regardless of the quality of the Acopian, you should build your PPA with the recommended rail capacitance. Some folks really like to load up on capacitance...

The Acopian is really overkill for the PPA if you build it with the full complement of rail splitters and capacitors. This is where the real work of power regulation and filtering take place and IMO you should not skimp. As long as the power supply can produce a regulated voltage with...

Quote: According to the PPA schematic, the PPA needs a V+/V- power supply, but the STEPS outputs only Voltage and Ground. What gives? The PPA includes rail splitting circuitry on the board. The input from the external power supply is indeed only a single ended positive supply.

IMO, the only consideration about socket quality is whether you intend to do frequent op-amp rolling. In that case, a quality machined socket will ensure that the contacts will not wear out from frequent removal and insertion. Other than that, pretty much any socket sold today is of adequate...

While I have no immediate plans to build, I'll take 4 just for the heck of it.

Elpac makes linear regulated 'wallwarts'. Mouser has them.

Quote: For "maxed out" doesn't really mean anything if even a "basic PPA" is "maxed out." Some people would only regard a PPA as being 'maxed out' if it uses premium components, exotic internal wiring and precision stepped attenuator. I prefer a price-performance optimized...

Just spend some time at Tangent's and Morsel's sites on the PPA. You'd be best served if this is your first go at the PPA to stay with the stock configuration - especially with the choice of buffers. The use of discrete buffers like the Glassman implementation of the Jung diamond design adds...

The pair on your first photo looks like it shares a common pad. The pair on your second photo looks like one pin has a contact on the board; the other pin would be floating so is tied to its neighbor. I'm pretty sure these connections are intentional, if not essential and if the Toshiba is...

Try this link: http://www.ee.surrey.ac.uk/Workshop/advice/coils/#cor

Quote: 4)Lock it to the bottom of the case such that the whole case is your heatsink. Wouldn't you want to consider NOT anchoring the board tightly due to the thermal expansion and contraction of the heatsink/angle assembly? This might lead to fatigue and failure of the output...