I'm learning CADint and since I've been planning to build the Szekeres (DC version), I did a layout for it. Any suggestions for improvement?

I'm considering the Super E-caps configuration for non-polar Black Gate caps for my PPA: http://www.blackgate.jp/ebg6.htm Here are the caps I had in mind: C1: BG NX 1000uf/25V (2 needed, total) C4: BG N 33uf/16V (12 needed, total) C2, C5: BG NX HiQ 0.47uf/50V (18 needed, total) Some...

Does anybody know where I can find the EL2008? I already have two, so I only need one more for a portable PPA. Maybe somebody has one they don't use? I don't mind if it's used.

I was thinking about getting rid of the opamp(s) (or other components) in the signal path that's not needed when I don't need to amplify the signal. Has anybody tried using a buffer with a volume control instead of an amp for low impedance headphones? I have a few EL2009, would those work...

I'm planning to build a PPA with EL2009 buffers. I have two questions at the moment: 1) Are there any opamps that matches the EL2009 particularly well? 2) Which C1 caps (cost no object) will perform best for the PPA? Big capacitance Panasonics or smaller capacitance Elna/Black Gates caps...

Is it normal that the DC offset on the Gilmore dynamic is drifting? Below is graph of the DC offset from my amp. Sample time is 1 second. (For instance, at 500 seconds the dc offset is -1.0 mV.) Is my amp OK or is there something wrong here?

I'm currently looking for an oscilloscope, but I don't know much about these things. Maybe someone here could give me some advice. I found this oscilloscope on EBay. Is it a good deal? Which brands/models should I look for? And which accessories do I need? (Except manual/probe)

I'm considering building a DAC with the Borbely I/V board (on sale from audiokits.com), but I need some suggestions for the digital section. I'm looking for something with digital XLR input. Also, if someone know of a simple digital section that I could use for testing and as a temp solution...

I building the Gilmore Dynamic with external power supply and I'll probably have a 6 feet cord between the amp and power supply. My question is, should I move some of the 5uf caps from the power supply to the amp? You want the caps as close to the amp as possible, right?

I was looking around for a DIY DAC and came across a headphone amp from Borbely sold by audiokits.com. It's a singel ended class A design. I got a quote for $37.83 for the amp PCB (two channels) and $37.83 for the power supply PCB (dual, I think). Pretty reasonable, if you consider that the...

What kind of heat sinks are needed for the 2SC3675 transistors in the KGSS amp (Kevin Gilmore Current-Domain Electrostatic)? Should I use heat sinks that can dissipate more than 3 watts? And with what thermal resistance?

Advanced Circuits have extended their free PCBs offer to 5/31. Details here: http://www.4pcb.com/Free/pc/free.asp They also offer student discounts: http://www.4pcb.com/student.htm

I'm building the Gilmore Dynamic amp and I think I've figured out how to do the matching of critical parts (DC servo parts.) Just in case, is this right? Should I match any other parts? [EDIT] Attachment deleted (contained errors)

In what range should the output impedance for the META42 be? And should there be a big difference between the left and the right channel? I'm getting 0 and 28 ohms, so I guess something is seriously wrong.

I'm having some trouble measuring the IDSS of the JFETs for my META42 following tangent's instructions at http://www.tangentsoft.net/audio/meta42/tweaks.html I don't understand the part about "apply a voltage through a milliammeter". Could I use my digital multimeter for this? And how should...

I'm building a portable META42 (my second DIY amp) for my Etymotics ER-4S. Will the suggested parts at tangent's web site make a good amp for my etys or should I make some substitutions/upgrades? I was planning on using the META42 in my portable setup when it's finished, so I don't mind...