Quote: Originally Posted by polumenta Hello, I'm new to making heaphone amps and I wonder what use of volume pot when you can control your volume by your soundcard or iPod? It's just a handy volume control so you don't HAVE to adjust the soundcard/iPod. Quote: If there...

Why do you guys want little LEDs to light-up to sense the signal level? If you need a rough estimate, aren't your ears good enough? And, if you need something precise, why wouldn't you use a voltmeter? If you really want to do this, then drive the output signal to four comparators (eg: use a...

Quote: Originally Posted by aeriyn Well, that got me thinking about my idea of using toothpicks to clear blocked holes. Solder won't stick to wood, so... hmm. It works! This is exactly why I wouldn't use a toothpick for this task. I'd use a surface which solder will adhere, such...

Quote: Originally Posted by Garbz Hi all Can anybody help me out with values for a resistor and capacitor to put at the input of an amp? In a passive low-pass filter (RC), the -3dB point, wb (the point of half power), will be at (1/RC). If you want a -3dB point at, say, 2KHz...

Quote: Originally Posted by aeriyn But the bag says ESD on it. T.T The bag lies Quote: If I didn't drop it on the floor I'd probably be okay. >.>; Dropping it wasn't the problem. Touching it after it fell before grounding yourself was the problem. Quote...

Quote: Originally Posted by aeriyn Semiconductors are fairly static sensitive. That's why they tend to come in ESD bags. =P Anti-static bags. Quote: Just today I dropped an AD8610 opamp on the floor... it's carpeted. When I went to pick it up, I zapped it. You've...

Check out the following PDF for various Kobiconn 3.5mm jacks from Mouser (PC mount, surface mount, and panel mount): Link

Quote: Originally Posted by aeriyn first my rail splitter blew. now a pin broke off the opamp adapter and got stuck in the damn socket. this amp is trying to drive me insane, I think. Aren't females supposed to have a soft touch? Quote: the problem with the braid is...

Quote: Originally Posted by guzzler You can rearrange the sijosae buffer to make it vertical mount... Wouldn't be very mechanically-rigid at the joint if it were vertically-mounted, and that worries me. Quote: edit: meant to add, the sijosae buffer can be shrunk even...

Quote: Originally Posted by dokebi You could try etching your own. Try searching for jung buffer and diamond buffer. Too big Quote: Originally Posted by Dreamslacker How about the buffer used in the PPA? The HA3-5002. I believe Newark carries them and they're cheaper...

Hello, I am in need of a compact, low-cost alternative to the BUF634 for an output stage in a headphone amplifier. I have heard positive things about the EL2001, but I can't find a single distributor for the IC (has it been EOLed?). An output stage constructed from discrete components would...

Yup. You need quite a bit of current, and it's difficult to get the same current density throughout the entire part, and an uneven distribution means the colour will be uneven as well. I've seen a lot of anodizing work where there are blank spots on the metal because of electrical issues.

I'm not sure if I count 4 or 5 wires there (plus shielding fibres). Regardless, tie two cables together on one end and solder it to the ground connection on your mini jack. Then pick your wires for the left and right signals and solder to the mini jack. Eg: - tie white and black...

Quote: Originally Posted by tangent Yes. It's important for the output jack in a PIMETA or PPA to be isolated when you're using a metal case, because otherwise input and output grounds are shorted together, which causes problems. oic. Quote: Originally Posted by bg4533...

Quote: Originally Posted by bg4533 Are you looking for panel mount, pcb mount or inline jacks? Panel or PC mount. Anything but surface-mount, really. Quote: These are the jacks I used in my Pimeta: Link. The jack area is gold plated, but the terminals are not. It is...

Who makes these, who sells them, and how much is this going to cost me? Silver-plating would be better as the resistance is lower and the durability will be higher (harder than gold). Options?

Quote: Originally Posted by AndrewFischer Any socket will also add a very small amount of capacitance between the IC pins. I doubt I could hear it. If your ears can hear the difference between a $20.00 RCA cable and a $100.00 RCA cable omitting sockets is worth a second look. The...

Quote: Originally Posted by tangent No, the amp will not operate without it. Sure it will. It'll just bring new meaning to the word, "distortion"

Quote: Originally Posted by bg4533 Finally, the people at diyAudio mention that the OPA627 (I imagine the OPA637 even more so) needs a lot of close bypassing. I am using the 6.8uF Wimas for the Pimeta C4, but they are kind of far from the opamps, especially when you consider the browndog...

Quote: Originally Posted by 1racerx roadbuster: I assume after its engraved you can wipe paint into the impression to create the effect.? Honestly, I don't know how they colourize the grooves of an aluminum panel which has been engraved. Drew from shellbrook labs (drewd) makes...

Quote: Originally Posted by drewd Look at Lansing Enclosures for some interesting cases. They don't have a big variety, but the prices are reasonable. The MicroPak D case is a pretty straightforward extruded case. They also have some extruded cases in two piece designs. The Graybox line...

I'll take 12 boards, please. I'll probably kick that order up to 20 if the price is still low.

"Mono" refers to a "monolithic" or "multilayer" capacitor. This just refers to the manufacturing process whereby the capacitor is formed by binding multiple, thin sheets of ceramic on which electrodes have been painted (sandwich of sheets).

Quote: Originally Posted by jnewman If you think that the $30 that they're hoping for as a target price in that extrutech group buy is a bad price for a case you're going to have a very, very hard time finding a lot of options - most of the casemakers' decent lines start above that...

Quote: Originally Posted by kloan I just found out that the stainless steel one I used is not available in polished form, now only available as brushed steel.. but it's also $10 cheaper.. $19.99 CND. Can't provide a link though, cuz I've only seen them in a few shops here in Toronto, and...