sbelyo

Anyone interested in a Universal Signal Isolator shield for the Arduino DUE? http://www.dimdim.gr/arduino/universal-signal-isolator-shield-for-the-arduino-due/ Found this while looking up how to add a display to my dac. I'm looking to order some boards so I thought I would see if there is any interest here

too sad

it's a very good output stage but for me in stock form it's a tad bright. For the SE outputs I swapped the opamp out to OPA1642. That gave me the sound I was looking for along with amtrans filtering caps and PRP resistors. I just want to see if building another one with 0.1% PRP's and Silmic II electrolytics makes a difference

The Longshot is one of my favorites. The toilet bowl scene is classic

I'm building this to see if I can improve on the sound of the first one that I built using 1% PRP's. The original kit uses yageo and when I swapped them for PRP the sound improved so I figure why not try to match to 0.1 to see if it makes a difference. You're probably right but the PRP's are only $0.35 a piece so I figure it's worth a try. That was my other thought as well. I priced out a full set from TC and it was like $382 so I'm not gonna do that route I bought this meter since it seems to fit what tangent recommended for matching resistors and wasn't expensive https://www.ebay.com/itm/113744202815 I'll order 10 resistors for each position to see how close I can get

I looked at those briefly, anywhere from $10 - $15 each. There's 28 total resistors needing 0.1% the schematic is here http://www.twistedpearaudio.com/docs/linestages/ivy3_schematic_1_0.pdf The 0.1% resistors are R1-R4 R5-R12 R13-R16 R17-R24, R32-R35 I will look this up and give it a try Thanks

It's for the TPA IVY-III output stage. It's my understanding it's the accuracy of the resistor value is the critical part

I want to match some PRP resistors to 0.10% so I read tangent's blog on this and I need a meter with 10,000 counts or better. Is this worth doing or am I wasting my time? I was wondering what everyone else's experiences were?

If I remember it was from knowledge only. I was going to build it around the same time frame you mention and at that time I don't think there was anyone using it with headphones. I bought the custom iron, the board, and all components and then wound up selling the board and components to fund other projects at the time. There's a TSE 2.0 board coming soon so I think I'll revisit this. Definitely keep us posted on your efforts

http://tubelab.com/

I had acquired all the parts to build one except for the power transformer. I too have a set of electraprint output with a 5K primary and 32, 80, 120, and 300 secondaries. I sold the board and components but kept the OPT's and the 45 tubes. Someone on DIYaudio had said that the secondary values I chose would be too noisy for headphones. How does it sound on the 64 and 300 ohm taps?

anyone have a pair of these boards?

That is an IVY III I used PRP resistors, Nichicon Muse caps, Amtrans caps, and swapped out the opamp in the BAL/SE stage. If you search the IVY thread on Diyaudio there's a record of what i did. I'm going to build one more IVY with more tweaks just to see what it sounds like.

finished my Twisted Pear BIII Pro SE (9028)

What case is that?

No worries, lol My mains run at the same voltage so I'll start with that transformer

I'll try, I was just posting as they came to mind Congo5 used a 300V @ 340mA and wound up with 399Vdc using a BH Ultamini psu

Those do work... I was focused on the 400V rating and didn't realize the different CAT rating thanks. What transformer did you use?

I measured the pin spacing on the boards as well as the BH Ultramini PSU. They're all 5.08mm The MKDSN series are all 7.62mm It doesn't look like they'll fit and I don't see anything in that size higher than 300V

I just realized that the terminal blocks should be high voltage as well. Jose, what terminal block are you using?

cool thanks

Thanks... Is metal film 1/4 watt 1% 100 ppm ok? Is one series better than another

Are these the right transistors? https://www.mouser.com/ProductDetail/ON-Semiconductor-Fairchild/KSC2752OSTU?qs=sGAEpiMZZMshyDBzk1%2fWi8oN7VHZ91OkpQ9k8BYJNao%3d https://www.mouser.com/ProductDetail/ON-Semiconductor-Fairchild/KSA1156OSTU?qs=%2fha2pyFadugv%2fWJliOE2i01ObXewH%2b9W60g4Ozyqyh8LU2w5on%2bF8w%3d%3d And for resistors I'm guessing RN60D's are ok?

That GTI color is dope though

Got a pair of Hifiman he560 Excellent headphones. I had one slight problem with them as the highs are a little forward or bright (hopefully they settle down). You'll definitely need an amp though.