It's time for a reality check. 16 bit I2S discrete R2R DAC.   Does this look like it will work? Any mistakes?   I don't expect spectacular sound quality, it's really just a learning toy.   The XOR decides if it listens to left or right channel data. The rest is just a 32 bit...

Trident will be a portable amp in the tradition of the PPA.     This thread is to express interest and discuss design goals.   Happy reading!   (continued from a conversation started about here)

My heart and prayers go out to those involved in this terrible tragedy.

I'm not so good with numbers some times...   What number is the distortion figure supposed to be..? .0000083176%..?    

Here is the new DIY project that will keep my busy for the next three weeks or so...       Can anyone guess what kind of bird it is?

This is an offshoot of the thread "Some LME49600 implementations".   This little board is meant for the BUF634 in TO-220 package and a dual channel op amp such as LME49720 in DIP. In fact, the schematic is pretty much the one found in the LME49600 data sheet. It is done with almost all...

As anyone who has had boards made at a board house knows, they can be expensive.   Maybe we can get something going where if someone is doing a run and has some spare room on a panel they can throw some other members boards on as well to fill up the panel.   Mostly I etch my own...

I've seen many creative methods of mounting this chip properly.   Here is my suggestion: Thermally conductive adhesive.   In my previous employment as an Engineering Technician it was my responsibility to cobble together test equipment. One of my pieces for testing laptop computer...

Can someone smarter than me look this over and see if I did it right..?     It's supposed to be a Wilson current mirror driving a differential input stage.

Does anyone know what program is used to draw schematics like this:     These drawings seem to have been very popular at HeadWise.

I was fooling around with Richard Murdey's JFET-MOSFET amp as presented here and here. This is what I came up with:     Any comments or suggestions?

I'm building a desktop amp. Power will be a center tap transformer. The power supply is a dual rail 317/337 in the standard arrangement with filter caps that go from each rail to the center tap of the transformer. The ground return from the headphone jack also goes directly to the...

Does anyone know how to get Eagle to print out in Negative?

I got a couple of the DS1802 Digital volume controls to play around with and was wondering what others have come up with for their applications. I see that you can either use it single ended or with dual rails. I would like to use the dual rail solution. How have you created the +/-2.5...

I found this Sijosae design and thought I would try and update it and improve on it a little. Seeing as I am just learning design I thought I better get some opinions before I let the magic smoke out of several innocent transistors.   Here we go!  

I'm looking at building a Gilmore Lite/ Dynalo  but am having a devilish time tying to find the FETs used in the front end. 2SJ109 and 2SK389 are the original spec and 2SJ74 and 2SK170  have been listed as subs. All of these are pretty scarce. Are there any modern/commonly available...

I have this amp I made this week and I have a little problem with it...but now it's fixed.

I though I would start a thread for people to show off their etching skills and maybe share a bit of their technique.

Fred_Fred asked to see the method I use to make my boards. Here is the technique I use to make them:   First, you need a few basic supplies.     Transparency film Positive resist copper clad board Positive developer solution Exposure light (I built my own)   Not shown...

I have two amps built the same except for the gain factor. One has a gain of two and the other has a gain of five.   My question is: does the gain factor affect the dynamic range? My gain of two amp sounds more flat, less dynamic than the gain of five. What do you think? Any comment on...

I think I will start this thread where people can ask their dumb and not so dumb questions about how things work and how to design circuits. Maybe we will collect some valuable information and maybe not...

Here is my contribution to the DIY community. You can use this on it's own as a Buffer or integrate it into a larger design. I'm open to improvements but wish to keep the design very simple. The three channel layout has a high PSRR so you don't need an elaborate power supply. I just...