I'm trying to revive an old project which was built without its own power section/voltage divider and never was powered by anything other than a bench supply. Ideally I'm looking for something similar in spec to the now discontinued Elpac WM072-1950-D5. Any suggestions on a similar product?

I was taking apart my crappy Ratshack/Optimus DJ mixer (which serves as my preamp) to fix a broken ground wire when the irresistable urge to tinker struck. It has several NJM4558LD opamps which I'd like to replace, unfortunately they're in SIP-8, and none of the opamps which I'm familiar with...

I built my RA-1 with a power switch between one of the positive battery leads and V+ on the opamp. I wasn't really sure if this was what I should do, and it appears that it wasn't, as one of the batteries will be dead by morning if I leave them connected overnight. How should the power switch be...

I spend all day putting the finishing touches on my RA-1 clone. When I plugged it in and turned it on, I got sound, but it was terribly distorted (scratchy) to the point that it would be unrecognizable if i didn't know what CD was in the player. There was also only sound on one channel. When I...

Hi, my name is uniuniunium and I am a DIY Audio ignoramus. [audience: hi uniuniunium] I have this problem. You see, I've never built any kind of electronic equipment myself before, and as such, I've never bought the parts for such a project. I've decided to build myself this phono preamp (I'm...

I was hoping i might find a good DIY project here, given the simplicity of the RA-1. Anyone have/know where to find a scematic or under the hood pictures?

I'm looking for a good (Class B+) DIY phono preamp to build over the summer. I'm a relative beginner to DIY audio, although I have some concept of basic electronics, so easier is better. Anyone have recomendations?