Recent content by ced1

FKPs dont come big sizes, I think the max FKP4 is 1.5uf so its kinda irrelevant for that position. But I use FKP1s for coupling. No big difference tbh. cheers ced

And onto the final leg. So other resistors that merit the Caddock treatment are those in the direct signal path: R18, R19, R15, R16. As a stop gap I'm only using 3, and the rest are Vishay Dale PTF which are precision versions of the RN60s. R19 can likely be bypassed with wire, and the other 6...

Indeedy, he he. Problem is the amount I have used so far gets you a big no no on the samples front.

And quietly; I can let folks have some of my stock of 22uf non inductive box MKPs at cost if anyone wants the considerable pleasure of a couple in their pre. Just drop me a PM. Ced

Hi B, yeah bit too good. Bit dusty today, hooo. Onwards: 5) The VAS. Q6 is the VAS transistor and Q3 its cascode.Q14, Q15, R30 are the CCS to drive the zener U1 etc. Its just the 'upside down' PNP version of the NPN input cascode. Again C9 is a small value polypropylene wima to trim off any...

There is an alternative strategy to this one could try which won't gobble voltage headroom like a greedy turkey. A post I kept from ALW from around 2006: Another tip I've used very successfully is to add a sutiably chosen, low DCR (high DCR has the same audible effect as adding a series...

So its friday night, I'm completely smashed!! After a shit week , more than some beers too many, just stagggered home like a Thunderbirds puppet and listening to The Roots, Things Fall Apart. Not normally a huge fan of rap but bloody awesome album, thanks Txabi. Pizza is 2 minutes away, and for...

So, the LPA5 features in more detail: First the Naim vs Bootstrapped topology. Look at the air guitariste LPA1 schematic and the LPA3 funk monster. So the redbox LPA5 is designed to switch easily between these topologies. For Classic Naim topology, on the LPA5 remove R16 and cut track B. For...

cheers guys, glad you enjoying. Yeah the output dc offset and input coupling cap. I remember conversations to this effect a while back, puzzling over this, working it out and it didn't calculate. Basically you have to bias the input transistor base/gate away from 0v to get 0v output offset...

And after a small break for an intensive course, back to this. So despite some v interesting bits on current sources and inductors (of which I answered my own knee jerk questions with 10 minutes of research, lazy boy), I'm going to leave those to one side for the moment so this thread actually...

Here we go. One of the more adventurous current sources in that book, for a laugh. I think it was for aviation or something. Please don't try to build it or use it unless you know what you're doing and can build from first principles. I copied this years ago, probably made some mistake and...

Well my observations after long breaks are; there are far too many, very modest people on this forum. Its turning into an absolute pleasure. Bemused, anyone that can build your dac is far from having found capability (or sanity) limits yourself. I hope to start delving into your adventures in...

And this is the big 900VA beast in the poweramp: R800 core with 2x100VA windings + 2x350VA windings, 900VA in total. Originally intentioned to power 1 channel of a huge poweramp, until I decided that actually going active made a lot more sense. As I mentioned, seperate windings for + and - of...

And crap, yep your other excellent point. I really do love where you're going. Same wavelength I feel. Have I ever tried choke regulation? You are truly the prince of darkness. So I have had these looking reproachfully at me from my parts bins for over 5 years: My only defense was...

Hi John, thanks for the excellent post. And pleased my waffle is gelling with one person at least, heh. Also, love that you've seem to have referenced a lot of the same sources I have. If I'm not mistaken, that circuit is one of the variants of the Gary Pimm depletion mode mosfet CCs is it not...