Some of these young chaps out there in Netland, and especially the DIY effects community, seem to appreciate my way of making a printed circuit board. It seems my pen and paper approach hearkens back to the early effects of the seventies for a few of them and this nostalgic kinda feel I seem to be able to get has a few of them. at the moment, asking me to design layouts for them. So I have.
This ones the Okko Diablo which seems to be a nutso version of the BRIASB, or something like that (actually BSIAB 2 “brown sound in a box“), which features cascoded, I think thats what the configuration is called, fets, or is it SRPP? Something anyways that started back in tubes and has found uses in modern effects. The bottom fet voltage amplifies and the top fet current amplifies so it’s the best of both worlds I suppose. This circuit has been tweaked and pushed to the limits of oscillation I would suppose and may be quite the scary animal. 2N5457’s, mpf102’s or J201’s would be the most likely candidates.the blow ups here
Heres the original schematic (you might have to join freestompboxes though)
Then we have a young chap whos built an amp from various IC’s again to kinda emulate tube amp stages, and quite fancies my layouts for his own stuff… so did I have. Discrete fets as above and then the IC’s moving from left to far right are a TL072, an LM386 and then the amp IC LM1519C… 12V for the preamp and 16V for the big amp which would need at least 2A of current.
link to photobucket here