|
Post by beanmachine7000 on May 5, 2006 9:36:53 GMT -5
Hey guys me again... Ya'll were so helpful with my last question i figured I'd come here again... I would like to put some kind of a switchable gain boost into one of my guitars... That way I could have my clean sound then just hit that to go to my dirty sound... I'm terrible with pedals, lol... I was just wondering if you could point me toward a schematic somewhere thanks...
|
|
|
Post by sumgai on May 5, 2006 11:27:59 GMT -5
Paging JohnH.... Paging JohnH. Dr. John, please report for surgery in room 11468981, thank you. Hang in there, Bean, the good doctor will be along in a moment. ;D sumgai
|
|
|
Post by dunkelfalke on May 5, 2006 15:28:13 GMT -5
|
|
|
Post by JohnH on May 5, 2006 15:58:31 GMT -5
Quite possible to do, and Ive played with that alot. My circuits got to the point where what I wanted was too getting much to put into a guitar, and so by about Mark 9, I am doing this in the conventional pedal format and getting very good results, rather than as a built in. Also, having done a cool circuit, as a built-in, it will only work on one guitar. So I now just put a small buffer amp in the guitar and I can do my fiddling on the pedal. However, if you want to do this, the easy way is using a circuit such as dunk pointed to (havent tried them though), and another source is guitar fetish store.guitarfetish.com/activepreamps.htmlIf you want to home brew, there are some great circuits at www.runoffgroove.com and you can listen to sound clips. The Odie is quite good, or maybe one of the muffs or fuzz faces for a nastier type of sound. Heres a warning. These distortion circuits are naturally very high gain. Putting that into a guitar cavity with sensitive pickups nearby can lead to various inductions from the booster wiring, back into the pups, causing screaming whistles, in a bad way. So it needs some care in use of screened wires and location of the circuit good luck! John
|
|
|
Post by fobits on May 5, 2006 16:08:29 GMT -5
If you're looking for a schematic, here is one which is simple enough: www.till.com/articles/GuitarPreamp/index.htmlHe seems to be happy with it, although my own opinion isn't so high. If you read the fine print, he advises that you should buy a handful of transistors, then breadboard and test each one individually to find the one that gives the right dc voltage at the drain. It also draws a steady half-milliamp of current. IMHO you could do better with a bipolar transistor, if you're willing to live with a half mA of current, but he likes the sound of an overdriven JFET <shrug>
|
|
|
Post by JohnH on May 5, 2006 16:25:34 GMT -5
The Tillman circuit is good and useful as a buffer, but it is just a clean booster with a small gain. Not enough to push it 'over the cliff'
John
|
|