dist+ruby??

[kindred]

Forgive my noobness when it comes to this kind of stuff, i know roughly how things work but im real fuzzy on the details..  But i was thinking it might be fun to take roughly the ruby circut and graft a distortion+ type thing in front.. maybe use a tl072 for the ic so i can use the second half as the ruby's input buffer? would that work or would i still have to use the mpf102.

hopefully end up with a mini head.. kinda 80's sounding.. could probably leave pins 1 and 8 open (on the lm386) to let the dist+ do its work.. and maybe just use the dist+ controls to control volume and gain. great little campfire/busking amp for a little metalhead like me?

Anyway any suggestions or advice would be greatly apreciated.

ps. yes i know the 386 isnt capable of much metal chug.. but thats not the primary reason for this amp anyway

[Gurner]

Sure you can do it - you only need a single opamp (ie the first stage is acting as a preamp & the buffer so no second stage needed)

The reason most don't go this way is becuase using jfet is considered more guitar /sonic friendly (then ironically then feeding it into an LM366, which is ermm ....ok, I digress).

Just remember to use the TL07x's  non inverting input, as this will yield a much higher input impedance (like in the order of seveal megaohms)

[kindred]

thanks for the reply gurner. i was thinking the tl072 just cause its the only dual opamp i know off hand (and i know tl071 is commonly used as a mod to the dist+).. i though use one half in place of the 741 in the dist+.. the other half for the ruby's input buffer.

basically your saying the dist+ circut would act as a buffer in itself?.. so basically (dist+ --> input cap --> input pin on 386) correct?

also which is the non-inverting input?.. "in-" or "in+"? or is that off base all together lol?

[Gurner]

basically your saying the dist+ circut would act as a buffer in itself?.. so basically (dist+ --> input cap --> input pin on 386) correct?

I only mentioned a TL071 as you don't need a dual opamp. That said, a dual opamp offers more flexibility, isn't that much bigger nor any more expensive, so probably better to go with that. You got the chain correct.

also which is the non-inverting input?.. "in-" or "in+"? or is that off base all together lol?

there are two non inverting inputs on a TL072.... they are the in+ (pin 3 & pin 5)

Connect your circuit up like this (this is the first similar type config cct that 'google image's found, unfortunately there are no values, but make R1 & R2 something in the order of 470k)...

http://farm4.static.flickr.com/3112/2618476659_4c8d66c750_o.jpg   (note the opamp is different to the TL072 but the pins match)

[deadastronaut]

ps. yes i know the 386 isnt capable of much metal chug..

what no chug!?...do my ears decieve me?.. ive been wasting a lot of time then!....
it wee's all over a dist+ imo!.

http://www.diystompboxes.com/smfforum/index.php?topic=86389.160

heres the sound test of it...into a marshall clean channel..

http://www.youtube.com/user/100roberthenry#p/u/6/W_5SZVyUP-Y

[askwho69]

hi kindred... Did you do it? i was planning dat too.. when reading this thread i had my nose bleed i dont understand.. can you show pics? schemo?

PS Deadas.. wow nice pedal there! i like the hi gain sound...