HAO Rust Booster II

[CoolJohnny]

anyone reverse engineered this one?

[markm]

Not me....
I wonder if there's a big difference in the circuit from the Rust Driver?
Could be as simple as no clipping diodes but, I don't know.

[CoolJohnny]

saw that layout of yours and figured i'd breadboard it and see what i can come up with. i cant remember ever using an LM358 op-amp before so this will be new territory. you wouldn't happen to have a schematic of that layout you've posted would you?

i tried the single-knob green HAO boost (can't remember the name, the plexi-sounding one with the three tones settings) at a shop. i liked it but it had way too much gain for me so i thought i'd try to come up with something a bit tamer.

what i'm looking for is an overdrive that can take me from my dod 250 clone (that i use basically as a heavy bost) and into fuzz face territory without all the mud.

and additionally, would you be ammenable to making a board or two for a guy with no printer or practical room to use chemicals?...for a fee of course...

[jonathan perez]

what i'm looking for is an overdrive that can take me from my dod 250 clone (that i use basically as a heavy bost) and into fuzz face territory without all the mud.

so why not just keep the 250, build a fuzz face and modify it?

[CoolJohnny]

you would think that would make sense wouldn't it? but i don't know, something about the popularity of the fuzz face makes me wary of it. for that matter i've never played a tubescreamer a RAT, univibe or any obvious choices out there (not that they are popular for the wrong reasons). and besides, i've made so many two transistor overdrives i feel like i've learned all i can from them, with pleasing results. im interested in trying designs im not familiar with, and built the 250 pretty straight. want to experiment more with opamp designs. make sense?

[markm]

and additionally, would you be ammenable to making a board or two for a guy with no printer or practical room to use chemicals?...for a fee of course...

Perhaps.......
Here's the schem;
http://matsumin.gozaru.jp/diy/jisaku_fx/RUST_DRIVER/HAO_RUST_DRIVER_ori.BMP

[JHS]

The RBI/II is a simple preamp-circuit, based around a single opamp (like a dozend other IC-based booster from the cookbook). The RD-circuit ist way more complex. Technical and soundwise it's nothing more than the IC-version of the old  E-H LPB-1 boost.
The input impedance of the RD is under 50k, IC is a TL0.

If you increase the I/O caps of a RBI, the booster will sound more like a RDII.

JHS

[markm]

Huh.
Interesteing.
I had assumed that perhaps it was just the same "trick" MXR did with the D+ and MicroAmp.