HAO - Rust Booster I + Rust Booster II LTD

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

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sosodef
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Post by sosodef »

I am working on a cool pedal its my "camel toe"

channel 1. I need a good boost and want to build the hao
channel 2. I built a dist+ with hermida style

I could really use a perf layout for the hao. That would make my week :P

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Post by Bernardduur »

Anyone knows what makes this pedal tick? I am quite interested :)
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RonScott1
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Post by RonScott1 »

Hey Guys,
This is the schematic for the HAO Rust Booster I and also the Rust Booster II and also the manuals. (one is in Japanese) I traced this schematic from model #206 on the Hao Rust Booster I and #77 on the Rust Booster II. The two effect are exactly the same however, The RB I uses a TL072CN opamp and the RB II uses a TL072CD opamp. Both manufactured by ST. Both effects sound exactly the same. Sorry no gut shots I am waiting on my friend to scale them down for me. I will post them as soon as he is finished. I built them both on my breadboard and tested them to the origianls and they sound identical. There cool little effects. I also saw gut pics of a Rust Booster III and it appears like nothing has changed. Enjoy!
Best,
Ron

Edit: Sorry that the images are so large, I am still very new to this board.
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Rust Booster II manual
Rust Booster II manual
Rust Booster I manual
Rust Booster I manual
Schematic
Schematic

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ik6gpy
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Post by ik6gpy »

Many Thanks for sharing! :thumbsup
Matteo

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briggs
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Post by briggs »

8) Cheers!
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analogguru
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Post by analogguru »

Thanks ! (But..... )

:hmmm: D1 is drawn in the wrong direction - or more probably is not a 1N914.
I would assume that it is a zener-diode with a value of 5,6 V.

BTW, if you save such a schematic as black-white .gif picture the size is smaller ad the drawing stays sharp (as you can see below).

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RonScott1
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Post by RonScott1 »

Hey AG. You are right. I just opened it back up after reading your post. I had ommited that part on my breadboard because of the led already on my byass box. Pretty cool feature though.
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Ron

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Fuzzer
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Post by Fuzzer »

I think that's what modern BOSS pedals and Ibanez pedals do, for the LED.
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Post by soulsonic »

Nice and simple. Thanks RonScott!
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analogguru
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Post by analogguru »

Fuzzer wrote:I think that's what modern BOSS pedals and Ibanez pedals do, for the LED.
No, thats wrong....: it´s done in old Korg pedals...

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modman
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Post by modman »

Good work! Thanks for sharing Ron! If corrections are needed and attachments need to be removed, just drop a line.


(merged with an older thread containing pics from the three different versions)[/color]
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Post by JHS »

The crucial part is the IC in this circuit. My clone sounds best with a TI 072 and JRC 072BD.

It seems that 072 from other manufactures don't have enough slew rate. Acc. to the spec sheets they have 10 - 12, but IMHO they are only something relabled. Slew rate is app. 2- 4 and they produce no headroom in this circuit, a harsh and brittle or a muddy tone.

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Fuzzer
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Post by Fuzzer »

Man, but I'm not lying with the LED thing, I just checked and here it is for the DD-2 and the Tubescreamer;

I mean, you bet Korg pedals have it, as you said, but also the ones I mentioned.
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Frag2.jpg
Frag2.jpg (27.29 KiB) Viewed 2608 times
Frag1.jpg
Frag1.jpg (2.92 KiB) Viewed 3709 times
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Post by analogguru »

Maybe I didn´t express myself good enough:
I was not talking about the use of a zener diode (only).
I was talking about an identical arangement of components (as can be seen below) - the source where the idea was borrowed from. And this was done by Korg. As far as I know the other pedals use electronic switching. :wink:

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Post by Fuzzer »

Ohh, I'm sorry, I also didn't express myself correctly; I was solely speaking about the zener diode for the Indicator arrangement, when I wrote the statement above.

Anyways, thanks for the complete explanation.

I have to note something though, and is that the 47 [uF] capacitor is oriented backwards, in the schematic for the Rust Booster.
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Post by devastator »

Why there're a "boost" control and a "level" control ? It can really give an overdrive tone whithout clipping diodes ?

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JHS
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Post by JHS »

Vol. sets overall output level, Boost fattens the sound and generate a harsh distortion and a bass cut when maxed.

The distortion doesn't sound good on it's own or in front of a trannie amp but it's excellent for boosting an already distorting Brit. NM tube amp. The harsh dist. with it's decreased bass blends perfectly with the amp distortion w/o making the sound whooly or muddy.

JHS

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Post by devastator »

ok thanks for this explanation :D

So, isn't an overdrive more a crancked AOP :lol:

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celadine
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Post by celadine »

Remember to leave the extra opamp unconnected! :D
(i.e. tl072 has 2 opamps + power supply connections - leave the 3 pins of the unsused opamp unconnected)

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