Print Page - JRC 4558 project.

Title: JRC 4558 project.
Post by: iphands on March 11, 2004, 10:20:34 PM

I have an exrtra JRC 4558d chip and would like to build a (very) simple booster with it. i was wondering if anyone could make some plans for a booster with no switch just the chip and common resistors and capacitors. I'm such a newbee at making circuts but im good with the iron so i want to learn. Anyway thanks. oh yeah i have some pots out of an old guitar, but other than the pots caps res. and the chip thats pretty much all i have.

anyway thanks to whoever can help me put this opamp to good use.

Title: JRC 4558 project.
Post by: Mike on March 12, 2004, 08:16:14 AM

I'm a real newbie at this too but i recently modded a pedal with that chip.

I did the "TS 808" mod to my Boss SD-1 pedal. It was very simple. I don't know if you have that pedal lying around, or a TS9 but you can perform that mod with that chip.
Not much else needed.

If you want i can send you the directions I was given to do this.

Although, i'm sure everyone in this forum knows how to do this already.

Mike

Title: JRC 4558 project.
Post by: Chris R on March 12, 2004, 08:33:48 AM

you could try the Tube Reamer at runoffgroove.com

http://www.runoffgroove.com/tubereamer.html

its an overdrive.. not a boost.

C

Title: JRC 4558 project.
Post by: iphands on March 12, 2004, 10:07:32 AM

Thanks, I already modded my ts9 and it sounds awesome. i was looking to build something new.... This tube reamer is just what i was looking for.

Title: JRC 4558 project.
Post by: Brian Marshall on March 12, 2004, 04:17:31 PM

Quote from: Chris Ryou could try the Tube Reamer at runoffgroove.com

http://www.runoffgroove.com/tubereamer.html

its an overdrive.. not a boost.

C

doesnt the drive pot look a little small?

Title: JRC 4558 project.
Post by: Ansil on March 12, 2004, 05:11:08 PM

Quote from: Brian Marshall
Quote from: Chris Ryou could try the Tube Reamer at runoffgroove.com

http://www.runoffgroove.com/tubereamer.html

its an overdrive.. not a boost.

C

doesnt the drive pot look a little small?

hmm not really. i mean it gives a prtty good range of gain..

max gain at what around 470 and minum gain of

78.3

according to the basic gain principle or r2/r1

edited. also well i can see your point. as far as with a higher gain you would have more throw to the pot from low to high.. but with a minum gain of 78 then i dont' think its really meant to be a clean booster.. but i could be wrong..

Title: JRC 4558 project.
Post by: Aharon on March 12, 2004, 05:30:30 PM

Also at Runoffgrove if you take away all the octave crap from my NeOctavia,namely from the 22uF cap on,except the 100K pot you have a booster that uses both sides of the the 4558.All you have to do is choose an input and an output cap you like,could be a 0.1uF etc.
I have to post the couple simple circuits I have based on this one.
Aharon

http://www.runoffgroove.com/neoctavia.html

Title: JRC 4558 project.
Post by: RDV on March 12, 2004, 05:50:40 PM

VIOLA!!! A booster with an OP-AMP!
http://www.generalguitargadgets.com/v2/index.php?option=displaypage&Itemid=120&op=page&SubMenu=

Regards

RDV

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: iphands on March 11, 2004, 10:20:34 PM