Barber Electronics says happy holidays with a circuit!

[Ben N]

Anybody know where to find a datasheet and/or a source for JRC 072BD?

[stibu]

JRC stands for Japan Radio Corporation. A few years ago they changed their name to New Japan Radio or NJR for short.
Their site is here: http://www.njr.co.jp/index_e.htm

Here is a link to the part you are looking for: 
http://semicon.njr.co.jp/njr/hp/productDetail.do?_isTopPage=false&_productId=6&_moveKbn=PRODUCT_DETAIL_MOVE_SPEC

[flo]

Any dual opamp will do. For instance a low cost TL072 or a high cost OPA2604.

[sixstringphil]

Anybody successfully printed Madbean's layout? It says 600dpi but opens in Photoshop as 72dpi and it's already huge.  Changing resolution to 600 makes it enormous.  Help??

Phillip

[John Lyons]

Open it up in PS and select a .1 grid in preferences.
Set the resolution to 300 and mode to RGB.
Select and then scale it while holding down shift.
The Pins of the IC will line up with the .1 per inch grid
when it's the right size.
Either that or email me and I'll send you the layout sized
correctly.

John

[bean]

In Photoshop: use Image Size - uncheck 'resample image' and type in 600 for the resolution. It will be properly sized.

[sixstringphil]

Thanks John and Brian! Both solutions worked well! Can't wait to get started on this.

[Heemis]

Just breadboarded this circuit and I love it!  It's all I could ask for in a transparent overdrive.

Since I like to keep things simple, I was hoping maybe Mr. Barber could enlighten us with the factory default settings for the trimmers in the circuit... perhaps even suggest stock fixed resistor values as he does for the mid control.

Again, thanks for this fantastic circuit!

[deaconque]

Just finished mine today (from Madbean's layout, thanks  ). 

[tuckster]

I built it and it sounds good. TR1, TR2 and the Tone Pot doesn't change the sound?! I checked the traces, I checked the pots the ..everything.. I even resoldered the damn trimpots because I thought I fried them.
The sound (as it is) is very cool with out the use of the obviously not working pots but ar ethere any suggestions about what could be wrong?
I used this layout: http://www.aronnelson.com/gallery/main.php/v/slackers-stuff/diyltdboard.jpg.html
Would it be ok to post some voltages or any other stuff? I don't know what could be wrong.

[deaconque]

I built it and it sounds good. TR1, TR2 and the Tone Pot doesn't change the sound?! I checked the traces, I checked the pots the ..everything.. I even resoldered the damn trimpots because I thought I fried them.
The sound (as it is) is very cool with out the use of the obviously not working pots but ar ethere any suggestions about what could be wrong?
I used this layout: http://www.aronnelson.com/gallery/main.php/v/slackers-stuff/diyltdboard.jpg.html
Would it be ok to post some voltages or any other stuff? I don't know what could be wrong.

I had the same issue when I built mine.  I think I adjusted some values inside slightly but I can't remember for sure, it didn't really help.  This pedal is what it is and doesn't do a whole lot else but it does sound great.

[tuckster]

Yes in deed. But somewhere I read about the flexibility " it is so flexibly and can produce a lot of different sounds because of the trim pots" - that's simply not true
Maybe I have to buy the original to get this flexibility. But to be true - I don't need flexibility because, as mentioned before, it sounds really good.

[Just1More]

The external tone control is very subtle.   Presence is pretty subtle but Mid and Bass trimmers should make a noticeable difference - mids particularly.

[mikemaddux]

All mine work fine....tone control has a pretty big sweep on mine......presence doesnt do that much though...

[Brymus]

Just finished mine today (from Madbean's layout, thanks  ). 

I really like the graphics on that enclosure.
What type of enclosure is that ?

[deaconque]

That's one I picked up from Experimentalists Anonymous a while ago.  Not bad for $4 but it's a much harder metal to drill through than the standard box.

[Thomeeque]

 Hi fellas!

I'm just curious, was somewhere already mentioned what are "factory settings" for PRESENCE and BASS trimpots?

Thanks, T.

[BoxOfSnoo]

Here is rev. 1.0. Enjoy.

Is there any mirror of this anywhere?  Or an updated PCB?

[tuckster]

Here is rev. 1.0. Enjoy.

Is there any mirror of this anywhere?  Or an updated PCB?

http://www.diystompboxes.com/smfforum/index.php?topic=83838.msg697351#msg697351

The image is small but maybe madbean can provide a proper resolution

[BoxOfSnoo]

Here is rev. 1.0. Enjoy.

Is there any mirror of this anywhere?  Or an updated PCB?

http://www.diystompboxes.com/smfforum/index.php?topic=83838.msg697351#msg697351

The image is small but maybe madbean can provide a proper resolution

Thanks!  I fought through it this morning and came up with this:  (Not verified yet)



Parts list the same as on MadBean's layout.  Any gross errors anyone can see?  (I fixed a little one on the bottom-left corner, plus colored the traces so I could see what was +9v, GND, and +4.5V)