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Topics - aziltz

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Open Discussion / Very Cool "Hyper Tap" Prepared Tapping Instrument
« on: October 04, 2011, 06:39:05 PM »
Here's an interesting project.  If you've ever heard of "prepared piano" you will understand this.  I designed the electronics & PCB for this project based on my opamp buffer circuit.  (16 channels with two mixed outputs and individual outputs to drive an A/D Converter as a trigger).

The musician playing it is Scott.  He approached me in late August looking for some help with the electronics.  We used dorkbotpdx's prototype service to get the PCBs.  I essentially designed an 8 channel buffer, in which he used 2 boards for his 16 strings.

I had seen pictures of the instrument as it was being built, but I did not know it was to be a "prepared" piece until I got this link from Scott.

Open Discussion / Feature Requests on Relay Bypass PCB Project(s)
« on: August 26, 2011, 08:32:00 AM »
I'm trying to get the Prototype order out for the Relay Bypass project I am working on.

I need some feedback/suggestions from those interested in this for possible features.

So far I am working on a Single Relay configured for single Effect Bypassing, via on board momentary or remote momentary switch.

It could be wired as an AB switch, and controlled via on board or remote momentary switch.

It could also be used to create an amp foot switch where you need to connect two control lines together from the amp for channel switching.  This would allow you to incorporate the amp switch into a bigger true bypass box or similar.

The relay runs on 2 mosfets and a CD4049UBE inverter chip.  There will also be a 3rd mosfet for an optional "Soft" Ramp on the effect output, to avoid pops because of noise/sound levels.

It will include a status LED.

Other considerations/suggestions that would make this attractive to users?

Open Discussion / Brian's Wiring Diagrams?
« on: August 01, 2011, 05:58:38 PM »
It might be a trade secret, but what are you using to make your wiring diagrams?

Open Discussion / Spam Obliterated
« on: July 25, 2011, 09:16:03 PM »
Nice catch whoever laid the smack down on the dvd spam.

Open Discussion / Klown Senator on TGP - Sunking Layout?
« on: July 13, 2011, 08:12:32 AM »
I can't tell if this is the sunking layout or not, can you?

Open Discussion / ISD1020 v ISD2560
« on: July 05, 2011, 08:30:40 PM »
I have an ISD2560, and first glance at the datasheets, comparing to the ISD1020 is that they have more or less the same pinout, with the only difference being that the 2500 series uses pins that were original NC on the 1020.  Any reason to think that they can't be interchanged in the Loophole?

ISD2560 -
ISD1020 -

I also found evidence of an evaluation system for both 1000 and 2500 series chips.

Open Discussion / Re-opening Soon?!?
« on: June 24, 2011, 07:06:56 AM »
I'm really excited to see what Brian unleashes upon us.  Time to speculate?

Open Discussion / Taylor Guitar Factory Tour
« on: May 22, 2011, 05:07:15 PM »
Just got back from a trip to San Diego and we headed out to El Cajon on Tuesday to tour the Taylor Guitar Factory.  I've been a proud Taylor owner since 2006 when I bought a Solid Sapele and Spruce 214e, (the current 200 series is laminated).

Besides the impressively skilled luthiers, machinists and robots (!), the most impressive thing about Taylor (and even more reason to love them) is that all the 300 level guitars and up are all made in the same factory, by the same people with the same attention to detail.  The only difference is the materials and appointments.  My older 214e was made this same way!

Anyway, I took lots of pictures and threw them all in an album.  The tour goes roughly backwards in the construction process.  Their show room has a ton of guitars you can play and try out. They also include a wall of all 5 shapes with the same construction as well as a wall of the GA shape in all the standard series woods, so you can really compare the shapes and the woods for the sounds.

The 8-string that you see me playing is a baritone 8 string.  It sounds like heaven with the D and G strings doubled up an octave and the whole thing tuned B to B, I believe.

There's a few candids of my fiance and I.  I will apologize in advance.

Open Discussion / Sunking ver 1 Board
« on: April 16, 2011, 09:12:52 PM »
Does anyone have the build document for the Fabricated Sunking Board ver 1?

It doesn't seem that different from version 2 in the archive, but I thought I'd ask.

Open Discussion / Laminator Use?
« on: April 14, 2011, 09:55:58 PM »
I heard laminators mentioned once or twice.  How does this help the transfer process?  Perhaps 'bean or someone else could jump in and enlighten me?

Requests / Power Supply Project
« on: January 07, 2011, 11:29:46 PM »
Hey 'Bean, here's an idea.

What about a multiple output, regulated power supply for our pedals?  Something that will generate 12v/18v, -9v and 5 or so 9v outputs.  I'd definitely buy a board or two for a project that fits in a 1590BB and kicks out some series mA's!

I'd love to have an isolated PS, basically a workalike of the Pedal Power 2, but that requires finding a nice toroidal transformer to take advantage of.

Requests / Tips/Tutorial on Single Sided Boards v Two Sided
« on: December 26, 2010, 12:19:33 AM »
Hey Brian,  I've gotten pretty good at designing single sided boards, and I'd like to get into fabb'd boards a bit.

Do you have any comments or tips for making the switch from etched single sided board design to two sided fabb'd design?

General Questions / PDF Cut and Paste Help
« on: October 19, 2010, 09:01:18 AM »
When I etch boards, I take everything I want to make and panelize it into a 5 x 7 or 6 x 9 PNP for copper clad just using Powerpoint to arrange and print, and it works really well with the JPEGs I generate from Eagle.

However, it does not work very well when I cut and paste from PDFs like madbean's designs.  Things get slightly stretched and I can't seem to resize without losing resolution.

do any of you graphic-savvy people know how to do this?  Cut out the ready-for-transfer b/w images from 'bean's build notes so I can use them in my Powerpoint transfers?

Thanks in advance!

Tech Help - Projects Page / Catalinbread Project Questions - DLS/SFT
« on: August 06, 2010, 07:07:33 AM »
Hey Madbean and friends,

I've been breadboarding a new design that's based on the Catalinbread SFT/DLS method of chaining MuAmps together with Filtering between them.

The only real difference is I'm attemping to use SRPP stages instead of MuAmp stages.  I'm noticing some note "fizz" that comes on with the attack and fades out before the sustain does.

Has anyone noticed something like this on the DLS/SFT builds?  I'm hoping to confirm that it doesn't exist in those projects.

I'm still toying around with the gain and frequency response of each stage, trying to get a low gain but bright sound similar to the DLS but using SRPPs for better performance.

Thanks for your help!

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