Archive for November, 2007
Wednesday, November 28th, 2007
LTSpice Analysis and the DOD Overdrive 250
Here is a run through the kind of calculations one can do with LTSpice using the DOD Overdrive 250 circuit as an example. You can download the LTSpice circuit (schematic) file for the DOD Overdrive 250 and related files … more …
Monday, November 19th, 2007
Using a Fab House
One of the moderators on Aron’s diystompboxes forum, Peter Snowberg, has repeatedly suggested using a “fab house,” or a PCB fabrication company, to make PCBs. There are lots of reasons for doing this, including convenience, accuracy, and less pollution. I have been wanting to give this a try and waiting for the right project to do it. And I was not sure which company to try. Finally, I took the plunge by sending olimex.com a smaller version of markusw’s 9V electric mistress project that I have been working on. … more …
Sunday, November 18th, 2007
An LTSpice Tutorial
Learning how a circuit works or designing a new one requires experimentation. Besides actually building a circuit, many people use a circuit simulation program. LTspice/SwitcherCAD III is a free program (download link) that many forumites use. Here is a brief introduction to using LTspice, illustrating a calculation with Ohm’s law. This tutorial first appeared on February 27, 2007 on the pre-WordPress version of this site. … more …
Wednesday, November 14th, 2007
Gator Clone
Slow gear volume swells with a special trigger option made the PAiA Gator a unique gate. This work-alike uses updated and more common components than the original unit, which is no longer available. … more …
Monday, November 12th, 2007
1590B Big Muff Build
So dig this: probably the smallest Big Muff you’ll ever see. Chris Gregory (stobiepole) decided to make an all carbon comp version using the Big Muff Pi (Triangle Version) layout. This is a nice example of putting the PCB over the pots. Look at Krister’s Pearl OC-07 Octaver Clone build for another example. View the image in a new window to see a slightly larger version.
Monday, November 12th, 2007
Ground Pour
This is a multi-page tutorial about creating ground pour on an Eagle layout. The picture above shows an example. Note that the ground copper fills in space underneath resistors R1, R2, R4, and R6. It also runs up under the stack of components on the right and in between the +9V trace and C1. … more …
Sunday, November 4th, 2007
A Nice Design for 1590B Enclosures
Some time ago, soggybag (on Aron’s forum) designed a PCB for 1590B enclosures that is very clever. Now the PCB and its image are available on his site, Super-Freq. … more …