Posted in microcontroller

SAM-ICE connector pinout

The pin labeling is in the user guide, but the connector numbering was ambiguous. This photo and table snippet from…

Posted in general electronics

Component Storage

SMD devices like resistors and capacitors can be stored in tiny plastic boxes such as shown here. Make sure the…

Posted in general electronics

SMD soldering

This is a quick tutorial on how to solder an SMD board with 0603 and QFP sized components. This was…

Posted in general electronics

Surface Mount Soldering – Tools

This set of tools is (in my opinion) some great tools for SMT soldering without going the reflow route (which…

Posted in analog audio

Long-tailed-pair oscillator

I needed a quick alarm tone generator for a piezo speaker, and with no 555 at hand, this turned out…

Posted in eagle mixer radio

EAGLE CAD Toroid drawing tool

This small bit of software can auto-generate a toroid outline for EAGLE. You can select horizontal or vertical mounting, and…

Posted in eagle

EAGLE CAD layers reference

This document eagle-cad-layers-reference3.pdf explains what all the layers in EAGLE mean when it comes to PCB component and board design…

Posted in eagle

EAGLE CAD SMD tool

After getting fed up manually creating device packages for EAGLE, the following tool was created. It allows for the automatic…

Posted in radio

Toroid (Amidon) calculations

The excellent website changpuak.ch here andĀ  hereĀ  allows you to figure out what core and number of turns for a…

Posted in radio

Quadrature detector coil

Here are photos of the elusive 235SU1 coils. One will be disassembled in the name of science! It can be…