New year, new PCBs

February 25, 2011 at 1:33 pm 2 comments

Okay so it’s February already, but things are finally moving again with the project and a few new PCB’s are on order.

The previous design that we tried used a MIC5891 serial-input latched source driver. This seemed perfect on paper, but turned out not to work at all with 5v USB power because the IC drops too much voltage to drive the LEDs. Dang! And having at least the option to power by USB only is something we don’t want to sacrifice.

The new design by contrast uses discrete transistors to drive the LEDs, which are multiplexed by the microcontroller. This design can take a separate, higher input voltage, but also works fine with 5v. At least it does on the breadboard, we’ll have to wait and see how the PCB behaves!

Delivery is due in early March, news to follow shortly thereafter.

Advertisements

Entry filed under: BlipBox, News and Updates.

BlipBox Circuit Design Changes MidiSerial Utility

2 Comments Add your own

  • 1. floego  |  February 25, 2011 at 2:47 pm

    Great news!

    Reply
    • 2. Patient in Taipei  |  March 1, 2011 at 9:06 am

      yay!

      Reply

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Trackback this post  |  Subscribe to the comments via RSS Feed


Categories

Feeds


%d bloggers like this: