There are currently no etched boards or etching layouts available. But here’s a detailed plan for a breadboard. Soldering that shouldn’t take longer than soldering a premade one.

Download the PDF plan from below to get started, it contains also a list of needed parts. If you have FreeHand, you should definitely also download the source, because you can switch the visibility of layers. However, the PDF contains multiple views of the Breadboard Construction, so it should be easy to rebuild.

The RS232 Section is optional.

Never connect RS232 signals from your PC directly to the SpeakJet!
Because RS232 is operated with 12V and the SpeakJet just deals with 5V, you will likely damage it!

To turn the SpeakJet IIC Module into a fully operateable synthesizer, you need this:

• 1 Core-Module (PIC18F)
• 1 SpeakJet IIC Module (PIC16F, MAX232 and SpeakJet)
• optional 1 LCD
• optional Amplifier circuit

These steps are required:

• Soldering the core module
• Building the Speakjet iic module
• Adding an additional 1k pull-up resistor between Vd and SC at CORE::J4 (to allow “clock stretching”)
• Burning the speakjet_iic firmware to the PIC16F Microchip (requires a MBHP-Burner module together with a 18-to-40 pin adapter made out of two IC-Sockets)
• The Core runs with MIOS (default Bootloader), PIC18F Chips from SmashTV or Mike’s Midishop are compatible!

If you haven’t already done, read this page:

• IIC SpeakJet Module ^uCApps

Then you need to download the plan (it also contains a list of needed parts!):

• Preliminary Breadboard with lowPassFilter (PDF, 480 kB)
• Preliminary Breadboard with lowPassFilter (FreeHandMX sourcefile with a lot of nice electronical symbols and layer visibility toggles!, 292 kB)

Here is a Picture Gallery that shows the process of soldering the breadboard along with some final pictures from different views.

Don’t cut the legs at once, use them to build the paths at the bottom!

I tried to make the board as small as possible, but there should be enough space to add additional pins if necessary.

You’ll need the MBHP-Burner and build an adaptor from 40pin to 18pin:

• http://www.ucapps.de/mbhp_iic_midi.html ^uCApps – among description of the adaptor, you will find useful informations (ID-Jumper, IIC...) on this side. read it!
• Schematic 18pin adaptor for Burner ^uCApps (PDF)

Set the burner to 13.1 V (for PIC16; if you’re burning PIC18 use 12.5 V)

(to come)

• speakjet control overview
• speakjet definition list
• speakjet frequency definition list