PCB-SMT adaptor boards

Introduction

All the really good integrated circuits are in surface mount packages. The adaptors shown below allow prototyping on standard 0.1 inch headers or with wires.

The boards

We used ExpressPCB software to design the boards and produce them. To open the dsign files, you will need to download software from ExpressPCB. The red and green images below are screen captures from the ExpressPCB design software showing all the connections, text, and header vias. Approximate cost is $59 for three of the boards shown. The cost per adaptor is very competitive.

• Adaptor for Analog devices ADXL 202/203 accelerometers. Each board has 12 copies of the adaptor.
  
  The following image shows the minimal connections for the ADXL203. The ADXL202 requires a 1Meg (or so) resistor on the pads to the left, and two capacitors on the pads to the right to set the time constant of the PWM and analog output.
  
• Mixed adaptor board. This board has adaptors for (top row) SOIC-16 wide/narrow, TSSOP-16, (second row) Radiotronix RCT-433 transmitter, (third row) SOT-23-3 and SOT-23-6, and (fourth row) accelerometer as above. Note that there is improved version of the transmitter adaptor below. Each adaptor in the top row can be used for three different packages, but only one at a time.
  
• Mixed adaptor version 2. This board has adapts SOIC-16 wide/narrow, TSSOP-16, and SOT-23-3 and SOT-23-6.
  
• Adaptor version 3. All are SOIC-16 wide/narrow and TSSOP-16.
  
• Mixed SOIC version. There are SOIC16 wide/narrow, SOIC28, SSOP28, SSOP16, and SOIC8. Each adaptor has two 1206 component mounting pads for bypass capacitors or other components..
  
  


• Mixed SOIC/TSSOP/SOT23
  
• Improved transmitter board. This board adapts the Radiotronix RCT-433 transmitter. There are pads for a bypass capacitor and thru-holes for an antenna decoupling capacitor. I strongly recommend inserting an RF choke in the Vcc line near the transmitter. For 433 MHz, the antenna should be about 18 cm long. See the Radiotronix documents application notes, wireless 101, antennas
  
  An expanded view is shown below. Put a 0.1 uf capacitor on the pads to bypass the power supply.