We have presented the specifications for an endotracheal artificial larynx and discussed the design alternatives we considered to meet these specifications. We have described the basic construction of our larynx and discussed the electronic design in detail. A discussion of the actuation of the valve, the pneumatic and acoustic aspects of the larynx, and its evaluation in dogs will be found in other articles in this supplement. The electronic swallow detector described in this article is capable of reliably detecting swallows, which give rise to pressure signals greater than 5 g/cm2. Its reliability is a result of the temperature compensation of its sensor. This compensation is effective in the range 0 to 45°C. The power requirement of the electronic components is such that frequent charging or replacement of its batteries will be required. This is partially a result of over design of the complex temperature compensation circuit. Future versions of this circuit will focus on the reduction of the power drain by simplifying this circuit. The more radical approach of using a strain gauge sensor will also be attempted.