Field effect transistor amplifier

A transistor amplifier using a semiconductor-electrolyte interface modulated by an electrical field has been developed by J. F. Dewald of Bell Telephone Laboratories. Recent laboratory experiments have demonstrated amplifier operation at 1,000 cps (cycles per second) with gain in exsess of 15 db. Initial work on conductivity modulation at a semiconductor-electrolyte interface was carried out at the company´s laboratories more than 10 years ago during early studies of transistor action. At that time, minority carrier injection at small area contacts was discovered, leading to the first point contact transistor.