COMPOSITE D.C. AMPLIFIER FOR USE WITH A TOUCH SENSITIVE ELECTRONIC SWITCH

A composite D.C. amplifier for use with a touch sensitive electronic switch which has no moving parts and is actuated by the skin resistance of an operator causing a lowering of D.C. resistance across the switch is disclosed. The composite amplifier, in the preferred embodiment, includes five direct coupled transistors and various current limiting and leakage preventing resistors. The amplifier is arranged to accept an input current on the order of nanoamperes from the touch sensitive switch when actuated and provide an output current in the milliampere range or higher to an electrical load and thus appear as an electronic switch which is in a closed or ON condition. The amplifier is also arranged to avoid providing an output current when the switch is not actuated to thus appear as an electronic switch which is in an open or OFF condition.