TOUCH ACTIVATED DC SWITCH AND PROGRAMMER ARRAY
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Abstract
A solid state momentary switch device which responds to the touch of the human body and includes an SCR whose power terminals are connected in series with a source of electric power and an electric load. Also included in the series circuit is a time constant arrangement in the form of a current flow control means which automatically varies its impedance between a high and a low impedance state. This arrangement consists of a resistor large enough to reduce the current flow to below that required for maintaining discharge through the SCR and a capacitor which presents a low initial impedance during charging and a high impedance after it is fully charged. The gate terminal of the SCR is arranged to be contacted by the human body through an isolating impedance and a low pass filter is interposed between the control terminal and a power terminal. The touching by a human body supplies an AC signal from the body to the control terminal. The invention also comprises the use of the switch circuit in various sophisticated manners such as in parallel with different time constants and also in a controllable latched ON-OFF configuration.
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