| 摘要 |
<p>An electronic switch, for closing or opening an electric circuit when contacting a touch electrode, comprising a generator (1) for white noise, whose input is connected to the touch electrode (5). The input circuit of the generator is shunted by a filter (6), which only permits negative transients to affect the generator. The output circuit (4) of the generator is connected to an antenna (3) through an amplifier (2) which also activates an output circuit, but when touching said electrode (5) negative physiological current impulses affect the generator in such a way that due to the feedback through the antenna high frequency oscillations are generated, which oscillations affect a relay or an alarm apparatus through the output circuit (4). The electronic switch is not affected by noise voltages or changes in the input capacitance.</p> |
