| 摘要 |
<p>The main circuit (11) has the magnet coil (12) of a reed relay (13), used as a threshold value switch, connected between the operating contact (16) of the indicator relay (17) and the positive pole. The other side of the operating contact (16) is connected to the changeover contact of the indicator switch (20), (operated by the driver), which in turn feeds the left or right hand indicator lamps (21,22) and the control lamp (23). The main circuit (11) together with the lamps is connected directly to a control unit (24) e.g. microprocessor, containing a pulse generator, test stage (29), sawtooth stage (19) control stage (34) and two registers (35,36). In the circuit, with a pulse generator, a high frequency stability can be maintained since it is insensitive to outside influences such as temp. or voltage fluctuations. Should one lamp fail, an indication is given by an increased flashing frequency.</p> |
