| 摘要 |
<p>The control circuit for a heating system includes an operational amplifier as a comparator, with its non-inverting input controlled by external temperature and its inverting input connected to an arrangement of a D/A converter binary counter, time and NOR gate as in the main patent. Timing is controlled by a trigger circuit connected alternately to the comparator and to the output of the counter. This trigger stage has two transistors with the base of one transistor connected by a resistance to the power supply. This is connected to a branch with two resistances of the same value which connect the other transistor with the other drive connection when conducting.</p> |
