| 摘要 |
<p>PURPOSE:To start a triangle wave from '0'V at the time of turning on a power supply and to set the polarity of a start point of a triangle wave to the positive or negative side by connecting a control circuit to a triangle wave generating circuit. CONSTITUTION:A control circuit is added to a triangle wave generating circuit 1. The control circuit consists of a circuit 2A setting a time T1, a circuit 2B setting a time T2, a gate 3, a switch 4, an amplifier 5, comparators 6A, 6B, gates 7a, 7b, a FF 8, reference power supply circuits 9A, 9B, and amplifiers 10A, 10B. Then the time T1 is set larger than the time T2. Thus, when a power ON signal 11 rises, the signal is outputted at the time T1 from a monostable multivibrator 2D and the signal is outputted at the time T2 via the circuit 2B for setting the time T2 from a FF 2C, a level at terminals S, R of the FF 8 goes to H and the FF 8 can set a value of a polarity signal 13 to the FF 8. Thus, a triangle wave is always started from '0'V and the polarity of the wave to be generated is selected from any of both positive and negative polarities.</p> |
