| 摘要 |
PURPOSE:To ensure generation of the stable pulse train by constituting the pulse train generator circuit with the oscillator to generate the continuous pulses, the counter the pulses, the selector circuit to select the output and the gate to cut off or give the pass control to the oscillator output respectively. CONSTITUTION:With ON of selection switches SN-1 and SN-2, the charge charged to capacitor C2 is discharged. And delay switch circuit 5 output changes from L to H level, and the reset of counter circuit 2 is released. While the L-level signal is supplied to inverter INV1, and thus pulse train selector circuit 6 output changes to H level from L level. As a result, gate 3 is opened, and the output of oscillator 1 is applied to circuit 2 to start counting. Then the output of output terminal N of circuit 2 changes from L to H level via the N-ordered pulse to be applied to INV1. Thus, the output of circuit 6 changes from H or L level to close gate 3, and the pulse train output stops at N-units. With OFF of SN-1 and SN-2, the charging is started to C2 to reset circuit 2 and then to be returned to the original state. |
