| 摘要 |
A pulse generator, e.g. for electrical machining such as EDM, is provided which comprises: an on-time setting unit for selectively setting on-times, a first matrix circuit for producing a first output signal on a selected output thereof corresponding to a particular on-time set in the on-time setting unit; an off-time setting unit, independent of the on-time setting unit, for selectively setting off-times; a second matrix circuit, independent of the first matrix circuit, for producing a second output signal on a selected output thereof corresponding to a particular off-time set in the off-time setting unit; a clock pulser for producing clock pulses; a single preset counter for counting the clock pulses; and a circuit for establishing, in the single preset counter, first and second levels to be reached by the clock pulse count in accordance with the first and second output signals, respectively. The circuit is operable, upon the count of the counter in a first mode reaching the first level, to switch the latter to the second level and, upon the count of the counter in a second mode reaching the second level, to switch the latter to the first level, whereby the circuit provides an on-output signal while the preset counter is in the first mode and an off-output signal while the preset counter is in the second mode.
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