| 摘要 |
The timer circuit has the numerical time display function to recognise the lapse of time and the quantity of error. The time is set by a variable resistor (VR1) connecting to a timer IC. The circuit comprises a timer circuit (400) including a SCR (10) and a LED (L2) for displaying the delay time, an oscillation circuit (100) for producing the oscillation frequency, a segment driving section (200), a transistor (Tr4) for controlling the BCD counter (IC2) in response to the signal from the timer circuit, and a display section (300) for displaying the lapse of time. |
