555_TIMER1.CIR Download the SPICE file
Switch OFF → Charge C, Switch ON → Discharge C.
Mode | Switch | What happens? | How? | Time Required |
1 | OFF | Charge C from 1/3 to 2/3 Vcc | RA+RB to Vcc | 0.693∙(RA+RB)∙C |
2 | ON | Discharge C from 2/3 to 1/3 Vcc | RB to GND | 0.693∙ (RB)∙C |
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