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SA555 датащи(PDF) 15 Page - STMicroelectronics |
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SA555 датащи(HTML) 15 Page - STMicroelectronics |
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15 / 20 page ![]() NE555 - SA555 - SE555 Application information 15/20 Figure 21. 50% duty cycle oscillator Note that this circuit will not oscillate if RB is greater than 1/2 RA because the junction of RA and RB cannot bring pin 2 down to 1/3 VCC and trigger the lower comparator. 4.6 Additional information Adequate power supply by passing is necessary to protect associated circuitry. The minimum recommended is 0.1µF in parallel with 1µF electrolytic. Out RA C NE55 2 4 3 1 5 6 7 8 VCC 51k Ω RB 22k Ω 0.01 μF VCC 0.01 μF |
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