T = tc + td = 0.693R1C1 +0.693R2C1 = 0.693(R1 + R2)C1.......(1) f = 1 T = 1/(tc + td) . ..(2) Using equation (1) (or 2) to find the values for R1 and R2. Use C1 = 9.4 nF and C = 1uF. A. Design a pulse generator for frequencies = 15 KHz, 10 KHz and 5 KHz with a 70% duty cycle. B. For frequency = 200 Hz, generate the waveform for the following duty cycles: 90%, 70%, 50%, 30%, and 10%. Vcc Icharge = lcc R₁ www Reset 4 Discharge Idischarge Threshold 6 Trigger 2 Control S www 8 Vcc R S RST 0 Out 3 Q' 1 Ground Figure 1: Modified oscillator based on 555 Timer IC.

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T = tc + td = 0.693R1C1 +0.693R2C1 = 0.693(R1 + R2)C1.......(1)
f = 1 T = 1/(tc + td) .
..(2)
Using equation (1) (or 2) to find the values for R1 and R2. Use C1 = 9.4 nF and C = 1uF.
A. Design a pulse generator for frequencies = 15 KHz, 10 KHz and 5 KHz with a 70% duty
cycle.
B. For frequency = 200 Hz, generate the waveform for the following duty cycles: 90%, 70%,
50%, 30%, and 10%.
Vcc
Icharge = lcc
R₁
www
Reset
4
Discharge
Idischarge
Threshold
6
Trigger
2
Control
S
www
8 Vcc
R
S
RST
0
Out
3
Q'
1
Ground
Figure 1: Modified oscillator based on 555 Timer IC.
Transcribed Image Text:T = tc + td = 0.693R1C1 +0.693R2C1 = 0.693(R1 + R2)C1.......(1) f = 1 T = 1/(tc + td) . ..(2) Using equation (1) (or 2) to find the values for R1 and R2. Use C1 = 9.4 nF and C = 1uF. A. Design a pulse generator for frequencies = 15 KHz, 10 KHz and 5 KHz with a 70% duty cycle. B. For frequency = 200 Hz, generate the waveform for the following duty cycles: 90%, 70%, 50%, 30%, and 10%. Vcc Icharge = lcc R₁ www Reset 4 Discharge Idischarge Threshold 6 Trigger 2 Control S www 8 Vcc R S RST 0 Out 3 Q' 1 Ground Figure 1: Modified oscillator based on 555 Timer IC.
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