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Pulse Width and begins Rest Time by setting Out to Low and grounding
Discharge. C2 now discharges through R7, R6, U1 pin7, to ground in the 555
timer, back to C2. When C2 reaches Trigger level Rest Time comes to an end
and we begin the process over again. Formulas for calculating Pulse Width
(PW) and Rest Time (RT) follow (assuming no control Voltage used):
Total Time (T) can be calculated as:
Frequency (f) can be calculated as:
f =
Duty cycle is the ratio of Pulse Width to Total Cycle time, it can be calculated
as:
PW = 0.693 * C2 * (R4 + R5 + R6 + R7)
RT = 0.693 * C2 * (R6 + R7)
T = PW +RT
Or
T = 0.693 * C2 * [(R4 + R5) + 2(R6 + R7)]
1
T =
0.693 * C2 * [(R4 + R5) + 2(R6 + R7)]
R4 + R5 + R6 + R7
DC = R4 + R5 + 2(R6 + R7) * 100%
1
UT5A 9
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