I need about 5% duty cycle pulse of about 1 sec time period. A second pulse required should be of same characteristics but delayed by a duration by about the 'on' time of the second pulse. ie the first pulse should go on and then the secoond pulse should go on. Need a simple solution please
Cheapest is a microcontroller running on its internal RC oscillator, which you may have more or less calibrated.
If you don't want to use microcontrollers, you can use a 1 Hz oscillator that feeds a monostable that generates 50 ms wide, high logic-level pulses. A second monostable is set to trigger on the high-to-low transitions of the first monostable's output, and also generates 50 ms wide, high logic-level pulses. You can do the whole thing with a 40106 (hex inverter with schmitt-trigger), three capacitors, three resistors and two diodes, as shown in the figure.
http://80.35.195.131/ng/ng_20060623A01.png
R1 & C1 such that period is 1 s. R2 & C2 such that A and B pulses are 50 ms wide. D1 can be 1N4148.
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