Hi,
I am having the following problem. I need to create a variable frequency variable duty cycle 5V square wave signal. The frequency and pulse width need to be adjusted by pots or something of that user friendliness. My current design incorporates 2 555-timer ICs one run in astable mode to get my frequency that I want and the second run in monostable mode for pulse shaping. My problem is with the pulse shaping design. I have it being triggered by the first 555 and it works, however, my frequency range 1-50Hz requires the pot on the duty cycle adjustment to be astronomically large to achieve 3-97% duty cycle at each frequency. I need some IC that accepts the frequency signal from the first IC and creates the duty cycle by a smaller adjustment independent of frequency. I believe I can do the whole circuit with a MSP430 microcontroller, however, I need two designs and if there is an IC out there that does pulse shaping for this application it would be nice.
Thanks for your time
Chris
I am having the following problem. I need to create a variable frequency variable duty cycle 5V square wave signal. The frequency and pulse width need to be adjusted by pots or something of that user friendliness. My current design incorporates 2 555-timer ICs one run in astable mode to get my frequency that I want and the second run in monostable mode for pulse shaping. My problem is with the pulse shaping design. I have it being triggered by the first 555 and it works, however, my frequency range 1-50Hz requires the pot on the duty cycle adjustment to be astronomically large to achieve 3-97% duty cycle at each frequency. I need some IC that accepts the frequency signal from the first IC and creates the duty cycle by a smaller adjustment independent of frequency. I believe I can do the whole circuit with a MSP430 microcontroller, however, I need two designs and if there is an IC out there that does pulse shaping for this application it would be nice.
Thanks for your time
Chris