I think you want to say crystall controlled 1 khz frequency and then divide the frequncy usign dividers?Is it possible for 555 timer to adjust 10% duty cycle without affecting the 1 khz frequency?If you aren't too fussy about timing accuracy, arguably the simplest way would be to use a '555 to generate a 1kHz signal with a 10% duty cycle and use that to gate the 27MHz. If higher accuracy is needed then a crystal-controlled 1MHz (for example) oscillator plus frequency divider circuits could generate the mark and space of a 1kHz signal.
No. I'm not aware you can get 1kHz crystals; hence the suggestion to use a 1MHz (or other convenient frequency for which crystals are readily available) oscillator and divide its frequency down to gve a 1kHz signal. Ultimately, that 1kHz is indirectly crystal-controlled though.I think you want to say crystall controlled 1 khz frequency and then divide the frequncy usign dividers?
Thanks for your time and help, you guys are really helpful but the soloution seems very expensive for me as i have to purchase this chip from abroad (digikey)etc however i have arduino and stm32 microcontrollers .How about stm32 F4 or any board to for this kind of problem.An PWM to control duty cycle of an analog switch along with a counter to do the 1000
This is one chip, The BurstEnab triggers the counter and PWM to start. PWM outputs
10% duty cycle. Counter counts 1000 PWM cycles then halts burst and disables gate
signal for 27 Mhz.
PSOC 4, board to do this $ 10,
Only coding is 2 lines instruction to start PWM and Counter, and any
additional code to handle push button trigger cycle for example. If just
another logic signal to start, then just the two lines of code.
View attachment 186110
IDE and Compiler free.
Timing accuracy << 1%, analog gate (say a pin diode for switch or possibly a Jfet) external.
If you want to add adjustable duty cycle just use the onboard SAR and an external
pot to control duty cycle. That adds maybe 5-10 lines of code to handle the A/D pot
value and translate that to duty cycle value to be written to PWM.
Take a look at this.
In this case I was generating on chip sine (audio range of freq) and controlling
burst. This is kind of thing PSOC makes easy to do.
Then you simply count the number of PWM cycles and stop the burst whenThe PWM generation of 10% duty cycle is an easy task i guess from stm32 but i am confused about burst,,?i want 1000 pulses per second of the above waveform as shown in the figure
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by Jake Hertz
by Jake Hertz