Setting the operating frequency with an integrated timer is easy and practical. Following schematic is nothing more than the standard astable mode circuit design with a classic 555. It requires only two resistors and a capacitor to set frequency (with duty cycle of course) and another resistor to determine power transistor’s base current, which you can find it’s optimal value experimentally. I used 1K for R1, 2.2K for R2, and 10nF for C which made circuit to run nearly at 27 kHz theoretically, at %60 high to %40 low duty cycle. You can quickly calculate operating parameters from the resistance and capacitor values with a small program that I’ve written.
Source:http://tacashi.tripod.com/elctrncs/555sstc/555sstc.htm
Thank You.
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This entry was posted on Sunday, December 23rd, 2007 at 10:43 pm and is filed under 555, high voltage power supply, Power supply.
