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hi. i can use three different powerfull switching equipment. These are TIP122 NPN Darlington Transistor(100V 5A), IRF830 TMOS Power FET(500V 4.5A) and TIP3055 Power Transistor(100V 15A). i will connect 10 led serially. and then connect 10 parallel group (each group exist 10 serial led). what...

hi all, in my circuit i need to drive and switch 100 (if it is not enough, may be 1000)led. and i need 20-30 mA for each led. i think that i can drive them serial, parallel or serial-parallel mixed with power transistors. and my driving signal is PWM signal. because of this, i must not only...

Dear Mr./Mrs., I need your help about a problem on my circuit. I am using 74hc123 in order to detect rising and falling edges of square wave signal. I can detect with using 74hc123. there is another function of 74hc123 is to adjust duty length. Square wave's period is 20 ms. i can adjust the...