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Recent content by caringin

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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Re: PWM voltage dropped Hi Davood, Why if I calculate PWM voltage, I use V average? Why not using V rms? Do you have any reason about it?
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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Re: PWM voltage dropped Hi, What is the different if I use PWM 1kHz 75% and 100 Hz 75%? Is it true that the voltage is different? Or maybe the energy supplied to motor DC is different? Any comment?
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    Spark in trafo output

    Hi, I need help using trafo. I use trafo 1 A, 18 V. After I unplug the cable from 220 V AC, there is still DC voltage output from the rectifier section. I must short circuit the capacitor to empty the capactior. Do you know why? It is very dangerous, I guess, you know the result when you short...
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    Zener regulator question

    Hi, Unfortunately, I didn't know the power can be delivered to the Zener. The store didn't tell me anything about it. I just asked for Zener 5.1 V. Maybe I have blown the Zener up because I once directly connected the Zener to battery 9 V. I didn''t know that it's forbidden, but I don't want to...
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    Zener regulator question

    Hi, I use Zener 5.1 V in my recent design. At the beginning, my design works succusfully, but yesterday, it didn't work. I looked for the error and I tried to change the Zener and it now works. My question is, what is the maximum voltage can be given to Zener 5.1V?
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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Re: PWM voltage dropped Hi, I am sorry, I didn't notice that. The datasheet said 600mA OUTPUT CURRENT CAPABILITY PER CHANNEL Does it mean that 600mA is fixed? I measure the current on OUT1 and the current is only 70mA.
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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Re: PWM voltage dropped Hi, I guess you're right, but with or without DC motor isn't it the same voltage between OUT1 and OUT2 if using the calculation you gave? The actual is different, without DC motor, PWM 100% is 12V. With DC motor is 9.5V. How can you explain this? Do you have any...
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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Re: PWM voltage dropped Hi, Changing 12V up to 15V is my last alternative. But, the reason why the voltage dropped to 9,5-10V when the DC motor is connected is a big question for me. The wire is fine, none is acting as resistor I guess. A friend told me that calculating VDC is the average of...
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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Re: PWM voltage dropped Hi, Do you know how to calculate the voltage of DC motor with PWM duty cycle 50%, 75%, 100%? For example, duty cycle 50% of VIN=12V is 6V, is this correct? I think it is due to impedance matching. I measure the resistance between OUT1 and OUT2 without connecting it to...
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    PWM voltage drop in a motor controller (AT89S5 and L293 H-Bridge)

    Hi, My recent project is to design motor controller using PWM. I use AT89S5 and L293 H-Bridge as the motor driver. The DC motor is 12 V (DC motor with gear box). If I connect to DC motor, the voltage with 100% PWM dropped to 9.5 V. If I don't connect it to DC motor, the voltage is still 12 V...
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    width of routing trace

    Hi, I'd like to design a PCB (single layer) using Protel99_SE. I'm still confused, how is the preferred of the width of routing trace for signal and power? How to set it in Protel99_SE? And how to create ground plane? Thanks.
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    Ground Analog and Digital

    Hi, I use IC motor driver, L293D H-bridge. Do I still need to use bypass caps? Do I also need optoisolator to separate output from the micro and the H-bridge? A friend told me that there is a chance that high current from H-bridge flows enter the micro? I use 12 V for H-bridge and 5 V for micro.
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    Ground Analog and Digital

    Hi, I want to make a PCB for my design. It consists of Microcontroller, Analog-to-Digital Converter, motor driver, and amplifier. Should I separate their Ground since the micro is digital and the others are analog? Thanks.
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    Electret microphone to ADC input

    adc for microphones Hi, I have connected the ground as you told me so, but it was still the same. I have also used ferrite bead to separate the digital and analog GND and nothing went better. I use microcontroller to process the output of ADC. Do you have any experience having sound as the...
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    Electret microphone to ADC input

    lm741 schematic adc I mean that when it's quiet (no sound), the ADC still went random. No, I want to make sound controller, but only intensity of the sound, not the frequency as the sensor.
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