BradtheRad
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Yesterday, 11:27vivekroy replied to a thread Fractional N Synthesizer - Dual or Multi-Modulus Divider in Analog Integrated Circuit (IC) Design, Layout and FabricationYou can use either. The dual modulus divider will introduce more jitter (due to quantization) than a multi-modulus divider in general. But you need...5 replies | 176 view(s) -
27th January 2020, 09:58vivekroy replied to a thread Is it stable that phase drop to close to 0 but rise to 75 degree when gain is 0dB? in Analog Integrated Circuit (IC) Design, Layout and FabricationWhen the phase shift is close to 180 degrees, you still have a lot of open loop gain. This means that the denominator of G/1+GH can still be written...15 replies | 1311 view(s)
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27th January 2020, 09:45vivekroy replied to a thread indivisual out different from differential output in fully differential amplifier in Analog Integrated Circuit (IC) Design, Layout and FabricationVoltage excursions are fine as long as you are within reliability limits. I don't know if you are worried about aging or not, but these voltage...6 replies | 527 view(s)
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27th January 2020, 05:31BradtheRad replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic Questions56kg is 123 lbs US. Is a manned craft in the works? Experimenters have done this and put up Youtube videos. Some appear genuine as their homemade...18 replies | 1089 view(s)
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26th January 2020, 07:51Your schematic appears to use capacitive drop to reduce current from house voltage, then to feed a simple DC power supply. Although your circuit...2 replies | 264 view(s)
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26th January 2020, 06:28Is your software registered? Is your module registered? Getting success until the crucial moment, then a strange error message appearing might be...2 replies | 205 view(s)
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25th January 2020, 20:55BradtheRad replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic Questions12500W 800V works out to 15A. It seems reasonable considering lightweight lamp cord carries similar current levels. On the other hand if voltage...18 replies | 1089 view(s)
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25th January 2020, 04:15BradtheRad replied to a thread How to choose right PWM frequency for 3 phase ac motor in Power ElectronicsThere's the fundamental frequency and the carrier frequency. The carrier frequency is several times the fundamental. There's no particular formula....2 replies | 208 view(s)
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24th January 2020, 11:01BradtheRad replied to a thread Freq computation without DIV instruction for 8bit MCU in MicrocontrollersConsider creating a lookup table. Say you want two digits of precision... Then you need an array of 100 elements. Exponents are a simple matter of...7 replies | 379 view(s)
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23rd January 2020, 07:53Yes, although its specs should be chosen to suit your system. Ampere saturation rating needs to be much higher than 9A. This simulation is a simple...19 replies | 944 view(s)
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22nd January 2020, 08:00The capacitor Farad value can not be too high of course, lest it pass too much current and destroy itself. Probably 1/10 Watt is reasonable....9 replies | 480 view(s)
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22nd January 2020, 07:39Another possibility is a choke filter. This is useful for smoothing current spikes which are typical with capacitor filters. A choke might go on the...19 replies | 944 view(s)
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22nd January 2020, 05:17thannara123 replied to a thread Require a Desgin of A MOSFET based Switch , for study purpose . in Power ElectronicsSir, Now cleared the doubts learned charactrestics lot of . And I Concluded that the desgin as follows . VDD =12Volt ...21 replies | 1775 view(s) -
21st January 2020, 06:19To illustrate here's a simple simulation of 2000uF charging through resistor and diode from 240 VAC source (peaks=340V). Timeframe 1 second. ...19 replies | 944 view(s)
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20th January 2020, 09:25BradtheRad replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsThis calculates to average 1A current draw, 400 ohms impedance (in round numbers). That amount has to be achieved by reactive impedance (coils with...18 replies | 1089 view(s)
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20th January 2020, 08:32Suppose you pre-charge the capacitors directly from an auxiliary power supply? Install a plain diode and resistor, calculated so caps take a second...19 replies | 944 view(s)
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20th January 2020, 03:32BradtheRad replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsYes, if your load doesn't change resistance in use. Incandescent lamps increase in resistance when they glow. Normally this throws off your...17 replies | 1160 view(s)
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20th January 2020, 02:54Common base mode is suitable. It's tricky to adjust bias voltage and current, in order to find a good operating point. Simple simulation using...9 replies | 651 view(s)
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19th January 2020, 08:25BradtheRad replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsI wouldn't be surprised if the drone has its own step-down converter. High current is needed in R/C aircraft. 25 years ago electric planes typically...18 replies | 1089 view(s)
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18th January 2020, 08:43thannara123 replied to a thread ADC Value gets changed when a Digital output enables in Power Electronicselectrical noise may lead ADC value2 replies | 344 view(s)
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18th January 2020, 06:05BradtheRad replied to a thread Voltage input to BLDC inverters on tethered drone? in Elementary Electronic QuestionsTether wires appear lightweight and thin, implying low Amperes. I imagine it takes from 100 to 300 watts to lift a drone cam. And it seems convenient...18 replies | 1089 view(s)
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18th January 2020, 04:01BradtheRad replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsSimulation of transformer with various loads. Switches were closed in sequence. Scope trace travels to the left. Notice volt reading drops as current...17 replies | 1160 view(s)
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17th January 2020, 17:17thannara123 replied to a thread Require a Desgin of A MOSFET based Switch , for study purpose . in Power ElectronicsHai sir i don't have confusion as you said . I know ohmic or linear or triode region is the low resistance mode of the MOSFET operation. Where the...21 replies | 1775 view(s)
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17th January 2020, 12:01thannara123 replied to a thread Require a Desgin of A MOSFET based Switch , for study purpose . in Power ElectronicsThanks , But then Is the MOSFET works on cutoff and Ohmic region ? or cutoff and stauration region?21 replies | 1775 view(s)
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17th January 2020, 08:20One diode pointing downward provides 0.6V regulated voltage. Two diodes yield 1.2V. (Similar principle to a zener diode.) A safety resistor is...20 replies | 1020 view(s)
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17th January 2020, 07:44BradtheRad replied to a thread Testing Amps on rewound microwave transformer in Elementary Electronic QuestionsOne way is to attach various resistors and measure AC volts. That gives you an idea when the secondary output voltage starts to drop, thus letting...17 replies | 1160 view(s)
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17th January 2020, 04:38thannara123 replied to a thread Require a Desgin of A MOSFET based Switch , for study purpose . in Power ElectronicsHow can i attain in ohmic / Triode region ? As per the data sheet The Vds should be in the range of 2.5volt for the ohmic region. and Vgs is 5volt...21 replies | 1775 view(s)
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16th January 2020, 15:49thannara123 replied to a thread Require a Desgin of A MOSFET based Switch , for study purpose . in Power Electronicsconfused a little :-? Mesuare the Vds when it ON it gives 12mv and 10.5mv for V1 =12v and V1 = 10 respectively .21 replies | 1775 view(s)
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15th January 2020, 17:40thannara123 replied to a thread Require a Desgin of A MOSFET based Switch , for study purpose . in Power ElectronicsAnd Comonly what type of protections are required for a MOSFET.21 replies | 1775 view(s)
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15th January 2020, 15:29I am intrested :thumbsup:11 replies | 994 view(s)
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