BradtheRad
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Today, 07:20This driver starts with a square-wave oscillator. Frequency is adjustable. (It does not auto-detect resonant frequency.) You must find a frequency...5 replies | 389 view(s) -
Yesterday, 09:41My schematic illustrates a concept of operation, an automatic method to detect resonant frequency. Where I have a series LC, there needs to be the...5 replies | 389 view(s)
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21st October 2019, 06:56BradtheRad replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsAnd yes, I pointed out that formula entering the picture in my post #17. So let's see if things are clearing up. I compared more variations to see...24 replies | 1157 view(s)
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19th October 2019, 04:05BradtheRad replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsEven if I were experienced at calculations with imaginary numbers and complex impedances, it's obvious I would need to learn more in order to account...24 replies | 1157 view(s)
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18th October 2019, 14:42BradtheRad replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsYes, it would all be simpler if I'd seen only the calculator at the 'allaboutcircuits.com' webpage (post #2). 1/(2 ∏ f C) The XC formula would be...24 replies | 1157 view(s)
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18th October 2019, 08:28Is this question the same as in your recent link below? Did you try suggested methods? "BLDC motor delta winding" ...2 replies | 216 view(s)
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18th October 2019, 06:16BradtheRad replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsHere's the second half of my simulation. I increased ohmic resistance to 77 ohms, to see if capacitive impedance still indicates 77 ohms according...24 replies | 1157 view(s)
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18th October 2019, 03:58A full H-bridge is the convenient method to create AC from a single DC supply. It's a variation of the astable multivibrator. You can adjust...5 replies | 389 view(s)
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18th October 2019, 02:35BradtheRad replied to a thread [SOLVED] Wiring of DC fans in Series in Elementary Electronic QuestionsCall this a 'quasi' buck converter, balancing voltage to two dissimilar loads in series. (Without it the loads receive 22.5V top, 7.5V bottom.) ...20 replies | 926 view(s)
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17th October 2019, 02:39BradtheRad replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsWhen there is negligible ohmic resistance, it's true that the capacitive reactance formula tells the impedance. However if the resistor value...24 replies | 1157 view(s)
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16th October 2019, 07:51One thing to consider is whether your device does something bad in the event that supply voltage drops to 3V? Example, loss of data in memory? Do...5 replies | 331 view(s)
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16th October 2019, 07:31BradtheRad replied to a thread [SOLVED] Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsNot in all cases. There is a difference due to a phase change. The calculation needs to be fine-tuned by drawing parallelogram angles as shown in...24 replies | 1157 view(s)
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16th October 2019, 06:05BradtheRad replied to a thread [SOLVED] Generation of 4 Phase Shifted clock Signals in Analog Circuit Design4-stage chaser (sequencer) made with transistors. It's an extension of a 3-stage chaser whose principle is similar to the classic 2-transistor...12 replies | 649 view(s)
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15th October 2019, 07:57BradtheRad replied to a thread Zener diode simulation problem using multisim 12.0 in Elementary Electronic QuestionsDid you try a similar circuit from the examples folder? Did the same problem appear with simpler circuits? Say, a resistor and voltage source? ...5 replies | 290 view(s)
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15th October 2019, 06:03For an easy thing to try, install a resistor to isolate the sensitive device from the noisy supply. Add a reservoir capacitor as shown below. ...3 replies | 233 view(s)
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14th October 2019, 06:17BradtheRad replied to a thread Regulator strategy - embedded system power design in Power ElectronicsYou're probably interested in a switching power regulator. A buck converter can give efficient performance. If you really want to obtain 3.8V from...3 replies | 333 view(s)
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14th October 2019, 01:01BradtheRad replied to a thread Desperate for help (computer fan control) or this could cost huge $$$ in Hobby Circuits and Small Projects ProblemsTo know what's going on you must monitor several readings. You need to know what volt levels go to the fan. You must confirm temperature of the...7 replies | 521 view(s)
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13th October 2019, 19:58Look at the symbol of a balun very carefully and you will see what we mean.9 replies | 678 view(s)
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13th October 2019, 19:56vivekroy replied to a thread question about Friis equation with very large antenna gain in RF, Microwave, Antennas and OpticsExactly as FvM mentioned. If Pr/Pt > 1, then it would also mean lambda/4piD >1 ==> D<lambda/4pi But by definition, far field extends upto infinity....2 replies | 225 view(s)
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13th October 2019, 07:01BradtheRad replied to a thread Can IP(Intellectual Property) open source, what does good business model? in ASIC Design Methodologies and Tools (Digital)Not that I speak from business know-how, but I have a hunch that a programmer who demonstrates excellence (without pay) in view of the community,...6 replies | 695 view(s)
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13th October 2019, 04:59BradtheRad replied to a thread Magnetic flux conduit for flux concentration? in Mathematics and PhysicsThis topic is interesting however eddy currents are invisible and tend to do the unexpected. I'm still trying to get my mind around the way a...21 replies | 4623 view(s)
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10th October 2019, 06:34BradtheRad replied to a thread Simple question on Transresistance Amplifier circuit in Analog Circuit DesignIn some cases you may wish to apply some amount of bias to your photodetector, to bring it to a threshold where it responds reliably to a trigger...5 replies | 395 view(s)
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10th October 2019, 06:22BradtheRad replied to a thread multiple channel "DC OK" signal ANDing with galvanic isolation in Analog Circuit DesignDiode logic can be used as long as your range of voltage is such that one low vote affects the resultant signal causing it to be pulled low. It can...2 replies | 396 view(s)
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10th October 2019, 06:02BradtheRad replied to a thread Algorithm to estimate given battery chemistry and capacity in Power ElectronicsI have not heard of a smart charger which is able to detect Amp-hour capacity of a random cell. It's a bad idea to charge a cell unless you know...3 replies | 339 view(s)
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9th October 2019, 06:44Vout is a percentage of Vin. The formula is: (4700 + Z) divided by (50M + 4700 + Z) To find Z, make the above formula equal to your desired...5 replies | 510 view(s)
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9th October 2019, 01:49BradtheRad replied to a thread Tools to detect AC electric leakage/loss in home electricity in Elementary Electronic QuestionsThere are sensitive meters which detect live wires behind walls. Sold as '3-in-1' wall scanners. Inexpensive ones cost $13-20.6 replies | 782 view(s)
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8th October 2019, 06:49With load absent, an unregulated supply tends to rise to the maximum amplitude coming from the transformer. This is true whether filtering is choke...12 replies | 845 view(s)
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8th October 2019, 06:20BradtheRad replied to a thread Tools to detect AC electric leakage/loss in home electricity in Elementary Electronic QuestionsYou can measure current draw of some appliances, but other appliances have an On-Off cycle. Those could use some kind of time-logging device. I...6 replies | 782 view(s)
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