BradtheRad
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Today, 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 | 478 view(s) -
Yesterday, 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...13 replies | 423 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 | 206 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...13 replies | 423 view(s)
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16th October 2019, 06:054-stage chaser (sequencer) made with transistors. It's an extension of a 3-stage chaser whose principle is similar to the classic 2-transistor...11 replies | 414 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 | 205 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 | 175 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 | 271 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 | 415 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 | 574 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 | 177 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,...4 replies | 507 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 | 4407 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 | 308 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 | 346 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 | 277 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 | 420 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 | 694 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...10 replies | 620 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 | 694 view(s)
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7th October 2019, 11:09Capacitive filtering draws short bursts of current. To get 5A output you must supply bursts of current on the order of 30A to 60 A. I*I*R losses are...10 replies | 620 view(s)
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6th October 2019, 03:47BradtheRad replied to a thread High Speed Motion Sensor of Object in Professional Hardware and Electronics DesignQuestions: * Do you wish to detect if the pitch is in a strike zone directly above the plate (about 12 inches wide)? * Is a bat or batter's arm...4 replies | 1271 view(s)
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2nd October 2019, 06:41BradtheRad replied to a thread "Self-Healing" 12V 30A Circuit in Hobby Circuits and Small Projects ProblemsAn article about self-healing circuits suggests it's for complex systems with sensors that detect a problem growing, and re-route or shut down...6 replies | 971 view(s)
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2nd October 2019, 03:04The grid dip meter is a useful instrument for radio enthusiasts. It's popular because it's possible to build your own from a few discrete components....13 replies | 805 view(s)
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2nd October 2019, 01:49BradtheRad replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsI believe your observation which demonstrates that moving the center of gravity starts a swinging motion. The apparatus must obey the force of...84 replies | 3503 view(s)
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2nd October 2019, 01:07BradtheRad replied to a thread How to get two Sweep and Repeat Generators in sync. in Mathematics and PhysicsMany types of oscillators change frequency if you change supply voltage. Or you can 'bend' an RC time constant by changing a resistance somewhere in...2 replies | 253 view(s)
About BradtheRad
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- Born 1953. Some college.
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