BradtheRad
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Today, 01:16BradtheRad replied to a thread Soldering on Battery Terminals in Service Manuals, Requests, Repair TipsIs the question about small AA or C or D cells? These are available with solder tabs (a few dollars each). I confess I solder wires directly to...9 replies | 277 view(s) -
Yesterday, 23:53Perhaps after a few seconds the setting is applied even if you don't press OK? There are store-bought 'universal' remote controls, for use with a...2 replies | 74 view(s)
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14th July 2019, 07:43BradtheRad replied to a thread Tuning of varicap diode in a magnetic loop antenna based on modulating signal in RF, Microwave, Antennas and OpticsYour concept sounds similar to Automatic Frequency Control (or Automatic Fine Tuning), found in many FM receivers going back about fifty years. It...5 replies | 240 view(s)
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13th July 2019, 04:27BradtheRad replied to a thread Does it exist an AC to AC converter in small package for converting 220v to 110v? in Power ElectronicsI've seen advice telling to derate (reduce) power to an inductive load rated for 60 Hz, when you run it at 50 Hz. The reason is because an inductor...24 replies | 639 view(s)
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12th July 2019, 06:35BradtheRad replied to a thread Best books for Current mirrors and differential amplifiers using MOSFFET in Analog Integrated Circuit (IC) Design, Layout and FabricationA differential amplifier is commonly made from a long-tail pair. I needed to experiment with simulations, for hours at a time, to learn its behavior....4 replies | 253 view(s)
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11th July 2019, 14:43A plain red led should light when you apply 1.8v. (There are other colors but they require higher voltage.) It should conduct several mA. Do not...28 replies | 1233 view(s)
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11th July 2019, 04:32The Elementary section becomes an easy choice for many members, rather than to take effort to look over the sections and decide which is the proper...2 replies | 262 view(s)
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10th July 2019, 21:34Your test results appear to prove the concept. The latest plan was to supply 9V power to the IC, but bring 'tree power' into the boost stage,...28 replies | 1233 view(s)
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9th July 2019, 07:15BradtheRad replied to a thread measuring slow oscillations with magnetic methods in Miscellaneous EngineeringFor a coil, the article recommends a telephone pickup coil, or a 9V relay. Small is sufficient. The magnet has to jiggle easily, so it should be...14 replies | 1445 view(s)
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9th July 2019, 03:28BradtheRad replied to a thread measuring slow oscillations with magnetic methods in Miscellaneous EngineeringA Forrest Mims book has an earth-movement sensor project exactly like you describe ('Science Projects' Mini-Notebook, pg 40-41). Suspend the magnet...14 replies | 1445 view(s)
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9th July 2019, 00:18BradtheRad replied to a thread Matching network for low frequency upto 500 Hz in Analog Circuit DesignA simple passive filter (example, resistor & capacitor) needs a certain minimum level of current to drive it. If it loads the incoming signal then it...1 replies | 153 view(s)
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6th July 2019, 02:46David_ started a thread Unsure about this current sensor for use in saturation current measuring circuit. in Analog Circuit DesignHello. I acquired a sensor called S25P050D15X with the intention to use it in a circuit to measure the saturation current of ferromagnetic cores...4 replies | 330 view(s)
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6th July 2019, 00:14By trying various tests you may find an arrangement which creates greater voltage differential, and/or greater current. Examples: * One probe in...28 replies | 1233 view(s)
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4th July 2019, 09:08BradtheRad replied to a thread LTspice model for COB LED in PCB Routing Schematic Layout software and SimulationThe graph shows the LC019D conducting 1A at 37V. Starting out with a simulation, I changed the led to that spec, but it makes the curve too steep...1 replies | 209 view(s)
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4th July 2019, 06:49It's too much for you to expect 100mA from your setup. It's not that different from the store-bought LCD clock powered by a battery made from copper...28 replies | 1233 view(s)
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4th July 2019, 04:32Evidently a lookup table (reference) is stored. The algorithm compares the echo times, together with the lookup table. The result is distance of an...1 replies | 450 view(s)
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2nd July 2019, 09:56You are correct. Temperature change causes readings to drift. I saw this in my own tests as I squeezed the transistor between my fingers. The reading...20 replies | 545 view(s)
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2nd July 2019, 08:56Yes, that sounds like an odd arrangement on the circuit board if the connector has to change the order of the wires. To make progress in fixing...7 replies | 344 view(s)
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2nd July 2019, 02:59You can detect and amplify sense voltage via common-base operation of a transistor. My simulation has 2 milliOhm sense resistance. Even that low...20 replies | 545 view(s)
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1st July 2019, 06:35Did the port become damaged by a device which extracts or forces a lot of current through it? There is a sequence called enumeration, which starts...7 replies | 344 view(s)
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1st July 2019, 03:49BradtheRad replied to a thread measuring slow oscillations with magnetic methods in Miscellaneous EngineeringShine a narrow beam of light onto the moving surface, at an angle so it reflects and creates a dot where you place a photodetector. Arrange your...14 replies | 1445 view(s)
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1st July 2019, 03:16So did this fix the port? Did you match each wire color correctly? The four wires need to be arranged in the correct order. Since you caused...7 replies | 344 view(s)
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30th June 2019, 07:20BradtheRad replied to a thread Adding a light parallel to existing loudspeaker circuit in Hobby Circuits and Small Projects ProblemsThere is a slim chance it's no harm if you steal some signal from the speaker, and run it through a converter to light up led's. This idea can...6 replies | 332 view(s)
About BradtheRad
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- Born 1953. Some college.
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