BradtheRad
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Today, 06:03BradtheRad replied to a thread How to create a voltage selector circuit in Hobby Circuits and Small Projects ProblemsTry to devise XOR gates (exclusive-OR). A stack of them creates a one-dot graph effect as you need. I suppose you realize you could start with a...6 replies | 196 view(s) -
Today, 05:37BradtheRad replied to a thread LM5642 buck converter not work in Hobby Circuits and Small Projects ProblemsYour schematic appears to be twin interleaved, buck type, synchronous operated. Try starting out with a single basic buck converter. Use just one...7 replies | 337 view(s)
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Today, 04:46BradtheRad replied to a thread Arduino based irrigation controller misbheaving at a particular site. in Hobby Circuits and Small Projects Problems* Try attaching a pulp or pull-down resistor where you see noise at a terminal. 1 Mohm is a reasonable value to start. Don't make it low enough to...6 replies | 209 view(s)
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Today, 04:32BradtheRad replied to a thread Charging Voltage for a 1.2V NiMH Battery in Hobby Circuits and Small Projects ProblemsDuring charging a battery shows a rise in voltage. Even a healthy nicad or NIMH might go to 1.6 or 1.7 V. (When taken off charge it drops to 1.45 or...6 replies | 203 view(s)
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2nd December 2019, 05:05BradtheRad replied to a thread LM5642 buck converter not work in Hobby Circuits and Small Projects ProblemsSometimes a load is needed in order to get any sort of normal operation. Try a resistive load whose value draws 5 or 10 percent of your intended...7 replies | 337 view(s)
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2nd December 2019, 04:18Maybe water cooling is possible? Can you pump water on the enclosure? Or even hang a bag overhead and drip water onto it. A bagful of ice works for a...9 replies | 508 view(s)
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1st December 2019, 06:15BradtheRad replied to a thread Solving for derivative wrt 'variable name', for mode 1 out of 1 for H-field in Electromagnetic Design and SimulationIs this the name of your variable? A variable name is supposed to consist of one word, not two words separated by a space. Or you can make it one...2 replies | 253 view(s)
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30th November 2019, 08:01BradtheRad replied to a thread Automotive toggle switch on PCB solutions? in Hobby Circuits and Small Projects ProblemsOf course it seems economical and efficient to attach the switch directly to the board, however... Do you intend for the switch to be exposed?...1 replies | 203 view(s)
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29th November 2019, 08:57BradtheRad replied to a thread Seeking for zerocrossing switching without using microcontroller in Power ElectronicsTherefore it's a reactive load. It may cause AC voltage crossings to be out of alignment with AC current crossings. Then you're not certain which you...5 replies | 279 view(s)
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28th November 2019, 08:56BradtheRad replied to a thread Converting AF oscillator to use discrete components in Analog Circuit DesignWien-bridge oscillator made from 2 transistors. A schematic is at website: http://www.circuitstoday.com/wien-bridge-oscillator Component...6 replies | 462 view(s)
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27th November 2019, 06:05To produce your desired power and step-up ratio, you'll probably need to make the boost converter draw some supply current at all times. Input...2 replies | 256 view(s)
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26th November 2019, 09:07BradtheRad replied to a thread Steady State average Voltage Simulation in LTSpice in Software Problems, Hints and ReviewsMostly you're interested in Ampere levels through various components. To measure DC current in a wire, install a low ohm resistor (sense resistor)....1 replies | 299 view(s)
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26th November 2019, 03:38Possible options: * Attach a large heatsink which has many fins. To fasten it to the enclosure you may need a high-tech adhesive which is...9 replies | 508 view(s)
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26th November 2019, 03:26For angle less than 42 degrees from horizontal, multiply by ∏/180 to get sine within 10 percent error. Thus 30 degrees x ∏/180 = .5236. Correct...15 replies | 727 view(s)
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25th November 2019, 07:19BradtheRad replied to a thread Need circuit of Charger sans-fill in Hobby Circuits and Small Projects ProblemsYou can get 5V output, by means of a voltage multiplier, or boost converter. One is based on capacitors, the other on an inductor.1 replies | 258 view(s)
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25th November 2019, 05:24We can generate a look-up table of sines from 0 to 45 degrees by starting with .7071 (sine of 45 deg), and taking equal proportions. Thus for 1...15 replies | 727 view(s)
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23rd November 2019, 00:40I persuaded my VIC-20 computer to send to my Macintosh over 2 wires (a null modem arrangement). I did not need to use the handshaking lines. Likewise...5 replies | 397 view(s)
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22nd November 2019, 08:22You are correct. Synchronous type is more efficient and was the type recommended above. I kept my simulation simple by making it asynchronous, with...6 replies | 406 view(s)
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21st November 2019, 06:04BradtheRad replied to a thread What wire is this? Old 2009 TV in Service Manuals, Requests, Repair TipsDo you suspect a broken wire inside a connector? Try to unscrew the barrels on the plugs (called banana plugs in the USA). A broken wire could be...3 replies | 314 view(s)
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21st November 2019, 05:26To follow up on the above suggestions, here's a simulation of quadruple interleaved boost converter. 24V supply stepped up to 60V 50A. As you...6 replies | 406 view(s)
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19th November 2019, 11:00BradtheRad replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and PhysicsBy definition the output which closely resembles a sinewave has the least harmonic content. Or from another viewpoint, the less filtering needed, the...17 replies | 1009 view(s)
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18th November 2019, 09:25BradtheRad replied to a thread Multiple pulse width ( 5 pulses ) inverter and lowest low order harmonics in Mathematics and PhysicsI assume the filter is an inductor or transformer? The tendency is that voltage falls immediately after a pulse ends. I think the aim is to add a few...17 replies | 1009 view(s)
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16th November 2019, 19:54BradtheRad replied to a thread Insertion loss reduction for matching networks in PA design in RF, Microwave, Antennas and OpticsHi - Your Attachment 156523 expired unexpectedly. Unless it is duplicated by your second attachment (thumbnail), you may post again with a new...8 replies | 608 view(s)
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16th November 2019, 17:27BradtheRad replied to a thread [SOLVED] What are the names of these voltages for a 3-ph full-wave controlled rectifier? in Power ElectronicsHi - Your images navigate to an area of the All About Circuits website which requires an account. Please post again and upload each image to Edaboard...4 replies | 411 view(s)
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16th November 2019, 03:08BradtheRad replied to a thread Low and high impedance of low pass stepped impedance filter in RF, Microwave, Antennas and OpticsTelephone companies found it practical to make 600 ohms a standard in various types of circuitry, equipment and measurements, going back decades....2 replies | 272 view(s)
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14th November 2019, 13:28BradtheRad replied to a thread [SOLVED] Differential amplifier measure -32V to +32V with single 3.V supply in Analog Circuit DesignEasy method to attenuate and level shift. Two potentiometers mix a portion of the incoming signal, and a portion of the supply voltage.8 replies | 398 view(s)
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8th November 2019, 08:10Tusharsinh started a thread Altium Width Rule Issue in PCB Routing Schematic Layout software and SimulationI have width rule for power net of 0.5 mm width.What rule i should apply for QFN package which also has power net ,to limit it to the 0.2 mm.1 replies | 320 view(s)
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8th November 2019, 07:19BradtheRad replied to a thread Symmetric Source + 10V and -10V - help me !! in Hobby Circuits and Small Projects ProblemsTo hold to the purpose of the thread title... Here is a simple method to create split 10V supplies from a single 12V supply. Two loads, each...4 replies | 539 view(s)
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8th November 2019, 06:28BradtheRad replied to a thread "Current" controle is a big issue using ClassD ? in Analog Circuit DesignYes, my simulation illustrates the concept in a simple circuit. Adjust component values to yield your desired range of frequencies. Add a...16 replies | 1114 view(s)
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