BradtheRad
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Today, 06:11BradtheRad replied to a thread 750 MHz Band Attenuation Filter in RF, Microwave, Antennas and OpticsSeries LC usually has some amount of neighboring resistance also in series. It reduces Q. LC tank has maximum Q due to slight R. It's easier to...7 replies | 256 view(s) -
9th December 2019, 08:15I think it's okay if you apply 4A at 50 percent duty cycle to each battery. (Don't know about 8A at 25% duty. Or 16A at 12.5% duty.) It's...15 replies | 531 view(s)
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9th December 2019, 02:27It's okay to use mosfets with pwm although their low On-resistance may pass several (perhaps too much) Amperes to the batteries. More so when...15 replies | 531 view(s)
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9th December 2019, 01:30BradtheRad replied to a thread Cadence Orcad Pspice error (no more threads can be created in the system) in Elementary Electronic QuestionsCan you set a value for charge voltage on the output capacitor (and other capacitors)? After power-up, I find that it usually requires many operating...2 replies | 168 view(s)
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8th December 2019, 20:28Simple method to charge two batteries in series, from one power supply. Drive a half-bridge so it alternately provides current to each battery. ...15 replies | 531 view(s)
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8th December 2019, 09:52Simulation showing action of RC in series with source. Various amounts of phase shift are portrayed. Green waveform is voltage. Yellow is current....18 replies | 605 view(s)
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8th December 2019, 06:20The mosfet has an insulated gate with very high resistance. Try calculating the R*C time constant and it tells you what fast frequency you need to...18 replies | 605 view(s)
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7th December 2019, 09:52There is such a thing as a capacitance multiplier. Is that what you made? Test your RC network by applying a wide variety of frequencies....18 replies | 605 view(s)
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6th December 2019, 06:06BradtheRad replied to a thread Charging Voltage for a 1.2V NiMH Battery in Hobby Circuits and Small Projects ProblemsIf you make the battery rise to 2V, then expect it to send such great current through your battery that it heats up alarmingly. It's likely to...11 replies | 512 view(s)
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5th December 2019, 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 | 318 view(s)
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5th December 2019, 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 | 436 view(s)
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5th December 2019, 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...7 replies | 363 view(s)
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5th December 2019, 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...11 replies | 512 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 | 436 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 | 719 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 | 294 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 | 240 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...10 replies | 515 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 | 531 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 | 299 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 | 330 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 | 719 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 | 833 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 | 280 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 | 833 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 | 456 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 | 468 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 | 359 view(s)
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