BradtheRad
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12th December 2018, 02:26BradtheRad replied to a thread Is there a practical way to tell whether a noise is CM or DM type when using a scope? in Elementary Electronic QuestionsTry watching the signals as an XY display or lissajous plot. When in phase (common mode) the signals form a diagonal line leaning in one direction....14 replies | 390 view(s) -
4th December 2018, 23:20BradtheRad replied to a thread Two soldering irons failed this week. in Service Manuals, Requests, Repair TipsDid your house voltage rise abnormally? That would be a common factor for your two irons. A 10 percent rise in voltage results in 21 percent greater...2 replies | 500 view(s)
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4th December 2018, 18:21BradtheRad replied to a thread Swapping Tx+ Tx- wires in Ethernet communication in Hobby Circuits and Small Projects ProblemsThis might resemble an ethernet crossover cable. Years ago it was the type needed when networking two computers directly. The normal...4 replies | 192 view(s)
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3rd December 2018, 07:49BradtheRad replied to a thread How can I calculate the R and C in CT modulator? in Analog Circuit DesignSelect resistor values which cooperate with the amount of current available from the op amps. Suppose the op amp is rated 20mA output. Then your RC...3 replies | 195 view(s)
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2nd December 2018, 05:24Thread status appears normal in all ways. Readers can view and reply. Updates and notifications sometimes take several minutes for the system to...6 replies | 218 view(s)
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1st December 2018, 07:25BradtheRad replied to a thread How can I calculate the R and C in CT modulator? in Analog Circuit DesignProbably in the area of 1k or 10k ohms. If you choose a very low resistance (say 10-100 ohms) then it leads to high Ampere flow. Or if you choose a...3 replies | 195 view(s)
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29th November 2018, 05:21A servo shows 'jittery' behavior when exposed to inconsistent control signals. (R/C operators often see it when a second operator is transmitting on...6 replies | 390 view(s)
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28th November 2018, 07:05When you run mains AC through a series diode and capacitor, it provides DC waveforms to the load. These rapidly diminish as the capacitor charges....13 replies | 529 view(s)
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28th November 2018, 06:41BradtheRad replied to a thread [SOLVED] need appropriate filtering in Elementary Electronic QuestionsIs this a topology with two transformers? Then the first transformer carries mains AC, while the second transformer carries high frequency AC...3 replies | 217 view(s)
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28th November 2018, 06:22BradtheRad replied to a thread [SOLVED] VCO no oscillation at the output in RF, Microwave, Antennas and OpticsThe schematics I've seen provide a supply wire to the node between the inductors. Your schematic appears to have wires overlapping at that location,...8 replies | 416 view(s)
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27th November 2018, 06:15BradtheRad replied to a thread SMPS 230VAC to 12VDC Testing Using TOP271 ic but this is switching problem in Power ElectronicsYour posts suggest you hear audible noise from your flyback converter. There is a type of faulty behavior that creates On-Off buzzing, as the circuit...8 replies | 440 view(s)
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27th November 2018, 04:54BradtheRad replied to a thread Whirlpool topload washer motor in Service Manuals, Requests, Repair Tips'MCB' = main circuit breaker? Or ground fault interrupter? The GFI is in the wall outlet (in the US anyway). It trips if it detects even a small...2 replies | 450 view(s)
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26th November 2018, 02:37BradtheRad replied to a thread active crossover and passive crossover in Elementary Electronic QuestionsI saw an article telling the benefits of bi-amping: One amplifier for the bass portion (woofer) and another amplifier for the treble portion...6 replies | 431 view(s)
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25th November 2018, 04:36There is the type of notch filter which interacts with an incoming signal. Its frequency components are phase shifted by different amounts. The...3 replies | 250 view(s)
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24th November 2018, 21:02BradtheRad replied to a thread What is the max voltage that a cordless phone may handle above its original rate? in Elementary Electronic QuestionsThere was a time when rechargeable batteries could tolerate carelessness. Cheap 'wall wart' DC adapters usually provided much higher voltage than the...11 replies | 892 view(s)
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23rd November 2018, 04:23BradtheRad replied to a thread [Moved] Do you know sth about Remote LED sensor in Hobby Circuits and Small Projects ProblemsThere is the storebought remote doorbell. It has a pushbutton which you mount next to a door. It contains a battery powered transmitter which sends a...1 replies | 333 view(s)
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22nd November 2018, 05:57BradtheRad replied to a thread Help to design switching circuit for bright and dim led 12V strips in Power ElectronicsThe simple method is a 3-position rocker switch or toggle switch or rotary switch. There is also the single push-button which goes bright-dim-off...2 replies | 188 view(s)
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22nd November 2018, 04:11I have two 'emergency' white led flashlights which are human-powered. They make a sound of a small generator which is probably a dc motor. a)...4 replies | 243 view(s)
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21st November 2018, 03:57Your diagram has DB9 connectors which is associated with an older type of serial interface. It's okay if your computer uses that older style of...2 replies | 303 view(s)
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20th November 2018, 05:47BradtheRad replied to a thread Pico second precision up counter in ASIC Design Methodologies and Tools (Digital)The Josephson Junction has a lot of promise to increase speed of electronic devices, if researchers can find the secret to room temperature...9 replies | 696 view(s)
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20th November 2018, 05:20BradtheRad replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsMine is an original copy (1979) and I still keep it where I can quickly open it up. The 3909 IC is no longer easily available. It was convenient...112 replies | 4203 view(s)
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19th November 2018, 12:27BradtheRad replied to a thread How big should a "big" resistor and capacitor be? in Analog Circuit DesignThe larger the Farad value, the greater current it tries to draw in response to voltage changes. Or to put it another way, a larger Farad value...1 replies | 170 view(s)
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19th November 2018, 07:09BradtheRad replied to a thread [SOLVED] different tesla coil arrangement in Elementary Electronic QuestionsA Tesla coil schematic is in the menu of Falstad's simulator. It has just one capacitor. Although we would expect theoretically a single...3 replies | 239 view(s)
About BradtheRad
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