Easy peasy
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Today, 11:21Yes 200R pot should be 100k-ohms 470nF cap should be 4.7nF else you will attenuate a lot of the music frequencies ...32 replies | 553 view(s) -
Today, 10:33It would be instructive to try with a battery ( and vol pot turned to zero) to see if the noise was quieter compared to the Meanwell power supply -...32 replies | 553 view(s)
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Today, 06:18Easy peasy replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and Interfacingcorrect - in both pcb's the gnd copper appears to have no connection to the pcb push on connector ...36 replies | 441 view(s)
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Today, 01:44Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects Problemsthe original ckt will be very power limited, at 15VDC in you will be lucky to get +/- 4V across the Tx pri at no load - the volt drop across the...35 replies | 985 view(s)
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Yesterday, 22:13Easy peasy replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and InterfacingI agree the source power supply is likely spiking up when some or all of the relays turn off, a 5W 18V zener should cure it ...36 replies | 441 view(s)
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Yesterday, 21:56Easy peasy replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and Interfacingsorry, wwfeldman, this is not quite correct - capacitors carry AC and spike currents - some times quite large currents, a 10uF cap going...36 replies | 441 view(s)
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Yesterday, 21:43Easy peasy replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and InterfacingIs it - or was it - a tantalum capacitor? these are famous for failures else a high capacitance SMT part with an unknown dielectric - ...36 replies | 441 view(s)
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Yesterday, 21:38Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects Problemstry ali-express for NJW0281 & 0302 ... 1000's there ... but yes the schematic has never been built and tested - otherwise the originator...35 replies | 985 view(s)
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Yesterday, 21:34Easy peasy replied to a thread Using Patent Ideas for Next Product in Elementary Electronic QuestionsTwo approaches: 1) find a patent holder and use their design, offer them a modest fee / royalty - it then becomes their problem to defend...6 replies | 205 view(s)
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Yesterday, 18:03In scope, channels should be set to DC measurement. In your setup, all channels are set to measure AC.15 replies | 192 view(s) -
Yesterday, 08:53Easy peasy replied to a thread Using Patent Ideas for Next Product in Elementary Electronic Questionsyou need to hire a patent attorney, patents last 18-20 years, they can be modified and a new patent issued to take account of the modification - ...6 replies | 205 view(s)
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Yesterday, 08:49Easy peasy replied to a thread Capacitor Burning issue due to unusual reasons in PC Programming and Interfacingwhere is the 10uF cap on the board ...?36 replies | 441 view(s)
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23rd June 2019, 21:56If the power supply rails are "noisy" this may well translate to noise at the output - you mentioned the 12V power was from a meanwell power...32 replies | 553 view(s)
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23rd June 2019, 02:45unfortunately Mr Rutman, the simple ckt you propose will have shoot thru issues at every transition - at least you can turn this one off ...13 replies | 249 view(s)
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23rd June 2019, 01:49Easy peasy replied to a thread Saturation current of coupled inductor used in flyback smps in Power Electronicsyou can also use a standard transformer and put parallel inductance on the o/p winding ...3 replies | 115 view(s)
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23rd June 2019, 01:10getting 400VA out of a voltage multiplier will be a difficult process with high peak currents in the diodes and caps - but you are welcome to try...38 replies | 1628 view(s)
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23rd June 2019, 01:04noise is inherently wide band - there is no notching it out - most noise "filters" are low pass filters, I'm sorry I can't clarify further...32 replies | 553 view(s)
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22nd June 2019, 21:21yes, you may want to try a 2k2 - 10k res in series with the 100pF too, on the LHS of the cap ...32 replies | 553 view(s)
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22nd June 2019, 21:18Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsIn the OP's ckt there is no attempt to modify the square wave into a sine wave, the DC blocking cap biases itself to 6V under normal operation - ...35 replies | 985 view(s)
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22nd June 2019, 09:20Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects Problemsa cmos 555 will drive mosfets pretty well - esp at 50/60 Hz, so I imagine a bipolar one will too ... they just don't last due to the inherent...35 replies | 985 view(s)
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22nd June 2019, 06:22try shorting the input and vary the volume pot from zero to full - if the noise is there and much the same as you vary the pot - then the noise...32 replies | 553 view(s)
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22nd June 2019, 01:33Easy peasy replied to a thread Buck/Boost Battery Charger works on dummy load, but does not charge batteries in Power ElectronicsWe look forward to some full power wave-forms..! - when the Batt is < 11 volts, the turn off Vds looks good - by which I mean there must...70 replies | 2104 view(s)
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22nd June 2019, 01:28Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsOverall the circuit is a poor one, even a bipolar 555 would have trouble providing the base currents needed ( compared to a cmos one - 10mA if...35 replies | 985 view(s)
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21st June 2019, 21:07Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects Problemsfor some one called Audioguru - I am surprised at your statement - if you look closely you will see the xtors are not in saturation - The Vce...35 replies | 985 view(s)
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21st June 2019, 10:44Easy peasy replied to a thread Estimating ripple current of 8 x paralel MLCC 500V 2.2nF for a resonant converter in Power Electronicsbecause volts cannot change instantaneously - the forward recovery is not such an issue ...13 replies | 251 view(s)
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21st June 2019, 08:51Easy peasy replied to a thread Estimating ripple current of 8 x paralel MLCC 500V 2.2nF for a resonant converter in Power Electronics4007 would be a bad choice, 600V with Trr < 35nS a far better choice - TO-220 package, on a heatsink ...13 replies | 251 view(s)
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21st June 2019, 02:49Easy peasy replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects Problemstry NJW0281 and its complement NJW0302 gain approaching 150 for good ones ...35 replies | 985 view(s)
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21st June 2019, 00:21Easy peasy replied to a thread Buck/Boost Battery Charger works on dummy load, but does not charge batteries in Power Electronicssounds like the refresh for the bootstrap gate power is happening on both sides at the same time (?) lowering Rgate with give you bigger...70 replies | 2104 view(s)
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21st June 2019, 00:15Easy peasy replied to a thread High Frequency operation of Three level DC/DC Converters in Power Electronicsgoogle may say it - but the drawing don't show it - that dwg shows a 2 level only ...7 replies | 204 view(s)
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21st June 2019, 00:14Easy peasy replied to a thread Impedance frequency curves for ferrite beads in Analog Circuit Designthe dissipative region is not when the core is saturated - saturation is generally to be avoided if you want best bead performance - a lot of...12 replies | 288 view(s)
About Easy peasy
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- Power Electronics
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- founder MagnetPowerNZ Ltd & Pwrtrnx.com
- Occupation:
- engineer
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