FvM
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Yesterday, 22:25FvM replied to a thread USB differential pair on 2 layer board in Hobby Circuits and Small Projects ProblemsI have no impedance calculator at hand right now, but 40 miles trace width doesn't sound far off. It depends on the minimal clearance that can be...3 replies | 38 view(s) -
Yesterday, 17:23Most PLC systems have either built-in or optional network interfaces and provide different protocols as server or client. What is your PLC system,...2 replies | 50 view(s)
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Yesterday, 10:09FvM replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsI see that the LEDs are populating only a small part of the top side, thus a heat spreading feature may be helpful. The through plated double side...8 replies | 147 view(s)
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Yesterday, 09:59I have used 1/4 W metal film resistors (0207 axial package) and 1/2 W in more rugged designs. Not absolutely necessary.17 replies | 346 view(s)
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Yesterday, 09:44Crystal models have been posted along with oscillator circuits in the Yahoo Ltspice forum https://groups.yahoo.com/neo/groups/LTspice/info mostly by...1 replies | 47 view(s)
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Yesterday, 09:40I'm using the parametric search https://www.microchip.com/ParamChartSearch/Chart.aspx?branchID=300482 replies | 73 view(s)
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15th January 2019, 12:48The stimulation signal timing is the same, but the required reset setup time is obviously different.4 replies | 100 view(s)
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15th January 2019, 09:24dpaul replied to a thread ISE Project navigator while implementation is turned off in PLD, SPLD, GAL, CPLD, FPGA Design@OP, I think your OS is the issue. Read this AnswerRecord from Xilinx: https://www.xilinx.com/support/answers/18419.html None of the ISEs...7 replies | 374 view(s) -
15th January 2019, 08:05FvM replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsThanks for clarification. I didn't yet see this kind of double sided MCPCB. So they manage to isolate the vias from the metal core somehow. Two...8 replies | 147 view(s)
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15th January 2019, 07:55Both simulations are different regarding DFF propagation delay and reset input setup time. We don't know which parameters you put in.4 replies | 100 view(s)
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14th January 2019, 22:20FvM replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsWhat should be the purpose of metal cladding with your board? How can it connect to a heatsink? Multilayer MCPCB can be made, although not so common....8 replies | 147 view(s)
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14th January 2019, 18:01It's obviously a burglar alarm device, indicated by the tamper switch. 15 min delay sounds very unusual for burglar alarm, are you using it for a...6 replies | 159 view(s)
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14th January 2019, 17:33The R value is reasonable 2.2nF. Y2 capacitor won't give much snubber effect, better use X capacitor with 47 nF or 100 nF capacitance. - - -...17 replies | 346 view(s)
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14th January 2019, 15:09No clear values specified for R31 and C10.17 replies | 346 view(s)
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13th January 2019, 23:28FvM replied to a thread Spartan 6 - OSERDES2 to ODDR - Unroutable signals in PLD, SPLD, GAL, CPLD, FPGA DesignThe DDR output register is fed with half the final output data rate. This should allow to use general core registers for the 5:1 serializers. In...4 replies | 245 view(s)
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13th January 2019, 23:08That's an option. It's still rather difficult to interface the SMD transistor package to a heatsink. You can e.g. use massive thermal vias and mount...8 replies | 216 view(s)
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13th January 2019, 17:11You should start to design the transistor heat sinking. 150 A (27 W conduction losses in static operation) won't work on any kind of regular PCB. I...8 replies | 216 view(s)
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13th January 2019, 17:00FvM replied to a thread "Crystal set" radio works only when connected to earth in Elementary Electronic QuestionsThe confusing point is the claim of using a ferrite rod antenna. If it works, radio operation won't depend on an earth connection. I guess,...5 replies | 218 view(s)
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13th January 2019, 16:42It's apparently voltage supervisory application. You would specify threshold voltages for all monitored voltages, e.g. +5V >= 4.75V, -5V <= -4.75 and...17 replies | 415 view(s)
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13th January 2019, 15:09Which circuit? The latest circuit in post #6 has triac MT1 and MT2 interchanged, not correct. The snubber circuit, MOV parallel to RC series circuit...17 replies | 346 view(s)
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13th January 2019, 12:47Regulated SC voltage inverters are available with -1.2V Vref, e.g. lm27761. You may introduce an intentional offset to the feedback path to get lower...13 replies | 464 view(s)
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13th January 2019, 12:15R4 is effectively useless because industry standard triacs have a gate "pull-down" resistor already built in. RC filter R5 + CAP is suggested at...2 replies | 168 view(s)
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13th January 2019, 11:25First point has been clarified, the Sumida datasheets give sufficient information about current rating. Second point is how to read it. Assuming...8 replies | 246 view(s)
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12th January 2019, 16:42The 4 MHz "noise" can't be generated by a slow OP, it must be sourced from the µC or other circuit parts. Seeing so large interference signals raises...13 replies | 280 view(s)
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12th January 2019, 15:16That's a MOV+cap combination, not a RC snubber. Please review also the circuit suggestions in AN3008 for trigger circuit RC filter.17 replies | 346 view(s)
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12th January 2019, 11:33I still believe that the least effort solution for smooth DC braking is applying a low constant DC voltage (e.g. 10% of rated AC motor voltage)...29 replies | 1405 view(s)
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12th January 2019, 11:14No. What do you think is the purpose of specified "temperature rise current" other than a current rating?8 replies | 246 view(s)
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12th January 2019, 11:12Inductive load without suitable RC snubber is likely to cause self turn-on of triac and opto-triac. If it happens that both triacs are turned on, the...17 replies | 346 view(s)
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11th January 2019, 23:30FvM replied to a thread Stacked paralleled SMC TVS's are available? in Elementary Electronic QuestionsDoesn't stacking chips involve series rather than parallel circuit?1 replies | 139 view(s)
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11th January 2019, 23:24You should really tell more about the signal you want to process. How is the problem related to audio? I doubt that "logarithmic scaling" can be...5 replies | 249 view(s)
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