barry
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30th March 2020, 23:24barry replied to a thread computer parallel port external relay control in Hobby Circuits and Small Projects ProblemsJust do a search for "USB relays" or something like that, and you'll find lots of stuff, like this:...9 replies | 488 view(s)
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30th March 2020, 20:55barry replied to a thread computer parallel port external relay control in Hobby Circuits and Small Projects ProblemsYou're close enough, Frank. Fire away. What's your question? I'm not really sure what you mean about Microsoft "restrictions". You're free to...9 replies | 488 view(s)
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30th March 2020, 16:48barry replied to a thread Circuit with an integrated FLIP FLOP in Hobby Circuits and Small Projects ProblemsThis is a mess. In "1." you say C goes to 1 when A and B are 1. Then in "3." you say "pin C returns to 1 ONLY when pin A goes from 1 to 0 and then...13 replies | 626 view(s)
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30th March 2020, 16:43barry replied to a thread Is a snubber circuit required with zero-cross optocoupler in Power ElectronicsI think it depends on the application. If you've got an inductive load, where current and voltage are 90 degrees out of phase, you might still need a...4 replies | 298 view(s)
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29th March 2020, 16:52barry replied to a thread [SOLVED] What is the role of this transistor? in Elementary Electronic QuestionsIt’s a current litter.5 replies | 305 view(s)
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26th March 2020, 07:51barry replied to a thread Force sensitive resistor controlling output voltage in Analog Circuit DesignA constant current driving a varying resistance gives a varying voltage. Forgetting about that 50k, when the wiper is near the top of the pot...5 replies | 333 view(s)
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26th March 2020, 07:01barry replied to a thread Force sensitive resistor controlling output voltage in Analog Circuit DesignYour second circuit doesn't make a lot of sense to me. First of all, I think you may damage the FSR with such a high voltage. Secondly, what's the...5 replies | 333 view(s)
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24th March 2020, 22:10You need to know your sensor's voltage(resistance)/temperature relationship. You don't tell us if it's a thermistor, RTD, thermocouple, diode or...9 replies | 558 view(s)
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24th March 2020, 20:18barry replied to a thread My test pattern is not like should be! Somebody can help me please? in PLD, SPLD, GAL, CPLD, FPGA DesignCongratulations! You are today's winner of the vaguest, most meaningless post!! We have absolutely NO idea what you are talking about. Test...9 replies | 557 view(s)
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24th March 2020, 07:29how Old is it? Those sensors do wear out.3 replies | 342 view(s)
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23rd March 2020, 15:34Is it possible you are inadvertently configuring an input pin as an output?6 replies | 433 view(s)
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18th March 2020, 18:37barry replied to a thread capacitive touch sense switch in PCB Routing Schematic Layout software and SimulationIf they are CUSTOM switches, how would anyone besides you know ANYTHING about them???7 replies | 582 view(s)
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15th March 2020, 18:23barry replied to a thread Failure mode of aluminium electrolytic capacitor....open cct..not short cct? in Elementary Electronic QuestionsLet me be blunt: your design approach is questionable at best, dangerous at worst. I would never buy a product designed by someone whose philosophy...5 replies | 545 view(s)
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15th March 2020, 15:39barry replied to a thread Failure mode of aluminium electrolytic capacitor....open cct..not short cct? in Elementary Electronic QuestionsNo, i dont agree. If they polymer caps are adequate, then why use an electrolytic? If they're not adequate, then when the electrolytic fails youll...5 replies | 545 view(s)
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14th March 2020, 21:42barry replied to a thread Dimmer Circuit with Switch Wiring Question in Hobby Circuits and Small Projects ProblemsYou actually bought this? It looks like it was assembled by a pre-schooler. I'd be very suspicious of this entire endeavor.9 replies | 654 view(s)
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13th March 2020, 17:23It could be anything: 12V for the preamplifier, vs 12V for the motor, for example. Without a specific example it's impossible to provide a more...3 replies | 336 view(s)
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13th March 2020, 16:44barry replied to a thread [SOLVED] How to check un-clocked flops and how to trace the source point for the problem ? in ASIC Design Methodologies and Tools (Digital)Ridiculous. This is not a problem of “un-clocked flops”; it’s a problem of design. How do you know there are “un-clocked flops”? Did you run a...12 replies | 811 view(s)
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12th March 2020, 18:10barry replied to a thread [SOLVED] How to check un-clocked flops and how to trace the source point for the problem ? in ASIC Design Methodologies and Tools (Digital)Could you possibly be more vague? We are not mind readers.12 replies | 811 view(s)
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10th March 2020, 00:07barry replied to a thread GBW id different from -3dB frequency in Analog Integrated Circuit (IC) Design, Layout and FabricationGBW is gain times bandwidth. At 48MHz you've got A=1, and that's where it starts to rolloff. (Well, not exactly, since you've got some peaking). GBW...17 replies | 1071 view(s)
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8th March 2020, 17:35Ah, you’re right, I was looking at supply voltage. And output can sink 100ma, so probably didn’t damage that.9 replies | 630 view(s)
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8th March 2020, 07:42Again, you don’t want to connect the output to any voltage above 9V. If you connected the base of the transistor directly to the LM657 output, you...9 replies | 630 view(s)
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8th March 2020, 02:14You don’t have enough base drive to turn that transistor fully on, 33k is way too large. How did you arrive at those values? And you might damage...9 replies | 630 view(s)
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6th March 2020, 15:301) what is “PV”? 2) Do you want to power down the PIC or some external “circuit”?2 replies | 330 view(s)
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