betwixt
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Today, 08:59betwixt replied to a thread why does output of 74LCX573 go high during powerup in Elementary Electronic QuestionsIn the worst case scenario, you can add a delay to the OE pin and add pull-down resistors at the output but I agree with others, this sounds like a...5 replies | 135 view(s)
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Today, 08:56betwixt replied to a thread [SOLVED] fastening pcb to heasink with studs in Elementary Electronic QuestionsI can't see that it makes any difference whether the stand off is one way around or the other as long as the mounting is secure. The only potential...3 replies | 75 view(s)
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Yesterday, 09:14betwixt replied to a thread [SOLVED] Solder dots on PCB traces in Hobby Circuits and Small Projects ProblemsI would say test points too. Typically a board like that would be tested on a "bed of nails", a fixed platform with locating pins to align the board...7 replies | 267 view(s)
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Yesterday, 09:06betwixt replied to a thread RTC with 7-Segments to display seconds in 2 seven segments in MicrocontrollersNormal practice is to place shared definitions and declarations in header files and to place the working code in '.c' files. You have much of the...14 replies | 311 view(s)
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23rd May 2019, 22:59betwixt replied to a thread RTC with 7-Segments to display seconds in 2 seven segments in MicrocontrollersThe "xc.h" has to be right at the top of the program. It tells the compiler to use the selected microcontroller (in project settings) and associates...14 replies | 311 view(s)
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23rd May 2019, 17:33betwixt replied to a thread RTC with 7-Segments to display seconds in 2 seven segments in MicrocontrollersI only gave it a quick look but you should have "#include <xc.h>< xc.h >" (without the spaces) at the beginning of your program before you assign...14 replies | 311 view(s)
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23rd May 2019, 08:39I'm puzzled by the pins too. TX and RX are crossed over at the interface but why use a soft UART when the hardware one is far easier and uses the...16 replies | 303 view(s)
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22nd May 2019, 20:59betwixt replied to a thread dc to ac coverter circuit not working in Hobby Circuits and Small Projects ProblemsThere is also the issue of reverse voltages across the transistor junctions being too high, particularly with an inductive load. Not a very clever...7 replies | 756 view(s)
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22nd May 2019, 09:08betwixt replied to a thread Can't get digits other than 'zero' in 4-DIGIT 7-SEGMENT DISPLAY in MicrocontrollersI don't use Proteus (or Windows apps at all) but if what Baileychic just said: I would say it is a very poor simulator. I can see why simulations...6 replies | 467 view(s)
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21st May 2019, 23:17betwixt replied to a thread Can't get digits other than 'zero' in 4-DIGIT 7-SEGMENT DISPLAY in MicrocontrollersNot sure why the simulation fails and I do not have Proteus to check. If you built it in real hardware you need a resistor in series with each LED...6 replies | 467 view(s)
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21st May 2019, 22:03betwixt replied to a thread SCR speed brushed DC 180v motor control does not work in Analog Circuit DesignYou can use SCRs but not using PWM, I'll try to explain: PWM = Pulse Width Modulation, in other words the amount of power you want is represented...16 replies | 1407 view(s)
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21st May 2019, 08:38betwixt replied to a thread SCR speed brushed DC 180v motor control does not work in Analog Circuit DesignOpto triacs would be my choice. The gates still won't trigger in the new schematic in any case. Yophi, why are you suggesting PWM? The only way...16 replies | 1407 view(s)
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21st May 2019, 08:28betwixt replied to a thread windows programming to create hex for microcontroller in PC Programming and InterfacingIf you want a hex file without a source file, I guess you are asking for a random number generator. Windows is good at generating random output! ...4 replies | 601 view(s)
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20th May 2019, 08:31betwixt replied to a thread SCR speed brushed DC 180v motor control does not work in Analog Circuit DesignLooks like a recipe for disaster to me. Being part isolated and part live, including live external connections is extremely dangerous unless care is...16 replies | 1407 view(s)
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20th May 2019, 08:26betwixt replied to a thread Electronics engineering contracting under "limited company" or "umbrella" in EDA JobsI've never come across 'umbrella' as a legal term in contracting but there is no obligation to become a limited company if you are a sole trader. ...1 replies | 404 view(s)
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19th May 2019, 13:10betwixt replied to a thread Disconnected Diode in MC34063A Circuit Heating Up in Analog Circuit DesignIt can't. Power dissipation follows Ohms Law, W = Vf * I, and if I is zero so must be the power. If you connected both ends and had it reversed it...2 replies | 337 view(s)
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18th May 2019, 15:16Power sequencing and potential for failure if not sequenced correctly, depends greatly on the individual design. From an electrical aspect, the...2 replies | 566 view(s)
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18th May 2019, 09:57Sounds like you forgot to add the negative feedback. I suspect you really want a unity-gain precision rectifier circuit. An op-amp circuit alone...16 replies | 2012 view(s)
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16th May 2019, 22:57betwixt replied to a thread TTL to AF tone and AF tone to TTL conversion. Ideas, suggestions in Digital Signal ProcessingYou are thinking that the presence or absence of a tone can represent a 1 or a 0 of data. It doesn't work quite like that I'm afraid unless you have...5 replies | 2144 view(s)
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16th May 2019, 15:01betwixt replied to a thread TTL to AF tone and AF tone to TTL conversion. Ideas, suggestions in Digital Signal ProcessingYes, it would work but doing it that way makes it very prone to any signal, no matter what frequency it was. The transistor would switch on with any...5 replies | 2144 view(s)
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16th May 2019, 12:58betwixt replied to a thread TTL to AF tone and AF tone to TTL conversion. Ideas, suggestions in Digital Signal ProcessingMost ASK systems work by switching the power off and on to the oscillator as it is more power efficient but shunting unwanted audio to ground will...5 replies | 2144 view(s)
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16th May 2019, 12:48If the tab and stud have equal heat conduction from them, yes, the whole diode will heat to the same temperature. That is the whole reason for having...1 replies | 755 view(s)
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16th May 2019, 08:39betwixt replied to a thread any solution to amplify the MCP4261 current in Digital Signal ProcessingEven stranger, they want it to control an analog joystick. Attaching a joystick to an SMD IC sounds like a recipe for it being ripped off the board...10 replies | 1347 view(s)
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15th May 2019, 13:21betwixt replied to a thread [SOLVED] Negative voltage needed in K-band in RF, Microwave, Antennas and OpticsI assume as a gate voltage source, the current requirement is fairly low. Use any negative voltage generator IC or use one of the many DC-DC...3 replies | 1334 view(s)
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15th May 2019, 13:18Correct - and expect continuous dissipation of about 4.5W (V * I) so use a 10W resistor for safety and to ensure reliable surge currents. Brian.19 replies | 721 view(s)
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15th May 2019, 10:01betwixt replied to a thread Help in diode code v6 12 Panasonic Plasma TH-P42X30D in Service Manuals, Requests, Repair TipsI have the service manual here but some parts are only referenced as complete boards rather than individual components. What are the component...4 replies | 723 view(s)
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15th May 2019, 08:55These are a fairly rare kind of tube used in some European countries and maybe not familiar to the rest of the World. The tube types beginning...19 replies | 721 view(s)
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14th May 2019, 20:48betwixt replied to a thread Inductance meter (LCR meter) for Qi receiving coil measurement in Power ElectronicsThe inductance doesn't change with frequency or voltage, excepting that some resistive or parasitic parameters may change a little. You can use any...1 replies | 84 view(s)
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14th May 2019, 20:44betwixt replied to a thread Convert RS232 to UART and vice versa (discrete) in Digital communicationMore accurately you can omit the charge pump, all it does is generate the negative voltage to more closely follow RS232 voltage levels. Bear in mind...7 replies | 309 view(s)
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