betwixt
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Today, 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...7 replies | 121 view(s)
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Yesterday, 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 | 720 view(s)
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Yesterday, 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 | 334 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 | 334 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 | 1295 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 | 1295 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 | 492 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 | 1295 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 | 325 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 | 330 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 | 550 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 | 1867 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 | 2104 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 | 2104 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 | 2104 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 | 745 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 | 1208 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 | 1267 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 | 630 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 | 711 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 | 630 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 | 83 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 | 301 view(s)
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14th May 2019, 15:56betwixt replied to a thread Convert RS232 to UART and vice versa (discrete) in Digital communicationTechnically FvM is correct (isn't he always!) but you might be able to bend the rules a little. For conversion of RS232 to TTL, add a resistor...7 replies | 301 view(s)
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14th May 2019, 09:30I wouldn't connect them directly across the mains, the surge current would probably kill them very rapidly. The idea of fixed current/various voltage...19 replies | 630 view(s)
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14th May 2019, 09:22betwixt replied to a thread TCM3105 what happens if data is sent at a higher rate? in Digital communicationCorrect - the different mode settings change the frequency pairs and maybe filtering but not the bit rate. It's worth considering how much audio...5 replies | 181 view(s)
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13th May 2019, 23:09betwixt replied to a thread TCM3105 what happens if data is sent at a higher rate? in Digital communicationBased on the TI data sheet, it should work at almost any speed as it doesn't time the frequency shifts, it just responds to them as they happen. It...5 replies | 181 view(s)
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13th May 2019, 10:09First - I have to say I have no expertise in this field but I would say I have a good mind for lateral thinking, finding less obvious solutions to...5 replies | 1628 view(s)
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12th May 2019, 23:02betwixt replied to a thread UART-->RS485 (transmission is finished and it may respond) in Digital communicationSettling time for the idle condition is all I can think of. The protocol shouldn't matter as the device is only a driver, the output should follow...24 replies | 569 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
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