betwixt
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Yesterday, 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...11 replies | 335 view(s)
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Yesterday, 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 | 156 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 | 214 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 | 312 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...11 replies | 910 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 | 1426 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 | 1426 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 | 1426 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 | 520 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 | 1086 view(s)
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15th May 2019, 13:21I 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 | 928 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 | 517 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 | 591 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 | 517 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 | 79 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 | 290 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 | 290 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 | 517 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 | 172 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 | 172 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 | 1341 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 | 537 view(s)
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11th May 2019, 22:09Try: #define D4 0x04 #define D5 0x08 #define D6 0x10 #define D7 0x20 #define RS 0x01 #define EN 0x02 Brian.1 replies | 488 view(s)
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11th May 2019, 17:01I understand the concept and provided the 'in' and 'out' are directly linked it will send at full speed and over long distances. However, what...3 replies | 989 view(s)
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11th May 2019, 08:26Frequency division with microcontrollers is VERY easy, particularly if the output doesn't have to be a square wave. Almost all MCUs have on-board...17 replies | 619 view(s)
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10th May 2019, 21:36What you are suggesting is quite complicated to implement and I'm not sure it is a fault tolerant as you say. If you can overcome the drive...3 replies | 989 view(s)
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10th May 2019, 21:22CD4059 can divide any frequency up to about 3MHz by any number between 3 and 15999. It is in current production. Brian.17 replies | 619 view(s)
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10th May 2019, 19:16betwixt replied to a thread What role does an element play(shematic question)? in Elementary Electronic QuestionsIt serves no purpose at all in the schematics you show. I would guess it protects against something wrong on the signal driving the enable lines or...5 replies | 272 view(s)
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10th May 2019, 19:11betwixt replied to a thread How to read signal similar to half-wave rectifier output using PIC16F's ADC? in MicrocontrollersAlternative approach: let the voltage charge a capacitor for a period of at least the half cycle, it should then hold peak voltage. Measure it,...11 replies | 306 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.
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