betwixt
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Today, 11:24betwixt replied to a thread Increasing oscillator output to almost rail to rail? in RF, Microwave, Antennas and OpticsIt won't work - the circuit uses C9/R2 to create a short 'spike' to clock the '165. It isn't the voltage levels that matter, it is the speed the...5 replies | 89 view(s)
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Today, 09:49betwixt replied to a thread Open collector output arduino with led with PLC inputs problem in Hobby Circuits and Small Projects ProblemsThose parts should be OK but you can use a smaller Schottky diode if you like, it will only carry a few mA at most so a signal type rather than power...5 replies | 248 view(s)
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Today, 09:43betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersThey are optional but I would fit them if possible. They should be as close to the Wroom as possible and be SMD or short wire through hole parts....72 replies | 1979 view(s)
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Yesterday, 09:36Well spotted Klaus - it should indeed by half a cycle, the next zero crossing when the triac turns off is only half the period I quoted. Brian.22 replies | 1458 view(s)
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19th February 2019, 15:57betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersThe MAXIM data sheet explains the interface, it is basically SPI with no data input pin as the device is read only. The SCK is always an input to...72 replies | 1979 view(s)
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19th February 2019, 12:06betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersYou only need one pull-up on each shared line. I'm not sure why you use the 74HC151 like that, to me it would make more sense to use a 3 to 8...72 replies | 1979 view(s)
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19th February 2019, 09:38More information needed: Those motors only need sufficient AC voltage to make them turn, as long as you are using a reasonable frequency (50Hz or...3 replies | 126 view(s)
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18th February 2019, 23:04betwixt replied to a thread Can anyone help with this Tesla coil? in Hobby Circuits and Small Projects ProblemsJust swap the connections to the thick black primary coil. Take the white wire and the green wire and connect them to the opposite ends of the black...3 replies | 142 view(s)
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18th February 2019, 17:42betwixt replied to a thread Can anyone help with this Tesla coil? in Hobby Circuits and Small Projects ProblemsMost likely you have the primary winding the wrong way around. Try reversing the connections to the primary (transistor collector) side and see if...3 replies | 142 view(s)
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18th February 2019, 09:22betwixt replied to a thread RF Transmitter - Pulsing sinusoidal wave @ 10.5K Hz. Pulsed every 36ms in RF, Microwave, Antennas and OpticsThat looks good. You have the wrong symbol for the MOSFET but we can see what you mean and the transistor I recommended is a 2N2222 not 2N222 but...7 replies | 297 view(s)
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17th February 2019, 23:15betwixt replied to a thread RF Transmitter - Pulsing sinusoidal wave @ 10.5K Hz. Pulsed every 36ms in RF, Microwave, Antennas and OpticsThat is almost right. You need two more components, a resistor (10K will do) from the collector of 'SST' to +5V and a capacitor of about 1uF (not...7 replies | 297 view(s)
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17th February 2019, 18:28betwixt replied to a thread RF Detector not detecting cellular phones in RF, Microwave, Antennas and OpticsMy apologies, it wasn't meant to be condescending. The point I was making is that at high frequencies, because the wavelength is shorter, the...24 replies | 809 view(s)
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17th February 2019, 15:39betwixt replied to a thread RF Detector not detecting cellular phones in RF, Microwave, Antennas and OpticsFrom an RF point of view, that is a complete disaster. You really need to understand the concept of wavelengths then closely look at the tracks...24 replies | 809 view(s)
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17th February 2019, 15:25We need to see the full code to be sure but as a guess I would say you have the watchdog timer enabled and are not resetting it. The result would be...4 replies | 161 view(s)
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17th February 2019, 10:19I think the more important question is where does the 580V come from? But yes, it should be suitable otherwise. With the exception of thermal...2 replies | 142 view(s)
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17th February 2019, 10:12betwixt replied to a thread Need to boost 10.5KHz RF transmission distance from 4" to ~25+' in RF, Microwave, Antennas and OpticsThe instructables design will never work efficiently because the current in the loop will be very small. Using whatever method you want to generate...1 replies | 151 view(s)
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17th February 2019, 10:03betwixt replied to a thread RF Transmitter - Pulsing sinusoidal wave @ 10.5K Hz. Pulsed every 36ms in RF, Microwave, Antennas and OpticsPIC10F200 is the device number, it is an 8-pin microcontroller (or 6-pin in SMD package) and the smallest and simplest of all the Microchip MCU...7 replies | 297 view(s)
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17th February 2019, 00:00betwixt replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsYour workbench is supposed to be grounded via 1M already. ...17 replies | 278 view(s)
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16th February 2019, 22:50betwixt replied to a thread Turn on/off hall light with presence detection in Elementary Electronic QuestionsRFID fits all the requirements. All RFID tags have unique serial numbers which you can read so including or excluding a tag at point of entry is just...3 replies | 144 view(s)
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16th February 2019, 22:37betwixt replied to a thread ESD problem solved by using aluminium covered floor tiles? in Elementary Electronic QuestionsLook at it this way: You make an all metal conductive floor and charge it up to 100KV, on it you place a workbench and on the workbench you place...17 replies | 278 view(s)
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16th February 2019, 14:56betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersI'm not sure about the flash, you would have to look closely at the ESP8266 data sheet to see if the timing and page layout is compatible. The one on...72 replies | 1979 view(s)
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16th February 2019, 10:12betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersBeing practical, I would first try some pre-assembled ESP8266 boards at high temperature. Yes, that crystal will work but the chances are one very...72 replies | 1979 view(s)
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15th February 2019, 16:51betwixt replied to a thread [SOLVED] Thermal sensor of a FAN cooler: Needed to identify in Service Manuals, Requests, Repair TipsThe web site is http://www.tayao.com.tw but I can't see that exact model listed. Their catalog is a 17Mb download which would take ages here on my...2 replies | 337 view(s)
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15th February 2019, 15:45betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersTrimmers are relatively expensive and require manual adjustment using a DVM to monitor the voltage. If it is necessary to cater for both batteries...72 replies | 1979 view(s)
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15th February 2019, 10:25betwixt replied to a thread Embedded project needs devices which can work continuously at +125 degree C in MicrocontrollersYou probably don't need the potentiometers, the values are predictable so you should be able to use fixed resistors. I note you have no over-current...72 replies | 1979 view(s)
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15th February 2019, 10:15It is quite likely the same device but pre-loaded in the factory with a specific program for Yamaha. Microchip provide a service where they provide...3 replies | 270 view(s)
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15th February 2019, 10:03venkates2218, I think your problem is not understanding how triacs and SCRs work. Think of them as a switch you turn ON with a pulse at any time...22 replies | 1458 view(s)
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14th February 2019, 22:16Easyrider83 is being a bit harsh (and does not have the ability to ban users!). His comment is quite right though, it is very bad practice to add...7 replies | 226 view(s)
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14th February 2019, 12:52betwixt replied to a thread Anyone please help identify what component is this with t4N marking code? in Service Manuals, Requests, Repair TipsThe only component in SOT23 package with 4N as it's code that I can find is a transistor L2SC4083. It is described as an audio transistor but I...2 replies | 320 view(s)
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