betwixt
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Today, 09:29It seems the initial code (the bootloader) is being loaded but from there it either isn't configuring the SRAM interface pins or it isn't starting...3 replies | 43 view(s)
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Yesterday, 22:13betwixt replied to a thread Klystron output voltage, cavity field strength in RF, Microwave, Antennas and OpticsThis is such a specialized field that I doubt may people would have experience to share. You are probably more likely to get answers by contacting a...2 replies | 188 view(s)
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Yesterday, 22:06betwixt replied to a thread Soldering on Battery Terminals in Service Manuals, Requests, Repair TipsConductive epoxy is loaded with silver powder, not graphite. It can provide very low resistance connections but as it contains real metallic silver...9 replies | 277 view(s)
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Yesterday, 15:10betwixt replied to a thread Soldering on Battery Terminals in Service Manuals, Requests, Repair TipsNo, but it is an alternative that doesn't risk the danger of soldering directly to the battery. Spot welding is probably the best solution if you...9 replies | 277 view(s)
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14th July 2019, 19:13betwixt replied to a thread LNK304 input voltage below the datasheet minimum value...damage? in Power ElectronicsI can't see anything in the data sheet that suggests damage will occur but running it below specified input might have consequences on the regulated...1 replies | 140 view(s)
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14th July 2019, 15:16betwixt replied to a thread Tuning of varicap diode in a magnetic loop antenna based on modulating signal in RF, Microwave, Antennas and OpticsAFC was (until PLL came along) used extensively to keep receiver local oscillators tracking an incoming signal. For receiving, there would be little...5 replies | 240 view(s)
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14th July 2019, 08:43The transformer (converter) should have a rating HIGHER than the console so you are OK. What Barry is saying is there is only at most 3W safety...4 replies | 148 view(s)
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13th July 2019, 22:16betwixt replied to a thread Dirty circuit board causing failure in Service Manuals, Requests, Repair TipsNo, the braid removes the solder by capillary action. The fine spacing between the wires in the braid causes a meniscus to form in the gaps and it's...11 replies | 394 view(s)
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13th July 2019, 09:14betwixt replied to a thread Dirty circuit board causing failure in Service Manuals, Requests, Repair TipsI think we all know point 3 from personal experience :???: Well done for getting it going. If you want to replace the switch, keep the original...11 replies | 394 view(s)
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12th July 2019, 22:43betwixt replied to a thread Dirty circuit board causing failure in Service Manuals, Requests, Repair TipsDesoldering wick is probably the best thing to use for that kind of component. The best temperature depends on the kind of solder you use. The older...11 replies | 394 view(s)
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12th July 2019, 19:08betwixt replied to a thread Dirty circuit board causing failure in Service Manuals, Requests, Repair TipsYou only use hot air for soldering/unsoldering surface mount components (SMD) but all the parts on that board are "through hole" so conventional...11 replies | 394 view(s)
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12th July 2019, 16:46betwixt replied to a thread Dirty circuit board causing failure in Service Manuals, Requests, Repair TipsAll that board holds is a volume control, a switch, an LED and an input jack socket. The switch sends a power signal back to the speakers and also...11 replies | 394 view(s)
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12th July 2019, 14:52betwixt replied to a thread Soldering on Battery Terminals in Service Manuals, Requests, Repair TipsSpot welding uses far less overall heating power. It is intense but only for a very short period. Soldering requires the surface to heat up to...9 replies | 277 view(s)
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12th July 2019, 14:45betwixt replied to a thread copper pour in top layer with vcc net in PCB Routing Schematic Layout software and SimulationTechnically, if you flood with VCC, as far as signals see it the situation is the same as flooding with GND as they should be at the same signal...7 replies | 328 view(s)
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12th July 2019, 10:36betwixt replied to a thread copper pour in top layer with vcc net in PCB Routing Schematic Layout software and SimulationWe have no idea of the design of your controller or the exact PCB layout but in general, there are no reasons why you can't use any layer for any...7 replies | 328 view(s)
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12th July 2019, 09:09We can't answer that without knowing how the coin acceptor identifies the kind of coin inserted. It must produce some different signal depending on...3 replies | 157 view(s)
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12th July 2019, 09:00betwixt replied to a thread copper pour in top layer with vcc net in PCB Routing Schematic Layout software and SimulationThere are no hard rules about this as long as the pour isn't shorting anything out. Beware of things like metal bodied components or heat sinks...7 replies | 328 view(s)
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12th July 2019, 08:57betwixt replied to a thread Dirty circuit board causing failure in Service Manuals, Requests, Repair TipsWarm soapy water is probably the worst thing you could have used, it dissolves the lubricants in the controls and probably introduces new corrosion....11 replies | 394 view(s)
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11th July 2019, 15:34betwixt replied to a thread Wireless door bell Sender not working in Hobby Circuits and Small Projects ProblemsI'm guessing that is the remote sender board, it appears it isn't sending any RF signal or the receiver isn't picking it up. With only two units it...5 replies | 221 view(s)
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11th July 2019, 15:30betwixt replied to a thread dsPIC30F2010 - 30 I/SP restarts at interval of 20seconds for no known reason in MicrocontrollersI'm not that familiar with dsPIC30 series code but a restart at fixed intervals regardless of the coding strongly suggests a watchdog issue. I assume...9 replies | 412 view(s)
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11th July 2019, 15:24betwixt replied to a thread how to design a thermostat without Microcontroller? in Analog Circuit DesignI agree with c_mitra, the relay isn't the problem. The chattering is because the circuit driving it is telling it to turn on and off rapidly. That...84 replies | 3493 view(s)
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11th July 2019, 08:31betwixt replied to a thread how to design a thermostat without Microcontroller? in Analog Circuit DesignIt could be inadequate hysteresis or it could be that the supply line voltage is dropping slightly as the relay operates because of the additional...84 replies | 3493 view(s)
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10th July 2019, 08:56betwixt replied to a thread HELP with Schematics for magnet launcher in Elementary Electronic QuestionsFirstly, make sure you are aware of how dangerous this thing can be. A capacitor bank charged to ~650V can kill so keep fingers well out of the way...4 replies | 403 view(s)
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8th July 2019, 22:19Not enough information. What motor does the compressor use? How is it powered (12V DC, 12V AC or is it 12V from a power supply?) What kind of...3 replies | 136 view(s)
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8th July 2019, 15:29No need to convert to BCD, just create a second array containing the bit pattern of segments and drive the port with it directly. hint: think of...2 replies | 149 view(s)
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8th July 2019, 09:11For accuracy there is no substitute for an ADC. If you have two spare digital pins you could consider adding an external I2C one. If you want...12 replies | 556 view(s)
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7th July 2019, 08:49You could argue that 9V was only necessary to power the control circuits and they are relatively low power in themselves. It is true that if you...28 replies | 1233 view(s)
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6th July 2019, 20:38If you have a 9V supply you can use the MOSFET will work fine. The reason I suggested a BJT is they need a much lower voltage between base and...28 replies | 1233 view(s)
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