betwixt
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Yesterday, 20:37betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects ProblemsYou should keep C309 and C310 as they are but remove everything before them. The bass will indeed roll off at very low frequencies but I doubt...7 replies | 115 view(s)
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Yesterday, 14:54betwixt replied to a thread Portable headphone amp w. batteries in Hobby Circuits and Small Projects Problems1. about 13mA plus backwards leakage in the regulators (= small) will flow back to the PSU so it would be best to remove the regulators and the...7 replies | 115 view(s)
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Yesterday, 09:19If the LCD only has 4 data lines connected to the PIC it is a 4-bit interface, if it has 8 data lines connected it is an 8-bit interface. Note that...5 replies | 175 view(s)
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20th September 2019, 22:04betwixt replied to a thread Beckman Industrial 9020 - Poor focus with no adjustment in Service Manuals, Requests, Repair TipsTo some of us those are quite low voltages, only 2KV! Seriously, switch it off first and give it a minute or two to discharge capacitors then just...6 replies | 271 view(s)
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18th September 2019, 14:48betwixt replied to a thread Beckman Industrial 9020 - Poor focus with no adjustment in Service Manuals, Requests, Repair TipsYou almost certainly have an open circuit resistor somewhere around the CRT controls. Excessive brightness may also cause the focus defect, it may be...6 replies | 271 view(s)
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18th September 2019, 14:29betwixt replied to a thread Measuring current with ESP32 and Seeed board in IoT - Internet of ThingsI think you probably want full scale reading to be 3.3V, not 5V as you will not be able to measure greater than 3.3V anyway. However, a more...8 replies | 291 view(s)
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17th September 2019, 17:51betwixt replied to a thread Measuring current with ESP32 and Seeed board in IoT - Internet of ThingsIf I understand the original post - the MEASUREMENT is for the load current range up to about 5A but the load may have a brief surge much higher than...8 replies | 291 view(s)
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17th September 2019, 08:45betwixt replied to a thread Change colors of liquid crystal display in Hobby Circuits and Small Projects ProblemsI'm getting confused. Are you trying to produce different hues by rotating the polarizer? You may be able to adjust the shading a little - with the...5 replies | 489 view(s)
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16th September 2019, 11:00From the data sheet: which implies it has an analog frequency discriminator. That means it cannot distinguish signals between two simultaneous...2 replies | 1147 view(s)
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14th September 2019, 13:17betwixt replied to a thread Dimming the MP2489 right down to zero (Buck LED driver) in Power ElectronicsIf I understand the data sheet, the input is always analog but the voltage range is limited to the internal Vref. It gives you the option of...2 replies | 175 view(s)
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14th September 2019, 09:22I think that should win a prize for the most convoluted and un-commented code ever written to do a simple task. When writing a program like that you...3 replies | 218 view(s)
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13th September 2019, 08:51We have no idea what size the pressure gauge is but if we assume it is a standard rotary type with a moving pointer, my approach would be to remove...3 replies | 271 view(s)
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12th September 2019, 22:02The data sheet for the 2N4401 says it should typically drop 0.75V between collector and emitter pins when passing 500mA but you need to give it 50mA...2 replies | 376 view(s)
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12th September 2019, 20:23betwixt replied to a thread Operating four Tx-Rx pairs in close proximity in Hobby Circuits and Small Projects ProblemsI use sequential addressable transmitters with active time of only a few mS, faster than a HT12 can send a single code. Given their close...7 replies | 303 view(s)
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11th September 2019, 09:02betwixt replied to a thread [SOLVED] PIC16F877A controlled 74HC595 by serial command in MicrocontrollersI cannot use Proteus but looking at the code it seems you overflow the receive buffer after a few characters have arrived fro the USART. You usechar...3 replies | 420 view(s)
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11th September 2019, 08:47Almost certainly yes. However, if you use the "lsblk -fs" instead it will also tell you which type of filing system is on the partitions. The...3 replies | 549 view(s)
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10th September 2019, 21:04Windows probably won't help you but if you open a terminal window in Linux try one of these: lsblk -a -fs sudo fdisk -l (lower case 'L') You can...3 replies | 549 view(s)
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9th September 2019, 21:51betwixt replied to a thread Change colors of liquid crystal display in Hobby Circuits and Small Projects ProblemsIt isn't impossible to what you want but it isn't as easy as you imagine. Light falling on the face of the LCD (such as Sunlight) passes through TWO...5 replies | 489 view(s)
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9th September 2019, 21:43A rather vague question. If you fed the top waveform into a low pass filter AND it had the right cut-off characteristics AND it had an appropriate...6 replies | 358 view(s)
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8th September 2019, 14:25If anything I would expect it conduct most of the time. R2/C1 are a phase shift network to delay the trigger voltage reaching threshold and hence...5 replies | 452 view(s)
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8th September 2019, 14:20betwixt replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsI agree FvM but I couldn't think of any other path that would allow only a small current to flow. The series diodes, assuming they are normal Si...15 replies | 825 view(s)
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8th September 2019, 09:14betwixt replied to a thread Lamp Test Circuit with some other indications. in Service Manuals, Requests, Repair TipsLooks like a device for killing LEDs to me. I assume they all have series resistors. Maybe you are seeing leakage through reverse-biased LEDs...15 replies | 825 view(s)
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8th September 2019, 09:05Sorry about the typo - it is indeed 4,320,000 cycles per day. I (in the UK) have never come across a regulator device in the mains supply, the...7 replies | 499 view(s)
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7th September 2019, 21:43I think it is on a much bigger scale. In my area they switch whole power stations on and off to keep the mains steady. We have a 50MW hydro...7 replies | 499 view(s)
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7th September 2019, 13:11Fans draw ("take") as much current as they need. In your case they draw 0.39A each so the total is 1.56A and the 2A adapter should work fine. The 2A...1 replies | 177 view(s)
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5th September 2019, 15:19I have no idea what your schematic and setup is but that isn't what you originally asked for and you didn't do as I suggested. Firstly, please...8 replies | 477 view(s)
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5th September 2019, 08:24betwixt replied to a thread Astable Multivibrator not switching in Hobby Circuits and Small Projects ProblemsSilly values. R5 and R6 serve no purpose but to reduce the available current to the transistor bases. Remove them from in series with the bases...8 replies | 444 view(s)
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4th September 2019, 08:52betwixt replied to a thread LED headlight pcb reverse engineering in Hobby Circuits and Small Projects ProblemsThe schematic doesn't make sense so there must be errors in it I'm afraid. It looks to be a low power headlight, maybe 3W at most so it can't be...1 replies | 236 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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