betwixt
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Today, 15:12betwixt replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsA question before moving on: that transformer you are using, does it have a center tap? In other words is it a 12V to 230V type with two primary...14 replies | 331 view(s)
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Yesterday, 23:14betwixt replied to a thread Led project. Led on at nightime. in Hobby Circuits and Small Projects ProblemsThe battery will still discharge eventually. You have to decide on how bright the LED has to be, noting that in general the brighter it is the...13 replies | 374 view(s)
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Yesterday, 13:53You would have to show us your software to be sure but it could be a rounding error due to the math routines or the binary representation of decimal...2 replies | 114 view(s)
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Yesterday, 08:59betwixt replied to a thread Led project. Led on at nightime. in Hobby Circuits and Small Projects ProblemsThose ICs are actually clever, they use an internal oscillator with inhibit input (for daylight detection) and a low Rds MOSFET output switch. All...13 replies | 374 view(s)
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13th June 2019, 20:51betwixt replied to a thread Led project. Led on at nightime. in Hobby Circuits and Small Projects ProblemsFor simplicity, I think I would consider a "Joule Thief" design and single 1.2V rechargeable cell. The on/off control needs be nothing more than an...13 replies | 374 view(s)
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13th June 2019, 08:40betwixt replied to a thread Modulation scheme of this pulsed/two-frequency radar system in RF, Microwave, Antennas and OpticsI'm not certain and I confess I have never seen this method used but I would guess it somehow uses the two frequencies to differentiate between...3 replies | 120 view(s)
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13th June 2019, 08:28betwixt replied to a thread Help wiring a Ne555 Timer delay module (monostable?) in Hobby Circuits and Small Projects ProblemsIf you have a test meter, do a continuity test between pins 1 and 2 of the NE555. Then do the same between pins 8 and 2. In either case, if there...9 replies | 291 view(s)
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12th June 2019, 19:26Sorry, slip of the brain cells, 16" is 400mm not 800mm but still quite a beast. Takes two people to lift it and a ladder to reach the eyepiece. The...13 replies | 368 view(s)
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12th June 2019, 16:458A Schottky diodes are plentiful and cheap. The most current any diode has to carry is 8A, when in parallel mode, each pair of panels has it's own...4 replies | 132 view(s)
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12th June 2019, 09:31betwixt replied to a thread Help wiring a Ne555 Timer delay module (monostable?) in Hobby Circuits and Small Projects ProblemsIf I'm right, the original wiring diagram shows the switch across the normally open relay contacts which are in series with the supply to the board....9 replies | 291 view(s)
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12th June 2019, 09:25It could a faulty components but the environmental conditions are not particularly harsh. Can you show a schematic, obviously something is between...3 replies | 95 view(s)
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12th June 2019, 09:19betwixt replied to a thread O/P not Extected in CAMMON ANODE 7-SEGMENTS in Hobby Circuits and Small Projects ProblemsObvious problems: Electrically you overload the PIC RD0 to RD6 pins, you must fit current limiting resistors in each of them. if(flag>=10) //wait...6 replies | 147 view(s)
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11th June 2019, 20:26Using MOSFETs is quite difficult because the gates have to be lifted close to drain voltage of each device. As the source and drain connections are...4 replies | 132 view(s)
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10th June 2019, 22:38The question is rather like asking "if I fit two engines to my car will it go twice as fast?" The answer depends on so many other factors it is...12 replies | 271 view(s)
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10th June 2019, 13:30I'm glad it's sorted. It would be worthwhile you learning about how partitioning works, it is useful to know for the future. Devices are the whole...18 replies | 544 view(s)
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9th June 2019, 21:58Or a monostable, set to time just over one cycle at 30MHz so anything slower lets it time out. Brian.3 replies | 168 view(s)
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9th June 2019, 21:55if the sensor stays high it continually triggers 1000mS delays so the relay stays on all the time. From your description, I think what you want is...4 replies | 154 view(s)
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9th June 2019, 21:43betwixt replied to a thread Led project. Led on at nightime. in Hobby Circuits and Small Projects ProblemsSounds like a pathfinder for midnight fridge raids. When you say 'nightime' do you mean when it is dark or at particular clock times? Brian.13 replies | 374 view(s)
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9th June 2019, 21:41I've got a 16" (800mm) telescope with opto-electronic guider. I'm not sure what positional resolution it has but as a guess it is around 0.1 degree...13 replies | 368 view(s)
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9th June 2019, 16:36Your logic isn't right: if PIR==1 the relay stays on all the time. Brian.4 replies | 154 view(s)
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9th June 2019, 13:19betwixt replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsIf you assume maybe 30% efficiency then 70% of the power is lost as heat. If that 30% gave you 20W, around 45W would be given off as heat. The...14 replies | 331 view(s)
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9th June 2019, 09:38Yes, re-partition it. The problem is Windows is stopping you do it. Microsoft's assumption that all users are incompetent is the reason I switched...18 replies | 544 view(s)
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9th June 2019, 09:19For such tiny measurements, use a graticule in the eyepiece or a large optical encoder. Even if you could get such precision from a 'cheap'...13 replies | 368 view(s)
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8th June 2019, 17:09As a drive letter is allocated, maybe it is already seeing a single partition. Try formatting it, if it works the partition must be there. Brian.18 replies | 544 view(s)
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8th June 2019, 17:06... but yes, it is now correct. You don't need the resistor on the latch signal if the MCU is actively driving it. Brian.12 replies | 301 view(s)
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8th June 2019, 14:59NEVER leave pins idle, they could adopt any state and change randomly. However your schematic isn't quite right, the ~OE pin enables or disables...12 replies | 301 view(s)
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8th June 2019, 14:22betwixt replied to a thread Tip41c/42c arrangement problem in Hobby Circuits and Small Projects ProblemsIt isn't easy to see but I think it's right. There is more to it than just joining the right places though, you need to be sure the voltage at the...14 replies | 331 view(s)
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8th June 2019, 14:14The 74HC164 is not latched, that is why you found all the relays operated. A latched shift register lets you shift the bits to the desired places,...12 replies | 301 view(s)
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8th June 2019, 11:43Yes, but all you really need is one series resistor and the two diodes, the other components won't stop it working but they probably are not needed....8 replies | 213 view(s)
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