betwixt
Super Moderator
Home Page
Find latest posts
View Articles
View Blog EntriesMini Statistics
- Join Date
- 4th July 2009
- Last Activity
- Today 07:47
- Blog Entries
- 0
- Avatar
1 Groups
Join Groups 0 Permission Groups
betwixt is not a member of any public groups
Awards
2nd Helpful MemberAchievements
7 years registeredRecent Visitors
- gayathrim,
- Junaid1996,
- kirschmackey,
- KlausST,
- kripacharya,
- p_wav,
- RandomElectrons,
- savithad,
- UBAIDKHAN,
- Wynge
- Tab Content
- betwixt's Activity
- About Me
- Friends
- Experience
-
Older Activity
-
Yesterday, 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...15 replies | 368 view(s)
-
14th June 2019, 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...14 replies | 407 view(s)
-
14th June 2019, 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 | 131 view(s)
-
14th June 2019, 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...14 replies | 407 view(s)
-
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...14 replies | 407 view(s)
-
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 | 126 view(s)
-
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 | 300 view(s)
-
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 | 371 view(s)
-
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 | 134 view(s)
-
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 | 300 view(s)
-
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 | 104 view(s)
-
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 | 151 view(s)
-
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 | 134 view(s)
-
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 | 282 view(s)
-
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 | 552 view(s)
-
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 | 172 view(s)
-
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 | 155 view(s)
-
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.14 replies | 407 view(s)
-
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 | 371 view(s)
-
9th June 2019, 16:36Your logic isn't right: if PIR==1 the relay stays on all the time. Brian.4 replies | 155 view(s)
-
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...15 replies | 368 view(s)
-
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 | 552 view(s)
-
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 | 371 view(s)
-
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 | 552 view(s)
-
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 | 305 view(s)
-
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 | 305 view(s)
-
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...15 replies | 368 view(s)
-
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 | 305 view(s)
-
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 | 214 view(s)
About betwixt
Basic Information
Optional Info
- Location:
- Aberdyfi, West Wales, UK
- Interests:
- Electronic design, TV production, photography, web site design
- Occupation:
- Retired senior engineer for a test equipment company but still very busy!
Signature
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.
It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.
Contact
Statistics
Total Posts
- Total Posts
- 12,976
- Posts Per Day
- 3.57
General Information
- Last Activity
- Today 07:47
- Join Date
- 4th July 2009
- Home Page
- http://www.atv-projects.com
Helpful Postings
- Has Rated
- 6
- Post Rated
- Rated helpful 4316 out of 4316 times
Experience
Points
- Points
- 79,227
- Level
- 68
Level up completed
- Level up completed
- 65%
- Points required
- 823
Activity
- Activity
- 99.8%
- Activity last 30 days
- 99.7%
- Activity last 7 days
- 99.7%
Points
All Points for user
- Points for User
- 16,508
- Points for Reputation
- 12,822
- Points for every day since registration
- 3,680
- Points for Friends
- 6
All Points for threads
- Points for threads
- 2,572
- Points for Threads
- 99
- Points for Social Group Discussions
- 6
- Points for tagging threads
- 2,210
- Points for replies
- 257
All Points for posts
- Points for Posts
- 60,126
- Points for Posts
- 38,480
- Points for Social Group Messages
- 6
- Points for uploading Attachments
- 40
- Average Posts per Day
- 3.00
- Helpful Answers
- 21,600
All Points for miscellaneous
- Points for Misc
- 20
- Points for posting Calendar Event
- 20
Activities
16th June 2019
- 03:06 betwixt has earned 8 Points for Posts points
- 03:06 betwixt has earned 2 Points for User points
15th June 2019
- 03:06 betwixt has earned 9 Points for Posts points
- 03:06 betwixt has earned 2 Points for threads points
- 03:06 betwixt has earned 1 Points for User points
14th June 2019
- 03:06 betwixt has earned 9 Points for Posts points
- 03:06 betwixt has earned 2 Points for threads points
13th June 2019
- 03:06 betwixt has earned 3 Points for threads points
- 03:06 betwixt has earned 15 Points for Posts points
- 03:06 betwixt has earned 1 Points for User points
12th June 2019
- 03:06 betwixt has earned 3 Points for Posts points
- 03:06 betwixt has earned 2 Points for threads points
11th June 2019
- 03:06 betwixt has earned 5 Points for User points
- 03:06 betwixt has earned 16 Points for Posts points
10th June 2019
- 03:06 betwixt has earned 8 Points for User points
- 03:06 betwixt has earned 44 Points for Posts points
- 03:06 betwixt has earned 3 Points for threads points
9th June 2019
- 03:06 betwixt has earned 5 Points for User points
- 03:06 betwixt has earned 37 Points for Posts points
- 03:06 betwixt has earned 3 Points for threads points
Show Activities from all Users