betwixt
Super Moderator
Home Page
Find latest posts
View Articles
View Blog EntriesMini Statistics
- Join Date
- 4th July 2009
- Last Activity
- Yesterday 14:17
- 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
This page has had 96,253 visits
- Tab Content
- betwixt's Activity
- About Me
- Friends
- Experience
-
Older Activity
-
11th December 2019, 10:19If I understand the requirement and it has to be done digitally, an XOR function of the two signals will produce a high during the time phase...12 replies | 344 view(s)
-
11th December 2019, 10:12betwixt replied to a thread MOC3020/BTA41 circuit problem in Hobby Circuits and Small Projects ProblemsHasan, please start a new thread with your questions as these are not the same as the ones Abuhafss is posting. If shorting LED1 makes it work it...10 replies | 386 view(s)
-
11th December 2019, 00:05betwixt replied to a thread MOC3020/BTA41 circuit problem in Hobby Circuits and Small Projects ProblemsI If the bridge rectifier is directly across the AC it has to bear the full AC voltage, if you place the resistor before the bridge it only has to...10 replies | 386 view(s)
-
10th December 2019, 21:56betwixt replied to a thread MOC3020/BTA41 circuit problem in Hobby Circuits and Small Projects ProblemsNote the different resistor arrangement around the triac! The Chinese design uses a capacitor to filter noise from the gate and to partially snub...10 replies | 386 view(s)
-
10th December 2019, 17:02betwixt replied to a thread MOC3020/BTA41 circuit problem in Hobby Circuits and Small Projects ProblemsTwo points: R4 value looks too low, it is only there to ensure the gate has some leakage current when the output of the MOC3020 is high impedance, I...10 replies | 386 view(s)
-
10th December 2019, 09:56It might work as a strong magnet detector but never as a sensitive metal detector! Metal detectors work by measuring the effect the metal has on a...1 replies | 298 view(s)
-
8th December 2019, 14:29Does your application permit charging one battery at a time? With some MCU intervention and some current steering it is possible to charge one at a...20 replies | 681 view(s)
-
8th December 2019, 12:49There is a clue in the MOSFET symbol about that! I can't understand why you need the 15V. If it is to charge the batteries you can't do it while...20 replies | 681 view(s)
-
8th December 2019, 12:05Doesn't look at all right to me. I'm not sure what any of the circuit really does. D2 seems to have no purpose at all. If the DC-DC converter is to...20 replies | 681 view(s)
-
6th December 2019, 17:09I understand that Klaus but it doesn't increase 10 bits to 12 bits, it just multiplies the result by 4, the LSB will always be zero. The ADC is...8 replies | 452 view(s)
-
6th December 2019, 14:58... and what is the point in multiplying the result by 4? It is still a 10-bit value with zeroes at the end. It may be stored with extra bits but...8 replies | 452 view(s)
-
6th December 2019, 09:47Yes, but with the risk of damaging the meter and possibly the IC at higher signal levels. It isn't a safe strategy. A better approach if you want to...13 replies | 526 view(s)
-
5th December 2019, 21:55If you add a capacitor at the output of the internal amplifier it may go unstable. Check the data sheet for the AD83xx device you choose, there is...13 replies | 526 view(s)
-
5th December 2019, 20:32It has a built in voltage amplifier so all you have to do is add a series potentiometer to limit the meter current. You would need a reference to...13 replies | 526 view(s)
-
5th December 2019, 17:13If you use a 100uA meter you can probably drive it directly from the AD83xx. Brian.13 replies | 526 view(s)
-
5th December 2019, 09:53betwixt replied to a thread How to create a voltage selector circuit in Hobby Circuits and Small Projects ProblemsI thnk a better topology is to feed your voltage to all the comparators in parallel but set a different threshold for each one. The will give you a...6 replies | 330 view(s)
-
4th December 2019, 16:29betwixt replied to a thread VU Meter only with 1LED (PWM) no IC except for OPAMP in Hobby Circuits and Small Projects ProblemsYou can't use the outputs of comparators directly because all you get is an on/off indication of the instantaneous level. You would see the output...6 replies | 292 view(s)
-
2nd December 2019, 17:05betwixt replied to a thread VU Meter only with 1LED (PWM) no IC except for OPAMP in Hobby Circuits and Small Projects ProblemsNot PWM, what you need is an op-amp as a gain stage, a rectifier (either diode or better still an op-amp based precision rectifier) to give you a DC...6 replies | 292 view(s)
-
2nd December 2019, 16:56betwixt replied to a thread Simple 50R I/O RF attenuator (1-30MHz) in RF, Microwave, Antennas and OpticsJust a thought - it is possible to use pre-set potentiometers with plastic center 'screws', either a slot or hex hole? You won't get perfect...14 replies | 504 view(s)
-
1st December 2019, 19:48betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsBased on what we have already said, Carbon dioxide resistors would be best but you might have trouble soldering to them. :) Really, the snubber...33 replies | 1368 view(s)
-
30th November 2019, 09:59They are internally connected together through a copper loop so they should measure as shorted. The load current (or a proportion of it) passes...2 replies | 241 view(s)
-
29th November 2019, 16:30A cheaper alternative might be a low-Q inductance in series with the incoming power. Something like a 50 - 100uH choke with a ~22 Ohm resistor...7 replies | 396 view(s)
-
29th November 2019, 16:26Volatile would be a hint to the compiler to re-read the variable because it could have been changed by the ISR. For example, if your main code was...2 replies | 229 view(s)
-
29th November 2019, 11:46Most components are rated to handle higher current for brief periods so I doubt any damage would occur in any case. There are methods to limit the...7 replies | 396 view(s)
-
29th November 2019, 09:56... and your thermistor tries to drop 2.5 * 10 = 25V as well. First explain what you mean by "it produces sparks" as this is nothing to do with...7 replies | 396 view(s)
-
29th November 2019, 00:35betwixt replied to a thread Building Blocks on an FM Band Receiver in RF, Microwave, Antennas and OpticsAs per FvM, don't confuse FM and AM bandwidth requirements. The deviation of standard FM broadcasts is far wider than the bandwidth of normal 455KHz...7 replies | 405 view(s)
-
28th November 2019, 11:06betwixt replied to a thread Building Blocks on an FM Band Receiver in RF, Microwave, Antennas and OpticsBefore going further - when you say "FM Band" you seem to be referring to the domestic VHF broadcast band (~87MHz to 108MHz) where relatively wide...7 replies | 405 view(s)
-
28th November 2019, 10:59betwixt replied to a thread Converting AF oscillator to use discrete components in Analog Circuit DesignI'm not sure Brad's schematic is a true Wien-Bridge design as it uses different RC values in the series and shunt arms of the feedback loop and it...6 replies | 538 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
- 13,454
- Posts Per Day
- 3.53
General Information
- Last Activity
- Yesterday 14:17
- Join Date
- 4th July 2009
- Home Page
- http://www.atv-projects.com
Helpful Postings
- Has Rated
- 6
- Post Rated
- Rated helpful 4472 out of 4472 times
Experience
Points
- Points
- 82,033
- Level
- 69
Level up completed
- Level up completed
- 83%
- Points required
- 417
Activity
- Activity
- 79.0%
- Activity last 30 days
- 94.0%
- Activity last 7 days
- 96.0%
Points
All Points for user
- Points for User
- 16,920
- Points for Reputation
- 13,144
- Points for every day since registration
- 3,770
- Points for Friends
- 6
All Points for threads
- Points for threads
- 2,810
- Points for Threads
- 100
- Points for Social Group Discussions
- 6
- Points for tagging threads
- 2,445
- Points for replies
- 259
All Points for posts
- Points for Posts
- 62,283
- Points for Posts
- 39,857
- Points for Social Group Messages
- 6
- Points for uploading Attachments
- 40
- Average Posts per Day
- 3.00
- Helpful Answers
- 22,380
All Points for miscellaneous
- Points for Misc
- 20
- Points for posting Calendar Event
- 20
Activities
12th December 2019
- 03:05 betwixt has earned 3 Points for User points
- 03:05 betwixt has earned 11 Points for Posts points
11th December 2019
- 03:05 betwixt has earned 3 Points for threads points
- 03:05 betwixt has earned 12 Points for Posts points
- 03:05 betwixt has earned 1 Points for User points
9th December 2019
- 03:05 betwixt has earned 34 Points for Posts points
- 03:05 betwixt has earned 11 Points for User points
- 03:05 betwixt has earned 1 Points for threads points
7th December 2019
- 03:06 betwixt has earned 9 Points for Posts points
- 03:06 betwixt has earned 1 Points for threads points
6th December 2019
- 03:06 betwixt has earned 7 Points for User points
- 03:06 betwixt has earned 27 Points for Posts points
- 03:06 betwixt has earned 1 Points for threads points
5th December 2019
- 03:06 betwixt has earned 3 Points for Posts points
- 03:06 betwixt has earned 1 Points for threads points
- 03:06 betwixt has earned 1 Points for User points
3rd December 2019
- 03:06 betwixt has earned 6 Points for Posts points
2nd December 2019
- 03:05 betwixt has earned 3 Points for Posts points
- 03:05 betwixt has earned 1 Points for User points
1st December 2019
- 03:06 betwixt has earned 3 Points for Posts points
Show Activities from all Users