betwixt
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Yesterday, 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...12 replies | 252 view(s)
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Yesterday, 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...12 replies | 252 view(s)
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Yesterday, 17:13If you use a 100uA meter you can probably drive it directly from the AD83xx. Brian.12 replies | 252 view(s)
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Yesterday, 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 | 202 view(s)
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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 | 216 view(s)
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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 | 216 view(s)
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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 | 400 view(s)
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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...23 replies | 1072 view(s)
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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 | 194 view(s)
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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 | 311 view(s)
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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 | 185 view(s)
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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 | 311 view(s)
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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 | 311 view(s)
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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 | 340 view(s)
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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 | 340 view(s)
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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 | 466 view(s)
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25th November 2019, 22:19You are quite right to correct me FvM - put my mistakes down to old age. They say your memory goes first ...... and I can't remember what comes...15 replies | 728 view(s)
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25th November 2019, 14:34betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsPerhaps they need one of these: https://www.ttvjaudio.com/The-Ultimate-Electrostatic-Headphone-Set-up-p/hif1230008.htm Thankfully it has free...23 replies | 1072 view(s)
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25th November 2019, 14:22First thing to check is whether you really have a controllable volume at all. There are three type of TDA7052, the original with no letter at the...6 replies | 441 view(s)
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25th November 2019, 10:29betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsI do not doubt any of the technical explanations about diode recovery time and how to snub the spike but I do have reservations about how relevant it...23 replies | 1072 view(s)
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25th November 2019, 10:07Symmetry - 32 points in 45 degrees means (360/45)*32 = 256 points in total. An average of a little over 1 degree per point but also a convenient...15 replies | 728 view(s)
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24th November 2019, 13:05betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsNot necessarily, it may work the same way as some 'thermostatic mixer taps' with a constant heat source but motorized mixer valve. Brian.28 replies | 1229 view(s)
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24th November 2019, 10:21betwixt replied to a thread PIC1F1508 with four PWM outputs operating at different frequency? in MicrocontrollersProvided your PWM frequency isn't too high you can generate your own PWM waveform in software like this: 1. use one of the hardware timers to...4 replies | 294 view(s)
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23rd November 2019, 21:08betwixt replied to a thread PIC1F1508 with four PWM outputs operating at different frequency? in MicrocontrollersSee data sheet section 23.1.1 Brian4 replies | 294 view(s)
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23rd November 2019, 09:29... also note that the wiring to pin 4 is wrong! Brian.6 replies | 441 view(s)
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22nd November 2019, 09:57betwixt replied to a thread Datasheet or Replacement for IC 2003 - BA234980509H in Service Manuals, Requests, Repair TipsThere is a multitude of different, incompatible but similar functioning ICs for that purpose so I wouldn't risk experimenting with other types to see...6 replies | 557 view(s)
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21st November 2019, 22:48betwixt replied to a thread Datasheet or Replacement for IC 2003 - BA234980509H in Service Manuals, Requests, Repair TipsDevices starting with 'BA' are usually manufactured by Rohm. 0509 could be a date code - week 05 of 2009. Can you post a photograph of the IC so...6 replies | 557 view(s)
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21st November 2019, 09:48You can't combine the AC sources because of different voltages and phases but for a "simple universal SMPS" with low power capability like that I...2 replies | 261 view(s)
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20th November 2019, 23:49betwixt replied to a thread What wire is this? Old 2009 TV in Service Manuals, Requests, Repair TipsFigure of 8 twin cable fitted with 4mm plugs. You can use twin power cord wire to replace the cable and the plugs are cheap and easy to find. ...3 replies | 317 view(s)
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19th November 2019, 09:46betwixt replied to a thread public hex to asm possible to get in Software Problems, Hints and ReviewsPatching a HEX file is not something we would normally do so don't worry about learning it too much. Having said that, I think most of us 'more...54 replies | 3209 view(s)
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