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  1. Yesterday
  2. In the world of electronics what is a "landing deck"? I only know of landing decks on aircraft carriers and at the foot of stairs. I am guessing it is where you "land" your cell phone. I don't have a cell phone as we do have service where we live.
  3. Hi guys, I need help to build my electronics project and I was thinking to build a landing deck with breadboard and led. Is there anyone can help me about it? I don’t have any idea where I can start.
  4. They are mostly registering as a plain user, they pass the question, automatic Spam Defense which flags the accounts with spam score and they also approve their email address which is new each time.
  5. Last week
  6. Can the bad guys login via "Sign in with Twitter or Linkedin" or Anonymously thus avoiding the question?
  7. We told you on all the other websites: Since you cannot read the simple schematic and do not know what connects to what then you probably have parts with the wrong values and ratings. Don't make this dangerous project.
  8. To start with those capacitors are 4700 microfarads (not 4.7) at 400 volts, not cheap. The resistors are 50 watt resistors. I would think the yellow leads on your transformers are taps, here unused. If you connect two of the output black wires together and measure the voltage across the other two you should get 220 volts rms. If not select a different wire for one of then. You must have at least a inexpensive multi-meter to work with. Beware these are high voltages and those large capacitors hold enough current to do you in!
  9. I am recreating the induction launcher in this YouTube vid: I have all of the parts:2 tranformers4 resistorsbridge rectifier4 capacitorsSCRSwitchElectromagnet coilI don't know how to read the schematics - HOW do I connect all of the parts and where for each? Get back to me so we can talk about it. Thanks
  10. Earlier
  11. How to solve the ADS1230 temperature? Is it related to offset calibration?The 16 bits are taken as the two bits change with temperature. Is it related to offset calibration? Calibrated before AD starts? Or calibrated after AD startup? I used the original scale hardware to include the 1230 and the sensor and power 3.3V circuit. The original connected MCU is disconnected, and only three control lines and ground lines are connected. When the temperature rises, the number of readings increases. It is basically unchanged in a short time (about 1-2 hours) at normal temperature. Is this situation a warm performance? How to solve? The original scale has been very stable.
  12. I have now added: "How many color bands a typical resistor has?", let's see how it goes and if this guessed easily i will replace it.
  13. Something like what is the: "unit of capacitance"a five letter word". It is only a slight inconvenience at most for real people plus they only have to do it once. I set up a forum earlier this year and asked the local padding group if they wanted to use it but they decline. I did not do anything with it for a few months until I got an error message via an email. When I looked at it I had 6800 members, 90% were Russian. As I could only delete 30 members at a time it took awhile to get rid of them.
  14. Yes it seems so, any idea for an electronics related question?
  15. I think your registering question is weak. I would ask a question that requires a Yahoo search. Perhaps the spam computers could not do that. Like what is Pi to the 6th decimal place?
  16. This feature is enabled on our community but seems spammers get new way to register and post. We keep a close eye on the situation.
  17. Why don't you all use the spam prevention tools? https://invisioncommunity.com/features/spam/ On my forum one must answer a question that any kayak or canoe paddler would know to register. Got read of the damn Russians!
  18. If you need a lot, I think I can help you. I am in China and the shipping costs are very expensive.
  19. Abstract: A high-quality switching power supply efficiency is as high as 95%, and the switching power supply loss is mostly from switching devices (MOSFETs and diodes), so the correct measurement of switching device losses is critical for efficiency analysis. So how do we accurately measure switching losses? First, switching loss Since the switch is a non-ideal device, its working process can be divided into four states, as shown in Figure 1. "On state" means that the switch tube is in the on state; "off state" means that the switch tube is in the off state; "on process" means that the switch tube is switched from off to on state; "off process" means that the switch tube is from conduction The conversion is turned off. In general, the main energy loss is reflected in the "on process" and "off process", a small part of the energy is reflected in the "on state", and the "off state" loss is very small, almost zero, negligible. Figure 1 Switching tube four state division The actual measurement waveform is generally as shown below: Figure 2 Switch tube actual power loss test Second, the conduction process loss The energy consumed by the transistor switching circuit during the conversion process is usually very large, because the parasitic signal of the circuit prevents the device from switching immediately, and the voltage and current in this state are in an alternating state, so it is difficult to directly calculate the power consumption. The voltage and current are considered to be linear, so the loss can be roughly calculated by finding the area of the triangle, but this is not accurate enough. For digital oscilloscopes, advanced math functions are provided, so the loss of the conduction process can be calculated using the following formula. Eon represents the loss energy of the conduction process Pon represents the average power loss (active power) during the conduction process Vds and Id represent instantaneous voltage and current, respectively Ts indicates the switching period T0, t1 indicate the start time and end time of the conduction process Shutdown process loss The closing process loss is the same as the conduction process loss calculation method, except that the start and end times of the integration are different. Eoff represents the loss energy of the shutdown process Poff represents the average power loss (active power) of the shutdown process Vds and Id represent instantaneous voltage and current, respectively Ts indicates the switching period T2, t3 indicate the start time and end time of the shutdown process Third, conduction loss In the on state, the switch tube usually flows a large current, but the on-resistance of the switch tube is very small, usually in milliohms, so the energy loss in the on state is relatively small, but it cannot ignore. Using an oscilloscope to measure conduction loss is not recommended for voltage-to-current integration because the oscilloscope cannot accurately measure small voltages during turn-on. For example, when the switch is normally turned off, the voltage is 500V, and when it is turned on, it is 100mV. Suppose the accuracy of the oscilloscope is ±1‰ (this is a very bullish indicator), and the minimum measurement accuracy is ±500mV. It is impossible to accurately measure 100mV. It is even possible that the measured voltage is negative (100mV-500mV). Since the small voltage at the time of conduction cannot be accurately measured, the energy loss error calculated by the method of integrating the voltage by the current is large. On the contrary, the current is large when turned on, so it can be measured accurately, so the current and on-resistance can be used to calculate the loss, as shown in the following formula: Econd represents the loss energy of the conduction state Pcond indicates the average power loss (active power) in the on state Id represents the instantaneous current Rds(on) indicates the on-resistance of the switch, which is given in the switch, as shown in Figure 3. Ts indicates the switching period T1, t2 indicate the start time and end time of the on state Figure 3 shows the relationship between on-resistance and current Fourth, switching loss Switching loss refers to the total energy loss, which consists of conduction process loss, shutdown process loss, and conduction loss, calculated using the following formula: Five, switching loss analysis plug-in High-end oscilloscopes usually also integrate switch loss analysis plug-ins. Because the on-state voltage measurement is not accurate, the calculation formula for the on-state can be modified. There are three main types: ● UI, U and I are measured values ● I2R, I is the measured value, R is the on-resistance, and the user inputs Rds(on) ● UceI, I is the measured value, and Uce is the voltage value input by the user to compensate for the problem of voltage and voltage uncertainty. It is generally recommended to use the I2R formula. The figure below shows the switching loss test diagram of the ZDS4000 Plus. Figure 4 Switching loss test results Summary Switching loss testing is critical for device evaluation. With a professional power analysis plug-in, the power loss of the device can be evaluated quickly and efficiently, which is simpler and more convenient than manual analysis. For MOSFETs, the I2R conduction loss calculation formula is the best choice.
  20. I just copied the whole section, didn't feel like editing. Speakers are those really small cheap over ear headphone/small toy looking speakers, I think they might be bad...they measure 30 ohms. I didn't think they had that much resistance on them. Probly simpler to just buy a new headset n say heck with it.. Joe
  21. Crosley still make record players. I found one in the trash that was probably wrecked by someone using the wrong polarity 9VDC adapter. it has a full range mono 6" speaker in it. it has an Aux output to feed an external amplifier if you want. A car amplifier runs from 12VDC. http://www.crosleyradio.com/turntables
  22. First post, hope this is appropriate for forum: I am wanting to build a friend a cabinet which will house a record player which will go to one speaker. This is going to be in a cabin and I don't want a stereo sound. I want it to sound "old." Anyway he uses a generator for electricity and eventually he is going to be putting batteries up there which the generator will charge. But for my project I was thinking of having 1 or 2 motorcycle batteries or possibly one bigger car battery housed in the cabinet which will run the record player. In addition to running the record player it will need to power the speaker. Lastly, depending on the speaker I get and the record player I may need an amplifier, so all together there could be 3 sources drawing electricity. So my question is, how can I calculate the total draw on the battery and then calculate how long will this play the record player. I assumed I would need a converter that took the 12 volts and converted to 120, but if there is a better answer I am all ears. I am happy to study and do the research, but would appreciate being pointed in the right direction. Thank you.
  23. I got myself a usb scope. I found that the egs002 wasn’t giving the correct wave. On outputs 1 and 2. And output 3 was a constant 6v. Not a wave at all. Got another egs002 (before getting the scope). And that had one dead output. Attatched is a schematic for the egs002. And the h bridge. Which although not for my inverter, is identical
  24. Share several electronic component platforms: 1. http://www.hotenda.com 2. http://www.winsupport-ic.com 3. https://www.omo-ic.com 4. http://www.endezohk.com 5. https://www.barumelec.com
  25. Without a circuit diagram it is very difficult to help you. You can find numerous videos on youtube.com related to "EGS002 " that maybe helpful. Good luck. Looks like I was born under the sign -V (I talk to much?)
  26. I have purchased this Tssop/Msop adapter to copy or programming some devices, and this works fine. http://www.winwinmascot.com/sale-8784423-soic8-tssop8-pogo-pin-adapter-for-eeprom-93cxx-25cxx-24cxx-ar32-vvdi-2-tools-programmer.html
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