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  1. Today
  2. I got this circuit online and I'm not very surprised that it does not work. I am not smart enough to fix it. LEDs appear to be ON all the time but maybe they are blinking so fast they appear to be ON all the time?LEDs are a bargin pack 100 for $3 about 5 years ago, they don't lite up very bright, won't be easy to see after dark on fake security system.Circuit calls for 10uf capacitors, I changed caps to 100uf LEDs still appear to be on all the time. 1 blink every 2 seconds from each light is what I want?I tried 3v, 4.5v, 6v. new batteries.
  3. Hi, I have an intercommunicator, that have an speaker/mic. I want to connect it in parallel and using an comutator, to a mic and speaker. For impedance fix I'm using an op-amp(lm324) in buffer configuration. I get notorious distortion, so I'm using a 6.8kohm connected to ground and out, that is ok?. The mic have 500ohm rate impedance output. The connections in the figure are ok?, how can improve? Thanks. Regards.
  4. My team has decided to make a prototype of an "Advanced" SPD by incorporating an electronic circuit which shows notifications and an additional circuit which shows earth faults if any in a circuit. As we were planning to use MOVs with Thermal cut-off, the notification incorporation is not a big deal. But the problem is that, there is only 20kA Imax for the proposed model of EPCOS and we require models with more than 40kA which is not available in the MOVs with Thermal cut-off so we have decided to use normal MOVs of that capacity for which there is no notification/monitor lead. Please propose any alternative or a better idea to put this things together. Also we are trying to use GD tube/Spark Gaps in the higher models along with MOVs for which the notification is again a concern. valuable suggestions please!!!
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  10. peter g

    advanced l/c meter

    yes, the meter that is really good is called LCM3. google it, I really like it, as it reads both capacitance and esr at the same time in circuit ,most of the time.
  11. Yesterday
  12. Hello dear, Nice information about PCB Manufacturing. PCB assembly comprises several electronic components that enable the functioning of an electronic device. PCB assembly services consist of multi-stage processes that include placing components on a PCB board, soldering them in place, and inspecting and testing these components. PCB assembly is often outsourced by OEMs to a specialist firm, as setting up a printed circuit board assembly unit requires a significant investment. There are hundreds of tiny components that help complete the circuit in a printed circuit board. A few months ago one of my friends takes the service from GREATPCB SMT LIMITED, which specializes in and guarantees prompt delivery of fast-turnaround PCB and PCB assemblies. Thanks & Regards, Yuaan Liie
  13. Last week
  14. Hi all. I need to build a relay driver circuit which i can control using my 8051 microcontroller. In my existing circuit i am using NPN Transistor to drive the relay. but the problem here is when i turn the relay ON and OFF continuously with a delay of approx 2 seconds, sometimes the system gets hanged. i have even added a diode to relay coil, but then too i am facing the problem. I am driving 220V AC load using relays. My only source to power the microcontroller and relay is 5V SMPS. i am powering the microcontroller and SMPS using the same 5V SMPS. is this the problem, if so, can i add two diodes at output of SMPS and differenciate the 5V for both microcontroller and relay.
  15. admin

    advanced l/c meter

    Can you point us to the most interesting ESR meter you've build?
  16. HarryA

    Phone components

    audioguru is correct. But if you are interested in cell phones you may find this site helpful: https://www.instructables.com/id/Make-your-own-cellphone-from-scratch/
  17. yuehuazz

    Vibration Sensor Selection

    I hope I can help you, there are sensors of great quality.
  18. peter g

    advanced l/c meter

    yes, the meter worked fine. I have built many esr meters, both analog and digital.
  19. Earlier
  20. audioguru

    Phone components

    There are a few completely different types of phones and you do not say which one. Landline phone, wireless phone and cell phone. Take one apart and look inside then count the components. Why???
  21. Vlad Krasavtsev

    Phone components

    Are many components required for a phone?
  22. admin

    advanced l/c meter

    Hi Peter and welcome to the community. Could you share your thoughts building this LC meter and if everything worked right from the beginning.
  23. peter g

    heathkit IT-11 capacitor checker

    hello forum members, I have the above cap checker that's having a problem. i'am trying to set the leakage currents for the three different type capacitors. the Electrolytic position can be set to 2ma. the min electrolytic and non-electro, needs to be set to 15ua and 2ua respectively. the eye tube will not close in any position of the adj pots. I changed the two main electrolytics and the 6BN8 tube to no avail. need help please.
  24. I want to be a power electronics engineer, but I am anxious that I don't have the minimum skills in order to become one. From past posts about power electronics, I know that skills in analog ic design and VHDL or Verilog are needed. I wanted to know what other skills are necessary to become a power electronics engineer? My background: I have a BS in electrical engineering (power and energy systems concentration) and am a first year masters student. I have taken at least one course in power electronics, microelectronics, and control systems. I have yet to take an analog ic course, and I dropped a digital ic course after two months as I didn't enjoy working with W/L ratios or physical layouts. My programming skills are limited. I learned C and Python, but I haven't used it outside the class. I am comfortable with MATLAB.
  25. I think membrane switch... Membrane switches are the modern version of mechanical types and are meant to deliver exceptional performance when put inside dominant devices. These are just short switches that are widely employed in many electronic appliances today. These switches are now highly preferred over the traditional ones as they come with customizable options. They are incorporated with print copper or silver because of the main circuit layer. They can be non-tactile or may have a tactile response which then makes the device fast and minimizes its operation time. They also provide the very best level of responsibility, execution, and integration, which are required today as we need precise switches to run advanced and sensitive electronic switches.
  26. How stable are the temperature readings?
  27. hesamavr

    proteus 8

    What do you want to do with the Proteus 8? circuit simulation or PCB design?
  28. hesamavr

    Did I design this right?

    Hi, I don't work with the KiCad, so I checked the images. Try to use a solid polygon for a ground plan instead of routing ground tracks for all components. This is the first tip before anything else
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