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  1. Yesterday
  2. Here is another forum topic discussing this power supply. (in Russian) http://forum.cxem.net/index.php?/topic/209045-бп-на-tl081_0-30v-0002-3а-и-его-модификации/
  3. Last week
  4. If you look around on ebay or amazon.com for "audio amplifier board 5 volts" you may find something that would be helpful. Like: Icstation PM2038 2X5W stero audio amplifier board 5v USB powered adjustable volume. They are quite inexpensive. https://www.amazon.com/PM2038-2X5W-Stereo-Audio-Amplifier/dp/B01NABJTDJ/ref=sr_1_36?crid=2KDQ8EUT857T7&keywords=audio+amplifier+board+5v&qid=1558736268&s=gateway&sprefix=audio+amplifier+board%2Caps%2C184&sr=8-36 Sorry I can not be more helpful.
  5. Most of the spec's for the headphones are absolutely useless. The frequency response spec's do not say plus and minus 30dB which is horrible or plus and minus 2dB which is pretty good. Who cares about the length of the cord and the weight? The important spec for the ear speakers is the impedance that you can measure with a multimeter but you didn't. If the circuit is modern then it uses tiny little parts that are difficult to solder and unsolder.
  6. I can answer the 2nd question for you, as I have 2 3d printers, both having heated beds. The heated beds are required when printing with some kinds of filament, such as ABS plastics. If the bed is not heated to a certain temp n kept at that temp the print adhision may fail totally or even warp your print(s). So the beds will be needed in some cercomstances. Hope this helps. I think as for the voltage, I think most are 12v DC, atleast mine are. Joe
  7. Ok, first I have a set of turtle beach ear force x11 gaming headset with the following specs: Headphones: - 40mm diameter speakers with neodymium magnet - Speaker Frequency Response: 30Hz - 20kHz, >120dB SPL @ 1kHz - Condenser Microphone Frequency Response: 50Hz - 15kHz - Cable length: 16 ft. (4.877m) - Weight: 6.4 oz. (233g) In-Line Amplifier: - Headphone Amplifier: Stereo DC-coupled, 35mW/ch, THD <1%, Frequency Response: DC - 30kHz - Mic mute switch - XBOX controller 2.5mm input jack - Maximum analog input level with volume control on maximum setting: 2Vpp (700mV rms) - 3.5mm plug for mic output - 3.5mm plug for line input - Weight: 1.3 Oz (36g) - USB connector for power (5VDC @ <50mA max) - Dimensions: Height .5in (1.27cm), Width 2in (5.08cm), Depth .75in (1.905cm) My idiot brother got ahold of my headset and not only ripped the wires loose from the controls output wires, but apperently also fried the controller... my question is, can anyone recommend circuitry to fix the mic and speakers?? Don't care about the controller port as I don't game online with xbox anyhow, so I only need the mic and speakers. I looked on project page, but since my knowlage of audio like this is non exhisting. any help is appreciated. Lucky for me the input side of wires is good, so I got a usb for power, mic plug and speaker plug. Meanwhile, going to try and see if I can locate scematics for the contoller. I know I can just buy new set, but I don't have much cash lately, so fixing them better option for me. Thanks. Joe
  8. Earlier
  9. audioguru

    LED panel .

    Can you provide a link to the ebay ad? Your schematic shows strings of 3 LEDs in series and a tiny resistor is also in series. Your pink and blue lines show that all the strings are in parallel. Since a white LED is about 3.2V to 3.6V then the entire bunch of LEDs uses a 12V supply.
  10. i also have the same problem :/
  11. SeeedStudio is supporting the maker with this great offer! They will assemble your PCB (5 pieces) for free. You just need to purchase the parts and place the order online. More information: https://www.seeedstudio.com/free-assembly-for-5-pcbs.html
  12. Ls mecapion apm-sc06ddn-kx Used in cnc machines - I think so
  13. You really have given too little info, I'd suggest a few search strings on google, or to update your question. Heres a resource that might get you on the right path ~ https://electronics.stackexchange.com/questions/148023/how-to-change-the-frequency-of-ac-supply
  14. Thanks for attaching the Gerber. Could you give us more information on the rating (votlage/current) of the heating element as well as why this is needed on 3D printers?
  15. I looked around for such a charger, but seems difficult to find a suitable circuit for such high current output. Let see if someone can come up with a schematic.
  16. Design files :3D printer’s Magnetic heat bed MK52-20180126 3D printer’s Magnetic heat bed MK52-20180126.rar
  17. take a look at these 3 phase motor controllers, http://www.electronics-lab.com/project/3-phase-ac-motor-controller/ http://www.electronics-lab.com/project/inteligent-power-module-ipm-board-brushless-motors/ What kind of motor is yours?
  18. Hello I am thinking of using an IR2130 chip to drive powerful transistors. The control will be with pulse generator and 74HC175
  19. Could you provide the design files or Gerber files, otherwise this is not usefull for the members of the community.
  20. Here is the project page: http://www.electronics-lab.com/project/power-supply-brushless-motor-drivers/ This board produces 400V output to power Brushless Servo Drivers, mainly IPM Modules. It is not able to drive the motor. For this purpose you will need a driver board. We can produce this board if order quantity is > 25 pieces. If this interests you, i can quote for that. An Arduino can be used to produce the control signals for the control board.
  21. This is the basic connection of BMS charger circuit. Do you need the scheme for the charger it self maybe?
  22. I would like to build a 6V 20amp charger for my 6v 200ah Battery so I can balance charge them before connecting to a converted UPS to use as an Inverter. I would like a smart charger that can regulate the current supply as the battery charges up. I hope to get a schematic I can put together to achieve this. Thanks.
  23. Anybody can help me to get hex file from tms320f2812 processor by jtag or any way
  24. Hi, This is my very first post on this great forum. I do not have any background in electronics. I want to know if it'll be possible for me to build my own Faraday cage, what tools and equipment would I need? On the net, people are saying, one would need wood, aluminum mesh or copper mesh. Which of these two is better? Is there a way to verify that the aluminum mesh I receive is really aluminum and not something which is passed off as aluminum. Will it block almost all EMF? Is it possible for a normal person to build their counter surveillance equipment of the sort shown below? 1. 12 Antenna all frequency jammer: https://www.youtube.com/watch?v=gMOpxrs53YQ 2. Hidden spy camera viewer: https://www.naconwireless.com/our-products/anti-spy-equipments/?SingleProduct=22 Thanks
  25. BMS 18650 chargers are quite inexpensive off Ebay if you are not big on rolling your own. https://www.ebay.com/itm/3S-20A-12-6V-Li-ion-Lithium-18650-Battery-Cell-Circuit-BMS-Protection-PCB-Board/122183528602?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D56826%26meid%3D93e40678e3dd4abe9ac93405e5253fca%26pid%3D100005%26rk%3D5%26rkt%3D12%26sd%3D253289010740%26itm%3D122183528602&_trksid=p2047675.c100005.m1851
  26. 3D printer’s heat bed fabrication 3.0mm FR4 and Aluminum base with sink hole , open slot processing 3D printer’s Magnetic heat bed jun@tendtronic.comTendtronic printed circuit board
  27. You have 12V, not plus 12V and minus 12V which is 24V. What you label as -12V is actually 0V. An ordinary older type of Lithium Ion cell is 4.20V when fully charged so your charger should have an output up to 12.6V, not 12.0V. The charger circuit should have wires connected between the series batteries so that it makes it a balanced charger.
  28. Need info for scheme bms 12v I -[===]+ -[===]+ -[===]+ l I -[===]+ -[===]+ -[===]+ l I -[===]+ -[===]+ -[===]+ l I. I I. I I. I 12v - 12v +
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