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    Problem with my power amplifier Oberton B1200

    Hello I have two amplifiers, one of which had a problem with the output relay and I changed it. But I noticed that one channel hums weakly, and the other more loudly. After swapping the terminals to the preamp, the hum moved to the other channel. When I tested with an audio signal, the hum...
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    shaded pole motor rewinding

    Hello .  Have a new problem with my motor who have 2 speed ( use in dehumidifier ) Why is there no information on the Internet how to calculate the thickness of a wire and the number of turns and power.
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    relay control problem

    Hello There is no one to help in my town. I have a demo stand for car players and speakers. After it turns on and works after hours or minutes - it blocks. There are several boards mounted in the rear end and with the help of non-retentive buttons I select a player and a speaker. The...
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    UPS MGE PULSAR ESV 22+

    Hello I have this UPS - without battery pack and external cabble with 9 pin molex mlx. I need the circuit to know how to connect the batteries. Because with this connector I have cables from the battery (I suppose is for 48 volts) I have the power cables to the transistor switches but I have 2...
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    Help for read MCU HR7P169 ( from my Hot air soldering station )

    Hello guys I have one request. I bought a hot air station .This device - at a low price - where the main role for the job is using a microcontroller  HR7P169 There is a connector option on the PCB and I suppose it is for reading and overwriting. After the station for me was 30 euros and the...
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    Speed controller for AC Servo Motor - help

    Ls mecapion apm-sc06ddn-kx  3 phase , 200 V , 3.82 A , 550 W , 200 Hz max , 2000 rpm Hello . I have this electric motor, but I have no control. Can you help me with a scheme to manage it
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    Automatic turn on/off power supply transformer - primary winding

    Hello I have an idea, but I do not know how. I noticed that the charger for my phone if the phone is not turned on to charge - it does not consume anything. But when I turn on the micro usb connector - then begins to consume. Now fit a box that will convert unbalanced audio signal into...
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    Help for Desulfator charger lead acid battery

    Hello, everyone I need your help to assemble charger for lead-acid battery charger . I have a ( 6 volt 12ah )battery which was forgotten and for many months and he had died . Added  distilled water and got her back to life with the ordinary  charger. But inside  I see white crystals and need...
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    Soldering station project

    hello First, I apologize that my English is not very good and at times I use google translator :) But most of them understand words I decided to buy a soldering station, but those who themselves control the temperature sensor and heater use - were quite expensive in my city. After reading...
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    4 channel color light organ

    hello I decided to assemble a simple scheme color organ  - only miss one audio compressor  into  circuit diagram  :) Can you help me with a diagram - signal i will take it from the output of the sound card on my computer. http://radio-stv.ru/?page_id=1942 lamp H1 = up to 100 Hz H3 = from 100...
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