HackoBoy

Hello. Where can I buy a shielded audio cable? The problem is that two Oberton B1200 amplifiers - at minimum amplification have Brum in the outputs + very quiet music. When I gave up after all the measurements - I slightly moved part of the cables to a different position (now to the toroid, then to the radiator of the final amplifier) the noise started to mix in the left or right or both channels. I test this with plugged in headphones at the output instead of running to the speakers every time I did not expect that with serial production and many years of work - they did not understand it. They used a ribbon cable to the different boards. 1: Preamplifier to the front panel with the potentiometers. Ribbon 5 core cable for each channel 3 wires in a braid 2: Pre-amplifier to Power amplifier board: ribbon cable with 4 cores (the two are +15 V, -15 V stabilized by zeners from the Power amplifier board with which the preamplifier is powered) the other two are (the signal to the Power amplifier board ) here I will use 2 cores in a braid separated by the choke Am I headed right?

I got nervous initially, one channel of the speakers hummed very weakly and was almost inaudible, but directly through headphones at the output, a hum is heard the problem turned out to be in the amplifier. I found where the input signal of the amplifier is. Even if I short the input of the amplifier it still hums.

I tried the following today. It is difficult to test the speakers and I collected test cables (audio headphones connected in series through a small capacitor and resistor) and I was able to hear that the sound from the preamplifier was clear. And when I adjust the output level of the preamp - there is no noise at minimum, and no sound at all. But when I connect headphones to the output and have reduced the amplifier to a minimum - a slight music + buzzing is heard, which intensifies when I bring my finger to an element of the feedback of the TL082 (through which the amplification is controlled)

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 comes from a component mounted in the feedback of the input TL082 (opto-resistor) and the closer my finger is to the housing of this element - the hum intensifies, if I touch it even louder it hums. It serves if the input level is too high - to limit the signal (indicated by an LED) How to remove this buzzing (if there is no applied voltage to the optocoupler - the output shows infinity, if there is an applied voltage - the output shows 300k ohms) The other phenomenon when there is an audio source connected - and the potentiometers are at a minimum - the outputs of the amplifiers play weak music.

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.

I found the problem quite by accident When the problem came, I measured the voltage of the lm7812 - input and output = 0 volts. I started measuring with a multimeter and pushed the electrolytic capacitors and other elements - and when I pushed the fuse housing that is mounted on the circuit board - the test started. It turned out to be a bad solder, and during the vibrations from the low-frequency speakers - it breaks. I will resolder the fuse contacts tomorrow.

blocked. Sometimes everything works, but sometimes it crashes. Is it possible that the power supply unit has problems and interferes with the control.

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 indication works as well as the relays. After it freezes - nothing works and the only option is to turn it off and on. Sometimes when turning on USB memory, or as the selected player plays.

no. In this file ( who i downloaded before days ) i do not see how this 8 x 6 V Batteryes will be conected with cable and 9 pin connector . . In my case i have 9 wire on this connector . 3 from them - connected to Positive end from Battery pack 3 from them - connected to Minus from Battery pack. This wire connected to power inverter MOS Transistors 1 wire - connected to chassis of UPS Have 2 wire - who connected to pcb up to transistors , resistors , diodes , CPU ) It is possible with these two wires to feed the electronics that command the mos transistors and do not know what voltage it should be. That's why I was hoping for this scheme - to see at certain points what I should have

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 cables that go to the electronics that drives the power part.

After I did not see the board name (usually write the PCB model), I removed the front panel. But obviously this is a super new version of a PCB and there is no information. If the connector ( sck sda rst vcc gnd ) ... I now see that some of the captions are used in the oled displays. And it's actually programmed or connected to a display instead of a 7-segment indicator ?

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 microcontroller for almost 2 euros. What will be needed to try reading the code and having it as a file this device is powered directly to the electrical outlet to the white connector, and when I set the temperature, I see the heater flashing differently according to the temperature and the power of the air jet. When placed, the stand stops heating and only blows while it is needed or if it reaches 100 degrees and shuts down Chips using in this device : Upper left -> Eastsoft HR7P169BFGTF Upper right -> F7103 in the middle on pcb -> LM358 in the below the transformer -> PN8370 Using moc3023 who the control bta12/800A

Ls mecapion apm-sc06ddn-kx Used in cnc machines - I think so

Hello I am thinking of using an IR2130 chip to drive powerful transistors. The control will be with pulse generator and 74HC175

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