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1000 Threads found on edaboard.com: 220 Vac
You have 12v going through 220k ohms (R54). This results in 55 uA which is available to light the led in the optocoupler. It's a miniscule amount. Shouldn't it be more? On the order of 1mA to 5mA?
I understand how to connect the servo motor to the motor drive. I would like to ask how i can connect the motor driveto a 24V DC and then this 24 V DC voltage source to the 220 V socket. I would be very happy about a description or a tutorial with a description how can the connection be made.
Hello: I have a unit with a very thick aluminum box (earth grounded), which is used also as the heatsink. The transistor is a standard TO-220, running at line voltage (115vac). The all-plastic style TO-220 was tried, but simply gets too hot (much worse thermal parameters than standard to-220). The (...)
Hi, We have a contractor who has done away with our feedback optocouplers which were connected up with our main 26V, 50W rail, ....instead he has simply used a low power bias coil on the primary side to do the vout regulation. The topology is an isolated PFC'd Flyback of power level 50W, and vout is 26v, and vac input is 80-135vac. I h
Hello: I have a unit with a very thick aluminum box (earth grounded), which is used also as the heatsink. The transistor is a standard TO-220, running at line voltage (115vac). The all-plastic style TO-220 was tried, but simply gets too hot (much worse thermal parameters than standard to-220). The (...)
The reason the LM317 was designed that way is so that it didn't need a ground connection, and thus could be put in a standard 3-terminal power-transistor package, such as the TO-3 and the TO-220. The disadvantage of this simple configuration, is that the output current through any resistance between the output pin and the top sense resistor connec
Here's the LTspice simulation of a basic circuit using a TL431 reverence as a switch to generate an output from an opto isolator. R_Hyst gives a hysteresis of about 2vac for the value shown. Pot U3 adjusts the trip point. For the setting shown, the output is high for 220vac and low for 210vac. Note that this circuit detects (...)
the current flowing through 0.22 ohm produces a drop which is compared with the Vref you set with R2 pot. Based on the circuit given a rough calculation estimates the current to have a maximum of 220 mA(approx). This will produce a voltage of the order of 50 millivolt(approx) which is set by R2 in max position. the question too low voltag
Hello All...have tried to google also but still cant find solid conclusion. Please help me understand, the original fuse is 220V 5A. Is it ok if I replace with 110V 5A? thanks
I have a follower with TLE2141 that receives at IN + a continuous voltage from AD8307. The power supply is +/- 5V. Without signal at output 6 of TLE 2141 we have 220mV. How do I make 100mV in this case keeping unit amplification? The voltage variation is 220-1330mV with signal and everything is fine. I have tried offset compensation as in the datas
If I use the following Recom DC-DC converter as an example: The /R8 unit is rated as follows: 4000vac for 1 minute 8000VDC 1 second For hypothetical requirements of 1000V CAT II and 600V CAT III the following test requirements apply in IEC61010; Table K.2 5 seconds - 5400
To measure vac Voltages. In that there are three points. 1.Phase with 230vac 2.Neutral 3.Supply 2(vac).Vary from 0vac to 5 vac. The Neutral wire is connected to GND of MCU?s(PIC16F877A) power supply for reference.Phase wire connected to AN0 by resistor network and by adding diode and Supply 2 connected (...)
Help solve the problem. I have a relay that should switch at 220V (COM from NC to NO), and at 110V remain unchanged (COM remain on NC).
Hello All, I imagine it is covered in the UL standards & IEC60950 but before I dig through that is there a well known value, maximum for vac rating of the above pre-preg... ?
Hi, Can you see any gremlins in our mains voltage data logger circuit? Its just to take the maximum peak mains voltage occurring every second. The data logger gets connected to a USB cable then into a PC...(but the PC doesnt have to be connected for the logging to occur..the PC just collects the logs after the analysis period)...and even thoug
I lost the atmega (PORTD.0 is burnt and always low), . led on PD0 is connected to 500 ohm and PORTD.0 is gone. but the othe port PD1 isn't affected its led is connected to 220 ohm. what is wrong with this connection
I remember watching an episode of Watchdog on TV where they were doing teardowns of fake phone chargers and remember one part where the "safety expert" was pointing out that the thickness of an insulated wire wasn't sufficient to pass s
Hi, There is no formal regulation on the mains, so how does it manage to be so well regulated? In Germany (Bavaria) over a long weekend, the mains was pretty much totally between 226-232vac at a domestic readings taken every minute) All readings were within 220-235vac. You would think there would be serious i
Here is an AM solid state transmitter and I would like to use the TDA7360 to modulate the transformer. The transformer is the 12v side of a 220 to 12v mains transformer. Which of the two configurations of the TDA7360 should I use the left or the right one?
I am simulating a transformer using substrate integrated waveguide. The results are confirmed with an analytical solution using equations and plotted in Matlab. To get the correct results using HFSS I should use "Zwave" for the characteristic impedance (Zo) in the wave port excitation after renormalizing the full port impedance to the desired one.