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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Help, my power went out and came back at 70v, I think it hurt my iSpring UV ballast for 11W lamp. The electronics look good but it just doesn’t light up or for that matter the ballast ON LED doesn’t even come on.
How would you go about testing some points to see where the fault might lie?
I...
Noobie Question!
I just got a UV lamp I need for Uv glue curing but the plug is European, I live in Mexico and I dont know if I have to return the lamp or an adaptor will do the trick
I’ll put the link where I bought the product, some specifications and photos.
I dont know enough electronics...
Why does adding a capacitor in series to an AC motor increase its speed? The capacitor does boost the voltage somehow because the input voltage is 132v (mexican mains) and coming out from the capacitor are 230v. This has to do with the inductance because it wont work without the motor. I made...
Hello!
I need to build a circuit with a DC output that is ON whenever the AC input is active (a.i. voltage is present at the input) ideally from as low as possible but it could be as high as 200, 250 VAC and still be acceptable but needs to survive up to 1000VAC spike and some 600VAC constant...
Hi People,
I am using an LM 319 High Speed Comparator to produce high frequency square wave as shown. However, from the first diagram, I assembled the connections based on second diagram, it does not work. The V+ and V- that is negative rail and positive rail I used is +9 and -9 V from 2...
Please forgive if some information or diagrams are missing, I will provide any information you consider necessary if you ask for it in the thread. As you might soon discover I have no background/knowledge in electrical engineering.
I will start working on a project to build an electric rat...
Recently got one of those, and I was wondering what the output voltage was. I know the input is 5V, but the very-much-standart Li-ion 18650 battery I use is 3.7V I'm planning to connect a Digispark ATTINY85 board to the output, which requires also 5V. Will the ATTINY85 work properly? I heard...
Hello I have been trying to build a tesla coil for awhile now. I cannot get a bulb to light up . I have gotton some crazy voltage readings tho. It only a 9 volt coil and this my first big project . getting really frustrated , just need a little help. Please anybody
Hi, guys, I'm new here. Recently I made a design of TPS54116QRTWTQ1 based on the datasheet. According to my design parameters, the actual voltage CPUVCC15 is 1.5V, VTT_DIMM is 0.46V and VTTERF is 0.86V. But the voltages of VTT_DIMM and VTERTF are not correct. When I remove the load behind...
Has someone the new datasheet from the JYQD_7V.3E3 motordriver 24V (that one with the hall sensor pads on the side)? I can't find the new version or this one where the hall sensor pads aren't aligned...
Hello everyone,
I resigned a few months ago and transfer the industry. I have already learned the basics of circuit, 8051 microcontroller, I contact proteus a few days ago, and now I am using it to make PCB. I am currently blocked on the schematic.
I want DIY a learning board, it will include...
Hello Everyone
In this post I want to ask if you know of any circuit that can protect the integrated ULN2803, because when I make the connection to a stepper motor it overheats and stops working correctly, or I advise to use another reference to control the motor Step by Step?
ULN2803
I am...
Hi guys,
I'm in an introductory EE class and I was wondering, if the dependent variable of a dependent current source is zero, does the dependent current source become a short circuit or open circuit?
Thanks for the help.
Hi guys,
I'm working on a problem here where I believe one of the steps uses voltage division to find the voltage across the 10ohm resistor. However, that's not how the solution found the voltage across the 10ohm resistor.
I was trying to find the voltage across the 40ohm resistor first and...
Dear all,
I am trying to build 3 phase voltmeter that could measure L-L and L-N voltage during 3 phase 3 wire and 3 phase 4 wire connection. 3 phase 3 wire and 3 phase 4 wire connection are external connection.
as we know in 3 phase 4 wire we will get neutral reference so we can get...
Hi guys,
I am a total noob and just learned voltage division. I was given this circuit and was wondering why it is appropriate to apply voltage division across the 60 and 20 ohm resistors.
I know they are in series which is the basis for voltage division, however the 45 ohm resistor on the...
Hello everyone,
I have a little issue here. I know it's not really hard but it has been a moment since I've worked with circuits like this and transistors, so I can't figure out this circuit...
The question is: In DC analysis, calculate the bipolar transistor's voltages Vb, Ve, Vc. Deduce the...
I have an old accelerator board used in the PDS slot of an Apple Macintosh SE/30. The board was manufactured around 1994. I want to replace the electrolytic capacitors but I'm not sure how to decode the numbers printed on the caps. Here's a photo:
As you can see the numbers are:
22
6 A...
I am trying to simulate a half-bridge DC/DC converter, and I would like to increase the output voltage to at least 320 V.
Do you have some suggestion on how to do that?
Hello...
I have an DC to AC inverter, which is capable of outputting 600 Watts at margin. I have a few inductive loads that causes the inverter to overload and restart (after restart the load works fine). Although it only takes 1 second approx but still it's annoying...
My inverter can run all...
I am a beginner and wish to tackle this project...
I have an old Yamaha breath controller device that has a 3.5mm Jack and requires -9v on the tip (the sleeve is positive). It draws a current of approx 7mA to 20mA depending on how hard you blow it (from what I have managed to research but may...
have a a Project that measures the voltage from a 3-phase lines and Display it on LCD using PIC16F877A.
I wrote the code in the mikroc language; the problem is that the LCD shows a lot of wrong characters.
this are the Project code `sbit LCD_RS at RB4_bit; sbit LCD_EN at RB5_bit; sbit LCD_D4...
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