I am trying to install a additional parts to my car. when i remove the bare PCB with lcd from the head unit. i accidentally grounded the circuit board to the Metal plate, it create a little spark. now the LCD doesn’t work.

my question are
1. is the circuit board fried?
2. could it be just a blown fuse?
3. after ground the board, could it be just burn resistor?

is there any way i can buy a new circuit board and how do i do it

I installed a software that let me use the PC as an oscilloscope , but
it does not mention how to connect the circuits to be tested with the computer an through which port.Does anyone lead me?
I mean how can I connect that cable to
the circuit ?

I am looking to build a go kart type thing. or powered parachute. Can anyone tell me a way that I would be able to make the motor/engine slower or faster depending on how hard i press the pedal? Should I do this with an electronic circuit board type thing? or is there a simpler way?

Here’s the problem. I just want to know how to approach it…PLEASEEEE…You dont have to solve it all. I just need to know the basics. I am in desperate NEED!!!

Charles Watts Electronics manufactures the following six peripheral devices used in computers especially
designed for jet fighter planes: internal modems, external modems, graphics circuit boards, floppy disk drives,
hard disk drives, and memory expansion boards. Each of these technical products requires time, in minutes, on
three types of electronic testing equipment as shown in the following table:

INTERNAL/ EXTERNAL/ CIRCUIT/ FLOPPY/ HARD /MEMORY
Test device 1 7 3 12 6 18 17
Test device 2 2 5 3 2 15 17
Test device 3 5 1 3 2 9 2

The first two test devices are available 120 hours per week. The third (device 3) requires more preventive maintenance
and may be used only 100 hours each week. The market for all six computer components is vast, and
Watts Electronics believes that it can sell as many units of each product as it can manufacture. The table that
follows summarizes the revenues and material costs for each product:

DEVICE/ REVENUE/ COST
Internal modem 200 35
External modem 120 25
Graphics circuit board 180 40
Floppy disk drive 130 45
Hard disk drive 430 170
Memory expansion board 260 60

In addition, variable labor costs are per hour for test device 1, per hour for test device 2, and per
hour for test device 3. Watts Electronics wants to maximize its profits.

a) Formulate this problem as an LP model.
b) Solve the problem by computer. What is the best product mix?
c) What is the value of an additional minute of time per week on test device 1? Test device 2? Test device 3?
Should Watts Electronics add more test device time? If so, on which equipment?

It’s a circuit board from an RC plane. The two chips have 3 pins each and they seem to bridge the negative battery pole to the negative terminal of the DC motor. The print on the chips say 85T03GH and 608124.
See them here… http://www.salsadynasty.com/chips.jpg

Im newbie with electronic components but is there like a timer component for an electric circuit which like you can control how long current is allowed to flow?

A tutorial link would be helpful.

I’m doing a project, and I need a circuit board that converts our 0 to 8 volt AC Current to a 5 V DC Current. Also if you know how could we connect the output to a USB Port. Were trying to convert this AC current to a DC current to charge a device through a USB Port. Thanks!

All of IC were soldered directly on PCB, there is no way for me to remove each one just to find out which one is shorted.