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Industry standard is 10 megaohm input impedance for test equipment - this is to prevent damage to sensitive circuits in the automobile (a lot airbags have been triggered by people using analog meters and old test lights with incandescent light bulbs). You can find reasonably cheap multi-meters...
You should check out some high power car audio amplifiers, they have a few different ways of getting a big power wire into the PCB. Google something like car audio power amplifier terminals - do you have to put terminals on the wires? Many of the larger power amplifiers don't use terminals on...
What one would you start with to learn programming? I have been taking a C course online, did a bunch of starter exercises on proteus with some pic examples off their website(using xc8). I am ready to order some hardware to play with and am trying to figure the best way to go.
you need to compare horsepower not rpm - different cars and trucks use different combinations of high rpm, high compression, turbos etc to achieve as much horsepower as possible. One horsepower is equal to about 750 watts so you can look at it like an audio amp - you compare power in watts not...
Re: How to detect high frequency sound ?
https://www.directeddealers.com/manuals/ig/accessories/N506T.pdf
They use high freq glass break sensors in auto security systems - directed electronics 506t was probably the most popular - it gives a ground out put when the microphone triggers an event...
I just googled the model # - that is a pretty old unit - I remember installing many of them in the early 2000's. Its not worth fixing for what new head units cost today ( and perform much better).
There are only three wires you need for the stereo to power on, constant power (always on), accessory power (turns on and off with the key) and ground. Test all three with a meter - if they test good then you know it is the stereo and not a blown fuse etc in the car.
Most pros will hook up a trickle charger if they have to have the doors open or car on for any more than a little while to avoid this. I've had this happen to me a few times working on cars - not from rocking out on the customers stereo but from having the ignition on for a few minutes to test...
When car audio was still huge I use to install a lot of aux batteries for playing the stereo with the car off. Back then we used RV batteries or gel-cell batteries. They are suppose to hold up to many complete discharges. I think if you completely discharge a lead-acid battery it will never...
If it is only a 4 channel head unit you should be able to use a pretty small automotive battery to get an hour of play time. My job-site radio is basically a head unit with two speakers and I can get about 6 - 8 hours of play time from a 4 amp hour 12v power tool battery.
How long are you going to be using the motor under load at once? Think of it like a power window motor in a car. On an average day it is used for only a few seconds at a time under regular load and may draw 4 or 5 amps - no problem - wont overheat and burn. Problem occurs when you try to use...
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