What is a film capacitor?
Film capacitors
are a structure in which the dielectric is made in the form of a film.
... Film capacitors
are used in DC blocking circuits, filters, automatic frequency control circuits, power supplies, backlight circuits, etc.
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Car radio, we provide uninterrupted power supply...
All car enthusiasts know very well that when the car’s ignition is turned on, when the starter is turned on, all consumers are turned off, including the car radio Some discomfort occurs. For example, if a flash drive or disk was playing, then when the car is started they turn off for a couple of seconds, which then leads to the radio turning on again and reading (new) information. And the song or the track being played starts playing from the beginning, and sometimes the entire disc... So, it was precisely to solve this problem that this scheme, so to speak, was developed.
We solder the diode along the positive wire, otherwise when setting the car alarm, you will need to wait a certain time until the capacitor is discharged. Each radio tape recorder works differently, that is, the loading time of a disk or flash drive is different for each radio tape recorder, and the power consumption is also different, in connection with this you may have to select a capacitor specifically for your radio tape recorder, increasing the capacitance of the capacitor, thereby increasing the operating time of the radio tape recorder to several seconds , while starting the car (when the power is lost).
Any car radio has a connection diagram or such information is included in the description. The “plus” of power is also “Power”, usually red, and the minus (Ground) is always black. On the capacitor it is written where the plus is, so we connect plus to plus, minus to minus. Well, that seems to be all.
If the first scheme does not work for you, then the second one works perfectly.... The duration of the radio without power depends on the capacitance of the capacitor; the larger the capacitance, the longer the radio will work.
Here's another option...
———The solution was, as always, simple - a capacitor! After experimenting a little with the values of the resistor and capacitor, I made the following circuit. The shutdown delay is about 5 seconds.
The diode is needed so that when the engine starts, the capacitor gives its charge only to the radio and nowhere else. The resistor is needed to discharge the capacitor after the key is turned to the LOCK position, so that the radio turns off.
Because Each radio is different, so you need to select the resistor and capacitor values individually. If the radio manages to turn off when the engine starts, increase the capacitor capacity. If the radio continues to work for too long when the key is removed from the ignition switch, reduce the value of the resistor, but do not get carried away too much, do not set it below 4.7 Com, otherwise the resistor will heat up.
In order for anyone to repeat this scheme, I signed all the components.
This is what should happen in the end
Tighten with heat shrink and you can install
Source
Eliminating the radio turning off when starting the engine
Hi all! Improvements that will make using the car more convenient. The point is that at the moment the engine starts, when the ignition key is turned to the “starter” position, all electrical consumers are turned off, except those responsible for controlling the engine. The point here is not a weak battery; this was done by the Japanese specifically to make starting the engine easier. As a result, the radio tape recorder temporarily stops playing and so does all consumers, like the multimedia system for rear passengers too - accordingly, if you turn off the engine at a gas station, even prudently leaving the key in the ignition position (ACC), then when you next start the engine, everything will still turn off and , if the rear passengers were watching a movie, then it is reset and you need to turn it on again and rewind it to the place where they were watching - the passengers get nervous and swear. Since all the comfort is for passengers, we are correcting this shortcoming.
