In case you did not know, rc cars have many interesting items. For instance, an oscilloscope is a very expensive tool.
There are many items like the oscilloscope and the RF tip, which will determine the rc cars performance. There is a circuit used to measure the output of an RF transmitter.
Single Circuit RF peak
In this circuit, C1 is 10nF/400V and each BY133 diodes with a reverse voltage capability 1.3KV.
More complete circui
This would be useful to us is the low power RF measures covering the frequency range of r / c:
Ø This serves as both the transmitter and the receiver. It serves to determine the frequency of the RF signal is at a given point of the circuit gives us an idea of how the filters and is very useful for focusing frequency transmitters and receivers.
Ø Field Strength Meter: It measures the range of a transmitter, allowing adjustments in the output stage of the same and thus get the most out of our pack of batteries.
Ø Recipient of the same frequency: This function performs well the frequency counter as the rc cars gauge field strength, if you did not have either of these two, the receiver would be very useful to know about the frequency of a signal and its intensity.
The charger
As the objective is to use the rc cars, it was taken into account that they are feeding 12V. In principle, this value is not enough voltage to charge a 3S pack as if we are charging 100% of the necessary tension "in the pack" will be of 12.6V and therefore the input voltage, being a linear regulator, it should be at least 1V above.
Lift DC-DC voltage
The circuit for the rc cars charger harmonization is based on the above, it is exactly the same as some values change, and has some more diodes in conjunction with a preset to regulate the output voltage (hence must be the "ADJ "). Once we have the power supply to operate the circuit using another integrated circuit voltage regulator and current, but in our case, we will use to limit the current to the value you want by means of resistors R25 and R26 in parallel.
We need a combination of rc cars resistors to obtain a value close to this. For this example if we put 4 resistors, two 1ohm in parallel with two 1.2-ohm resistor we have 0.2727 Ohms. Finally we have 4 resistors in parallel, 2 1 Ohm and two of 1.2 Ohm.
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