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Look for the top rc helicopter controller! When the enable terminal (LE - Latch Enable) is set to 1 the eight bits present at the inputs (pins 2 to 9) go to the outputs. When this pin enables returns to zero the present data is retained and does not vary even when the inputs change. Thus we have that with a simple signal of eight bits retain independent control. Using four of these circuits in parallel and independently controlling the enable inputs (LE) we expand the capacity of lines 8 to 32. It is noteworthy that these latches need to have forced a low logic state at rest to avoid erratic behavior. This is accomplished by twelve 10K rc helicopter resistors that can be seen in the bottom of the chart. Something to keep in mind that does not appear in the scheme is that each should be built close to the one 100nF capacitor to filter food. If you want to extend much the cable that connects the logic board (this) with the power it is advisable to place the output of each latch octal power amplifier (a ULN2803A, for example) so that the connection does not appear to be efficient and disparate rc helicopter circuit performances. RDS Decoder It has long been seen in the country's commercial transmission equipment capable of sending frequency modulated coded signals as a transmission medium using the same carrier that used for conventional audio signal. The technology of rc helicopter transmission is called RDS, English Radio Data System, as expected; there are specific integrated circuits that enable reception and decryption. On this occasion, we use a SAA6579T, which requires very few external components to work, and these components are all liabilities. Learn how to connect a decoder to a traditional reception. It should be noted that if there any low-pass filter, high or band receiver module should take the signal before it. Once decoded the RDS signal (if any signal in the broadcast) the data displayed by the serial data out pin, while the timing is set by the clock signal present at clock out. The figure shows the electronic circuit diagram. The signal multiplex, MPX, de-modulated, but without filtering is applied to the decoder through the MUX input (pin 4). This signal has a bandwidth of 60 KHz and FM receiver provides. With respect to bandwidth, it is essential that the MPX signal arrives unfiltered, that is, must contain the 57 KHz component that contains the RDS. On this signal does not allow any kind of filtering, so we must ensure such requirement when choosing the point of extraction of the signal from the FM rc helicopter receiver.
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