BA1404 Stereo FM Transmitter small

In this paper, we show a kind of a small core BA1404 FM stereo transmitter, a lot of friends because he is very keen, and it asked me the information, so put put it up. In fact, on BA1404 used in many electronic magazines and newspapers more than a briefing, not really nothing new, but he really practical.

ROHM BA1404 produced by the U.S. FM radio transmitter ASIC; its high integration; required external components; work reliably; supply voltage to adapt to wide range of work was still as low as 1.5V, making it suitable for amateur conditions a variety of radio transmitting devices. Since I no scanner, we can only draw in PROTEL in a typical circuit in the painting in the WORD of its internal functional block diagram and pin description of plans to introduce, said the circuit with high sensitivity FM radio range can reach 1000 meters, you can go to trial, as shown in Figure one. Internal structure and the pin is shown in Figure II. In particular 38KHz crystal cross hard to find, can balance the capacitance of a 57P 5,6 feet circuit can replace the work between the only D effect is not too obvious too!

You can make with his own small sound of a radio station it! Note that the original used in the power amplifier stage transistor as 2SC8050 2SC8050 fact we all know about the maximum frequency of 100MHz, where use is inappropriate, due to excessive power consumption and a sharp fever burned in a short time better to use homemade 3DG130C or 3DG12C other domestic cooling cap in the power tube to a better performance, such as the use of Taiwan's D40, D50 and other specialized launch tubes would be better if only the work that needs new adjustment. Note: Due to my negligence not connected to the power amplifier stage should be connected to the upper part of T1 +4.5-6V power supply terminal on the basis of the last circuit to increase the output filter circuit, the circuit is more perfect, the frequency performance is better.

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