Circuit of Free Debug FM Transceiver composed of BA1404 and TDA7021

Published:2011/4/26 9:01:00 Author:TaoXi | Keyword: Free Debug, FM Transceiver | From:SeekIC

The most important features of this device are easy to make, it does not need to debug, especially this device does notneed the double-variable capacitor and intermediate frequency transformers, so it is very suitable tomake by the radio amateurs. Figure (a) is the receiving circuit; Figure (b) is the transmitter circuit. When this circuit is transmitting the frequency of the signal 88 to 108MHz, the L2 use Φ0.65mm diameter enameled wire wound into 8mm, 10 turns of hollow coil. And the L3 use Φ0.6mm diameter enameled wire wound into 6mm, 8 turns of hollow coil.



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