The 800MHZ FM circuit

Published:2011/7/29 4:36:00 Author:Borg | Keyword: FM circuit | From:SeekIC

This is the 800MHZ FM circuit. The circuit changes frequencies by changing the capacitance between the poles, which is done by changing the basic bias of the oscillating transistor with the modulation signal, and the signal can be received by the receiving circuit of the radios, the transmitting range is between 50 and 100m. To get a larger frequency drift, the volumes of C4 and C5 should be small. The inductance of L1 would better be 0.3μH or so, as TV1 is easily affected by the pole capacitance and the parasitic capacitance, so the coil should be hollow, and the tightness of the wire is regulated meanwhile so that the best inductance can be got.



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