Position: Index > Transmitter Circuit >

Introduce the principle of FM transmitter Bug

2016-04-04 22:00  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

 This article is to introduce the principle FM transmitter Bug. The principle of combining text comprehension is a good suggestion. This small transmitter uses a Hartley oscillator. Typically, the storage capacitor circuit connected to the base of the transistor, but in the VHF base-emitter capacitance of the transistor as a short circuit, so in fact, it still is. Turn wire wound coil is four quarter-inch of 18 swg before. Taps antenna is a half-turn from the supply side. Audio sensitivity is very good when using ECM microphone inserted. The FM transmitter is an important component is  BC547 .BC547 have what characteristics:
• NPN Silicon Epitaxial Planar Transistors.
• These transistors are subdivided into three groups A, B and C according to their current gain. The type BC546 is available in groups A and B, however, the types BC547 and BC548 can be supplied in all three groups. The BC549 is a low -noise type and available in groups B and C. As complementary types, the PNP transistors BC556 ... BC559 are recommended.
• On special request, these transistors are also manufactured in the pin configuration TO-18.

 

FM  Transmitter Bug

 

 

 


Reprinted Url Of This Article:
http://circuits.radio-electronics.co/radio-rf-wireless/fm-transmitter-bug/