![]() If you can’t find one, you obtain very good results with a piece of isolated copper wire, about 60 cm long (the optimum length to be found experimentally). * The telescopic antenna taken from a disused device can be used. The figure below shows how the single transistor radio can be made, we can clearly see that it just involves a single transistor as the main active component.A regular type of MW antenna coil has been used for collecting or sensing the MW receptions. If this cannot give the desired results, new coil must be made. If the coil is stretched the inductance decreases, and vice versa. During the setup of the bandwidth, the inductance of the coil can be altered by changing the distance between the quirks. ![]() The practical realization of this coil is explained in text connected with Pic.3.45. * The coil L has 4 quirks of lacquer-isolated copper wire (CuL), bended to have a 4 mm internal diameter. When all the trimmers from the circuit on the Pic.3.8 are set to minimum capacitance, the capacitance between the FO and G legs should be adjustable between 7 and 27 pF. The legs marked as FO and G were used, the G leg being connected to the ground. During the testing off this device, we were using the capacitor from Pic.3.8. * The capacitance of the variable capacitor should be able to change from a couple of pF (Cmin) to app. A soon as this occurs the transistor switches ON via the 47k resistor making the pulse by means of the inductor which draws back a negative pulse to the base of the. However, the circuit works well as a transmitter when I connect an audio jack to the antenna.Attached is my circuit. The following single transistor FM bug circuit might be known given below: When turned on, the capacitor 22n prevents the transistor from switching until it becomes charged. But I build the circuit and hook the output to a high impedance headphone, no radio reception whatsoever. ![]() the information being used in the transmitter to perform the modulation, is extracted on the R1 resistor, and being led from it to the high-resistance headphones, over the coupling capacitor C1. 1 Gents, Why isnt my single Transistor FM Radio work My simulation with proteus shows signal at resonance. The resonance frequency of this oscillator is being set by C to correspond to the one of the station that we wish to hear (meaning it has to be altered between 88 and 108 MHz). The T2 transistor together with the R1 resistor, the coil L the variable capacitor C and internal capacitances of the T1 transistor, comprises the so-called Kolpitz oscillator. On Pic.3.43 you can se the electronic circuit of an extremely simple direct FM receiver. Since the FM band is almost entirely filled with radio stations, we will be providing.
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