FM transmitter circuit without coil
Basic Circuits
This is FM transmitter circuit without Coil,using inverter digital IC as main and controlled frequency is precise by crystal. Figure 1 the circuit diagram In Figure 1 is RF oscillator circuit which use a inverter IC1/2 and ceramic crystal filter 10.7 MHz to use drive IC1/4 – IC1/6 by through IC1/3. When inverter in parallel form this impedance output is low thus they can drive directly an antenna. When output of IC1/4 – IC1/6 are square wave which have much more internal harmonic. The harmonic number 9 of frequency 10.7 MHz (96.3 MHz) will take place at the center of …
Long range fm transmitter circuit,2W(2 km) 88-108 MHz frequency VHF
Mini Projects
This is long range fm transmitter circuit in VHF range. As Figure 1 Sonar with up to 2 watts, when used with a supply voltage of about 24V. In the case of applications typically do not want a high transmission. This circuit requires only one power supply 9V Only. If used voltage level of the power supply more than 10V. We need a heat sink to transistor-Q2, To prevent this transistor overheating. Figure 1 the schematic diagram of 2W(2 km) 88-108 MHz frequency VHF/FM transmitter First, try entering the power supply to the transmitter with the 9 volts battery rectangular …
The twin-T complementary amplifier circuit with filter selector
Basic Circuits
The filter circuit of this main circuit will sent to through to the signal that middle frequency. At the same time is attenuated the others frequency into input signal to R1 through the base of emitter circuit as complementary form (T1/T2). And the feedback from the emitter lead of T1 and T2 through twin-T to input of the complementary amplifier (T3/T4) at others frequency from feedback. Then, out to the collector lead of T3 and T4. By there are the phase opposite the input signal. Thus, at a moderate frequency of the twin-T has been reduced significantly. Therefore, The signal …