This is a simple sine wave generator that out of 30MHz,15MHz as main components is IC-number NE602, that is a Double Balance Mixer type IC to make as sine wave circuit. The internal structure of this IC will include the The front-end, including receiver and transmitter sector.Thus making relatively high frequency applications. Model of the circuit in this section, see Figure 1.
Figure 1 Sine wave generator circuit with double balance mixer IC
In circuit will find that differences with circuit from presented comes. Because Making frequency or Determines how often is used will use Inductors and variable capacitors instead there will be the following formula.
f = L1/VC1 …….(1)
f = Desired frequency is measured has unit is Hz
L1 = Inductance is measured in Henry.
VC1= Capacitor is measured in Farads.
Suppose, We use L1 value 1.5 uH and VC1 value 50pF the frequency output will equals 30 MHz or the center frequency will equal 15 MHz for application.
L1 is used we have to do point tap. For the feedback signal. Which point is that this is about ¼ or 1/5 cycles, from positions to ground. The frequency output that out of pin 7. That will must pass C5 before. Therefore is to be used. For the value of C5 will reference with VC1 there. The C5-capacitor will has no more than 15% of VC1. Suppose, If VC1 has value of 100 pF. The C5 will equal 15pF.
The application of this circuit can use easily instead the frequency generator of crystal , Piezo, LC circuit.
How to build.
This project is a few components thus can build on an universal PCB board. As Figure 2 is components layout and The wiring But look out carefully for is the polarity of the electrolytic capacitors, resistors, and pin of IC1 correctly.
Figure 2 The components layout and The wiring
The components List
Resistors size ¼W +5%
C1, C2__________0.02uF 25V__Ceramic
C5_____________ See text
IC1____________NE602 Double Balance Mixer
Socket 8 pin____1 pcs
The universal PCB board________1 pcs.
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