This is a Simple IF signal generator circuit using CMOS IC CD4011-CD4040 and crystal-3.579 MHz into output AM: frequency 455 KHz

In the event of AM radio repairs, basic tools that are usually found the IF signal frequency generator is used to determine the function of various sectors. Which these circuits are often used transistors, built frequency. But we use innovative circuit used IC and crystal as circuit in Figure 1.

Figure 1 The circuit diagram of Simple if signal frequency generator using CMOS IC

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How it works

The working starting at IC1/1-IC1/3, R1-R2, C1-C2 and crystal are connected as the square wave frequency generators circuit. Which has a frequency of 3.579 MHz.

This frequency will out to pin 10 of IC1/3, before in to pin 12 and pin 13, then out to pin 11 of IC1/4 is finally.

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In the section of IC1/4 that see will be connected as a buffer circuit to serve as a buffer. between IC1/3 and IC2 Not interfere with each other.

The frequency 3.579 KHz at IC1 will be connected to pin 10 of IC2 acts as the frequenct divider by value 2 to the power of three. (8).

Which this IC2 will have the ability to Division, Up to 2 are 12 (4096).

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After dividing the frequency will be reduced to 447.4 KHz. Which error of the frequency 455 KHz is 2 percent out to pin 6 of IC2.

Then will pass the low pass filter circuit of 3 set. To filter harmonics On leaving before will appears at output for use.

By output will be a sine wave at load 10 Kohms will be size about 35 mVp-p.

How to build

This circuit is not used a lot of parts so can assemble on a universal PCB board. Then, the wiring for circuit wiring and various components can view of the example in Figure 2.

Be carefully for is the polarity of the electrolytic capacitors correctly. Pin of the IC is not an error.

Figure 2 The wiring for this circuits

The components layout

Parts you will need

Resistors size ¼W +5%
R1: 4.7M
R2: 1.5K
R3-R5: 4.7K

Capacitors
C1, C2: 22pF 50V, Ceramic
C3, C4: 0.1uF 50V, Polyester
C5-C7: 470pF 50V, Ceramic
C8: 0.001uF (102) 50V, Polyester

Semiconductors
IC1: CD4011, Quad 2-Input NOR Buffered B Series Gate
IC2: CD4040, 12 Stage Binary Ripple Counter DIP-16

Others devices
XTAL1-crytals 3.579 MHz, 1 pcs.

Check out these related signal generator circuits, too:

• XR2206 function generator circuit
• Simple IF signal generator circuit using CMOS IC
• ICL8038 Mini function generator circuits

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