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Broken Cable Detector Circuit using IC CD 4069

This post is for Broken Cable Detector Circuit using IC CD 4069.

In this circuit there is no need to open wire to check.

It work like metal finder but find AC current in wire but not in metal.

It uses chip CD 4069 and this chip has small switches to turn ON light or buzzer.

If wire is good and has current then it beeps or lights up.

If wire is broken then there will be no beep and no light.

Circuit Working:

Parts List:

Component TypeDescriptionQuantity
Resistors (All resistors are 1/4 watt unless specified)
1M1
10k1
220k1
470k1
330Ω1
1.2k1
Preset 20k1
Capacitors
Ceramic 100nF1
Ceramic 470pF1
Semiconductors
IC CD 40691
Transistor BC5471
LED Red Green 5mm 20mA1
LED Green 5mm 20mA1
Diode 1N40071
Buzzer 5V1
Antenna 1
Battery 9V1

We can make easy broken wire detector using CD 4069 IC.

This chip has six inverters and are used in many circuits.

It can find EMF (electric field) from AC wire but does not show exact broken place.

If wire is cut with no EMF then there is no light or sound.

Parts R3, R4 and C2 make chip work like oscillator and gives signal around 1 kHz.

Transistor Q1 act like switch and is controlled by pin 12 of CD 4069.

LED1 turn ON when EMF is found on wire.

LED2 turn ON when no EMF is found.

Antenna is spiral wire which is about 15 cm long and do not touch live wire.

We can change circuit sensitivity using VR1 which is the variable resistor.

Be careful and always stay safe when checking AC wires.

Never touch live wire with bare hands!

Formulas:

1. LED Resistor RLED:

To stop too much current in LED then use this formula:

RLED = (Vsupply − VLED) / ILED

where,

2. Transistor Base Resistor Rbase:

To turn ON transistor fully with saturation, and use this formula:

Rbase = (Vin − Vbe) / Ib

where,

3. Timing Capacitor C:

If using timer circuit then use this formula:

C = T / (1.1 × R)

where,

Note:

Exact parts and layout depend on how we want circuit to work.

We may need to test and change some parts to get best result.

Use these formulas to start building and testing our Broken Cable Detector.

Always be safe when working with electricity.

How to Build:

To build a Broken Cable Detector Circuit using IC CD 4069 follow the below mentioned steps for connections

Q1 Transistor connections:

Safety Tips:

Conclusion:

This Broken Cable Detector Circuit using IC CD 4069 helps find broken wire without cutting or touching wire.

It does not shows exact broken place but it detects AC field near good wire.

Very useful for quick checking and repair work.

Better to ask help from a certified electrician when working with high voltage.

References:

Efficient Android Based Invisible Broken Wire Detector

Datasheet CD4069

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