Reading car audio noise processing gm tech2 Candi several methods

In the use of car audio or car audio gm tech2 Candi modification after, sound can produce many kinds of noise, the noise can affect quality, reduce sound index, and even make the whole sound system can't normal operation, in view of the acoustic noise problem, this section the author will introduce the main source of acoustic noise and basic elimination method!

A, the source of noise
Noise can from the following way intrusion car audio system.
1, intrusion power cord (through the host and power amplifier power supply cord into the system).
2, through the ground current (through the antenna of the earth and of the power amplifier ground).
3 and the other wire harness induction (through the antenna receiving and the original vehicle wire harnesses induction).
4, with electrical interference (electric horn, motor, etc.).
1, 2, 3 item is correlated gm tech2 Candi  with.

Second, the countermeasures to cope with noise
General deal with noise used parts, auto capacitor or coaxial car capacitor (cope with high frequency noise is particularly effective), e flow ring (inductance), LC filter, ground line, diode, etc.

1, deal with ignition system produced by the noise
Check the ignition coil positive on the capacitor is installed, such as the installation of inspection capacity is reduced, if capacity reducing platinum contact easy ablation, produce interference spark, need to change electric capacity is 0, 5 UF / 400 v non-polar capacitor.
Check the ignition wire whether to use carbon line, if use wire type easy to produce interference, the radio is part of the interference is serious, so must be replaced.
Can use increase the damping resistance method, inhibit spark noise, the method is to use 1 megohm resistor cascading in ignition coil output main wire in, reduce interference.

2, motor noise ruled out
The audio equipment and signal line gm tech2 Candi  away from motor and motor line, can use one non-polar capacitor parallel in the motor at both ends, also can use first two inductance respectively in series motor is negative line, garnish with two nonpolar capacitance respectively joint in the motor is negative line, the other end ground form filter circuit, the function is absorption motor carbon brush spark to reduce noise.

3, to no relay electric horn produce noise, elimination method basically has the following kinds:
In the one horn of the terminal on and pick a capacitor.
In the one horn of the terminal first series a inductance, again on and pick a capacitor.
In two loudspeakers terminal separately on the method of use.
In the steering wheel of the horn button contact between parallel a capacitor.

4, to relay electric horn produce noise, elimination method basically has the following kinds:
Electric horn support and body GM Tech 2  should be good contacts.
In the relay contact both ends, parallel a capacitor, or in contact both ends were on parallel a capacitor.


5, bad earth can produce noise.
If front cover not firm ground, the whole front cover will become a antenna, all the car noise radiation into the surrounding space, and from the antenna and the circuit into a sound system. Front cover and body adding connecting wire, necessary to contact the paint, oil stains, dirt and eliminate.
Engine (engine) and the body, or the front suspension, body between, exhaust pipe and between body should have good connection.