Line Production Converters
Line output converters (LOCs) are accustomed to transform a relative mind device’s presenter outputs or the outputs of a OEM amplifier into an indication suitable to drive the preamp inputs of an amplifier. Many line production converters (LOCs) utilized in days gone by years that are few made for high production mind devices.
The presenter production of a top driven mind device is made to run in a configuration that is bridged. The presenter cables through the mind device each have actually 50 % of the DC battery pack voltage to them as soon as the mind device is on. Once the mind product is down, the voltage regarding the production cables is 0 volts DC. Once the mind device is started up, the DC voltage immediately changes from 0 volts DC to 1/2 associated with the battery pack voltage.
Construction: First, let us consider the many fundamental line production converter. Usually the one below wouldn’t be appropriate to convert the presenter production from any mind device or amplifier who has DC biasing (1 / 2 of the B+ voltage) on its presenter terminals. That one will act as a voltage divider (covered in the Resistors web web web web page) to reduce the signal simply level. These can work with some OEM amplifiers but should oftimes be prevented for many installs. These haven’t any transformers so that they cannot offer any isolation and should not effortlessly block the pulse of DC that DC biased amps could have. The high-power line production converter is way better designed for those.
A top driven line output converter consists, mainly, of the transformer and sometimes a higher energy resistor (commonly a10 watt resistor). The resistor is employed to load the amplifier within the mind product. Some amplifiers will display lower than perfect ways if they are unloaded. Understand that we said that the pinnacle product’s outputs had a sizable increase that is quick DC voltage whenever head device is started up. The transformer will pass the distinction in voltage between your two input terminals. Because the DC voltage increases simultaneously on each of this input terminals regarding the relative line production converter (and then the transformers within the converter), the pulse of DC is canceled away. In the event that line production converter just utilized resistors as being a voltage divider (without any transformer), the switch on pop music will be serious for the majority of amplifiers.
Another advantage of making use of transformers into the converter is the fact that it allows the shield ground in the production associated with converter to float. Which means that it could be grounded to your true point in the car and you will have no possibility of producing a ground cycle involving the production shield ground and also the mind device’s ground.
Shield ground wires: you can find frequently a few additional wires on a line production converter (frequently brown in color). These cables are acclimatized to ground the shield regarding the RCA production cables to your relative mind product. Some amplifiers work fine without them, other people do not. In the event that converter is set up behind radio stations, i recommend linking the shield ground cables to your full instance associated with radio. The second diagram shows a schematic diagram for a line output converter that is simple.
Note: The pictures above/below shows the loading resistors. They are made to withstand the voltage from a mind product ( some are built to withstand a little more and they are designed to be utilized with tiny vehicle amps). Many individuals desire to make use of line production converter with a house stereo receiver. It is not generally speaking a good notion. Residence stereos are made to create ranked energy into greater impedance lots. Which means they typically drive greater voltages in to the speakers. The line production converters created for automobile audio typically handle the power cannot that house amplifiers/receivers can drive into them. This, at the least, can destroy the converter. At the worst, it can be a fire risk.
The image that is following just exactly exactly just what the within of a simple line production converter appears like.
This next line production converter is a little different as compared to past one. That one adds the capacity to create a remote turn-on production. If the converter gets an input with DC bias, it drives 12v into the output that is remote (blue). The B+ and ground cables needs to be linked for the output that is remote the Light-emitting Diode energy indicator to the office. The 2 potentiometers close to the RCA jacks are level settings for the preamp outputs. This converter does not have the loading resistors or the shield ground cables that the past converter had.
This is actually the label through the converter above.