In audio terms, this equates to 12dB of volume attenuation, just enough to get us to an average guitar output level. The Edcor PC10k/600 transformer included in the LINE2AMP kit has a turns ratio of 4.1:1, so the output signal is 4.1 times smaller than the input signal. If the turns ratio is 2:1, the voltage induced in the secondary will be half of that in the primary. Edcor PC10k/600 transformerĪ transformer reduces or increases the voltage of a signal in direct proportion to the turns ratio. Since the issue at hand is volume, let’s discuss voltage for the moment and leave current and impedance for later. 1) The grounds are isolated (which will be important for solving another reamping problem), and 2) the voltage, current, and impedance are transformed in proportion to the ratio between the number of turns of wire in the two coils (the “turns ratio”). From our point of view, two important things happen to between the input and output of a transformer. The alternating current running through the “primary” (input) coil creates a magnetic field which induces a corresponding voltage in the “secondary” (output) coil. A basic transformer such as the one we’re using consists of two coils of conductive wire wrapped around a magnetically permeable core, usually iron. Transformers operate according to a funny feature of our universe called “electromagnetism” by which a changing electrical field induces a changing magnetic field and vice-versa. To understand how we can use a transformer to attenuate the signal, let’s look at how transformers work.
#Reamp box wiring no transformer license
Modified and reused under the GNU Free Documentation License
However, since we’re already using a transformer to address the other two problems of reamping, we might as well use it to reduce the voltage as well. The clear choice for attenuating voltage (“volume” in audio) in terms of cost and complexity is a couple of resistors set up as a voltage divider. So, in order to to mimic the output level of an average guitar, we need to attenuate our line-level signal somewhat before sending it to an amp. Guitar signals, on the other hand, vary between a few tens of millivolts rms to 1 Vrms or slightly more depending on the pickup.
#Reamp box wiring no transformer professional
The nominal level for a professional line-level signals is +4dBu, or approximately 1.2 Volts rms. Let’s look at the ways a humble audio matching transformer can make reamping a consistent and transparent process.
In order to do this, we need a device that addresses the following issues: However, what we want is to be able to plug any line-level device into any instrument-level input and have it sound right every time. This is true in many cases, simply plugging the output of your interface into an amp and crossing your fingers is good enough. Why do we need a reamping box? People have been plugging line-level signals into guitar amps since long before the first reamping box hit the market, often with good results.
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