Category Archives: Tube HandBook
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Fire up Low Profile Amplifier
Posted on February 19, 2012 by Akita in Tube HandBook#1 Fire up I will turn on my transformer just after every wiring was connected to the socket and before any tube or components solder in. This is to make sure the power transformer give the correct amount of output voltage we want. All the measured voltage is a bit higher. This is because it [...]
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Basic Electronic Formula
Posted on January 8, 2012 by Akita in Tube HandBookOhm’s Law Ohm’s Law defines the relationships between power (P), voltage (V), current (I) and resistance (R). Formula #1 Voltage – is the difference in electrical potential between two point in a circuit. V = IR V = voltage (measured in volts) I = Current ( measured in amperes) R = Resistance (measured in ohms) [...]
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Volt Ampere (VA) Story
Posted on September 6, 2011 by Akita in Tube HandBookVolt-Ampere (VA) Story A volt-ampere (VA) is a unit used for apparent power in an electronic circuit. The VA rating is use to indicate the limited maximum permissible current in a device. Defining the transformer current rating depend a lot on your amplifier circuit, classes and topology design. There is no one transformer suitable for all [...]
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Select a Correct Wire Gauge
Posted on September 3, 2011 by Akita in Tube HandBookEach cable use in electrical wiring must be able to handle the job assign to them. If the work load is heavier then what they can handle, it may lead to flaming of melting. Basically, 1 milimeter square of copper wire will be able to handle 3Ampere of current. You can choose the simple way [...]
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Standard Core Dimension
Posted on June 2, 2011 by Akita in Tube HandBookTransformer Core Dimension The EI Core name came from the shape of the laminate sheet which look like (E) & (I). The table below show the standard EI core dimension
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Measuring Transformer Ratio
Posted on March 17, 2010 by Akita in Tube HandBookTransformer (Voltage vs Turn vs Impedance) ratio Formula: Vp/Vs = Np/Ns = (Zp/Zs)1/2 Vp= Primary voltage Vs = Secondary voltage Np = Primary winding turn Ns = Secondary winding turn Zp = Primary impedance Zs = Secondary impedance Showing here is a very good formula which pointed the relationship between voltage, turn and impedance of [...]
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Power Transformer Calculation
Posted on December 3, 2008 by Akita in Tube HandBookPower Transformer Calculation Formula N = Winding turn E = Voltage f = Frequency of the main voltage, measured in Hertz B = Magnetic field strengh, measured in Tesla Afe = Core cross section area (cm2)
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