Electronic tube metering single output audio transformer winding method, Audio Transformer DIY
Keywords: electronic pipe metering single output audio transformer winding method
Electronic tube function release end output audio transformer winding method
General amateur winding output transformers do not have to pay too much attention to theoretical parameters and formulas, but three indicators must pay attention to: 1. Output transformer impedance. 2. Try to the amount of inductance. 3 Try smaller distribution capacitors. For the output transformer impedance, theoretically, the transformer impedance must be consistent with the internal resistance of the power amplifier, so that the maximum design power of the power amplifier can be achieved, but when the actual production is, it is often discarded for the best sound quality, so it is generally The impedance of the transformer is much higher than the biliary internal resistance. Take 805 tubes as an example. I usually take 3-5 times the gallbladder in the case of the transformer, because there is such a large margin, so as long as the data provided by the original designer is around, there will never have any problems . Try to the amount of inductance and as small distribution capacitance, the amount of inductance is low, the distribution capacitor is high, but it is a pair of contradictions, because the amount of electricity is large, the distributed capacitance is inevitable, to distribute capacitance Small inductance will also be small, how to solve this pair of contradictions, both of which are large, to maintain low frequency, and distribute capacitors to maintain a good high frequency, this is our winding output transformer to ensure sound quality The key is the key. How to solve this pair of contradictions? Let's talk about personal production experience in detail, please ask everyone to discuss.
1. To ensure that there is a large number of electrical motions, you must choose a large-specific iron core. Only the large-scale core is an important guarantee of large power, and the commercially available product is often low frequent, lack of elasticity, no impact Force, the important factors slower are all caused by the cost of cost savings, especially single-ended machines, because of the flow of gas seam, the iron core specification is certain, I used for 10-20W small The output of the power single-terminal machine will not be less than 35mm wide, the stack is not less than 65mm, ie 35 × 65 or more. The output cattle of high-power single-ended machine is generally 41mm wide, stacked 75mm, which is 41 × 75 or more to ensure that the output cattle has sufficient inductance, thereby ensuring that low frequency is good, elastic, and speed.
2. To ensure that the distribution capacitors are as small as possible: a. The windings should be wound by each winding. Generally speaking, the primary winding must not be less than 5-7 layers, and the secondary winding must be divided into 5-7 floors, sandwiched in the primary winding. Because it is a good pincique, and the distribution capacitance of each winding is in series, and the capacitor is smaller in series. b. Pay attention to the winding process, the technique is also an important measure to reduce distribution capacitance. First, the coil must be tightened when winding, the better, this is also the high-grade output cattle can only be wound by hand, but the reason why the machine is wound, but not necessarily arranged, there is a small number of landscaping The capacitors are the opposite. Second, the thinner, the thinner, such as winding experience, patience, better, brushing a layer, brushing a layer, but just starting to bypass the non-gelatin tape with ordinary encapsulation carton But you must use opaquely, transparent but not easy. For each layer, it is sealed with a sticker, and two layers of primary and secondary are large, because the film is thin and has a good fixed role. Third, the secondary windings are uniformly windy, try not to be over secret as the primary, but must tighten.
3. Wire selection: Because we choose the core, the corresponding window is large, bringing advantage to our use wire, generally selecting a high-strength paint line of 0.31-0.45mm in diameter, secondary selection diameter 1.2 -1.45mm high strength enameled line, depending on the iron core window. This specification wire can be tightened, and the DC resistance of the transformer can be reduced, thereby reducing the copper loss and iron loss of the transformer, which is very advantageous to improve the sound quality.
4. About the quality of the core: For a mounted master, a good iron core is equal to half. In addition to the size of the core, there is an important parameter, which is to choose 0.35 thick, the core of the thickness of 0.50 is only used as a power transformer due to eddy current, and cannot be used to output the cattle, if you can find 0.35 or less. The light-surface cold rolled iron core is better, but its silicon is not necessarily high, it is moderate.
5. About the skeleton: Generally, the skeleton of various specifications is available, it can be self-made, but self-made is more troublesome.
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