Type:Logic ICs
Condition:New
Electronic parts / ore machine, ore radio dedicated 200K core transformer [strong recommendation]
12 yuan / only. (the size of a coin in the picture is used)
This is a specially designed core transformer for the ore radio, matching for the highly sensitive SHH-1, SH-091b, SC2-300 headphones, excellent sound quality, high efficiency.
Recommended usage:
Yellow winding is the secondary, the wire has a white casing, then the headset. Can be used with a simple model of mutual inductance, can also be used in the primary series secondary coupling mode.
Several schemes of 185K, 208K, 160K and 180K are changed respectively, which are the measured values and the measured values of the bridge under the 1000Hz frequency. Actual headphone impedance and the nominal value will be in and out, the results will be in the moderate range.
The primary series secondary needs attention to the direction, to the same side of the foot connected. The efficiency of the model is a little high, the actual difference is very small. The greater the impact is the distribution of capacitance. Two kinds of distribution capacitance is different, need to test and contrast, in order to determine which kind of model is better.
Index:
Primary resistance: <4200 Europe
Secondary resistance: <30 Europe
Secondary inductance: >3.5 hang (100Hz bridge frequency measurement)
Tone quality
According to the calculation of secondary inductor connected to the 700 ohm 3.5 Frederick headset, low working frequency can reach 32Hz level have a fever effect; then 600 more European headset can reach 28Hz. Although it is difficult to send the tongue spring headphones so low frequency, but the overall bass can be greatly improved, the amount of bass, low frequency phase shift distortion reduction, increase the beauty.
Focus on the highest sensitivity of the SHH-1, too small inductance of the transformer will make the SHH-1 bass is not as good as SC2-300. Now this transformer inductance is very large, so it will not lose the bass. SHH-1's bass is better than SC2-300.
Efficiency:
This is a very efficient transformer. Add two to pick up transformer (Figure b), hypertension and normal (figure a) than just losing a small amount of bass voice is not so powerful but still good, other voices in the treble, difficult to hear the difference, illustrate the efficiency of this core transformer is very high.
Ordinary transformers are far from this level. Even if there is a good oriented silicon steel transformer, the two also want to lose about half the volume.
Tap:
Tap to reduce efficiency, this product does not use. For example, the original can be with a thick line around 1000 turns, now thin wire 2000 turns, and idle 1000 turns not only intermediate tap. This is obviously reduced efficiency, resistance, coil still idle loss increase, but also reflect the distributed capacitance several times. The wave impedance of a machine for ore grade 100--300K are good enough.
If you want to experience the effect of different impedance, you should replace the transformer. Different impedances have different optimum volume of transformer. Do not recommend switching taps on the same transformer control.
Other headphones:
As long as the AC impedance is not too far away from the headset can be used. Electromagnetic headset impedance DC 65 Euro 300 European, right. The new phone headset impedance DC 120 Euro about 150 euro, two series is more appropriate. The sensitivity of the headset is not as good as recommended, the strong signal when the volume is too large to avoid.
Technology
The owner controls the different volume and ratio of the transformer to choose this program. The first is for the high sensitivity of SHH-1, SH-091B, SC2-300 headphones, two series is 700 or 600 in europe. The second is to match the ore machine to the best 100--300K impedance. The high impedance will lose too many high notes because of the distributed capacitance. Low impedance will decrease the detection efficiency. Volume and large distribution capacitance becomes larger, the efficiency is reduced. Small size and small inductance do not line too small resistance too much.
Line package is the strength of the factory, small number of turns. The core is installed by the owner himself. After the match, the core of running, let the inductance multiplied (the factory does not do these work). Two pairs of EE25 cores for each transformer. Fixed core with narrow tape with increasing pressure, reducing the air gap. Between the magnetic core and the wire and loose clearance, usually without fixed. If there is a strong earthquake need to be installed with a soft pad on the fixed.
