PACTF，Polymer cured Amorphous Carbon Thick Film resistor.
Compared with the first generation "gold" carbon resistor, the principle remains unchanged, but the process becomes more pocket-sized.
Try to mix nano silicon dioxide into the resistive substance according to the original formula, and the resistance value is obviously increased. Connect this resistor to 220 volts, and the heating power is about 1 watt. After more than ten seconds, the resistance obviously heats up, and the resistance value has an obvious trend of upward change(+5%).
In addition, the resistance value of this kind of resistor will gradually and slowly decrease to a stable value within several weeks at room temperature, which may be related to stress and so on.
However, the mechanical strength of the resistor paste is enhanced by adding silicon dioxide, and a higher proportion of silicon dioxide filler is used in the shell to reduce the effect of stress on the resistor film, so the resistance value decreases very little. After just maded 48.9 kΩ, the resistance value is stable at 48.4 kΩ after 45 days. Has preliminary practical value.
Mark the resistor with a water-based pen, and coat it with insulating paint after drying, which will make it look beautiful and the mark will not be erased easily.
It is welded in the circuit of the electron tube radio and works normally. Although it is a amateur miniaturized version, the size is still much larger than that of the industry finished product.
Compared with the first generation "gold" carbon resistor, the principle remains unchanged, but the process becomes more pocket-sized.
Try to mix nano silicon dioxide into the resistive substance according to the original formula, and the resistance value is obviously increased. Connect this resistor to 220 volts, and the heating power is about 1 watt. After more than ten seconds, the resistance obviously heats up, and the resistance value has an obvious trend of upward change(+5%).
In addition, the resistance value of this kind of resistor will gradually and slowly decrease to a stable value within several weeks at room temperature, which may be related to stress and so on.
However, the mechanical strength of the resistor paste is enhanced by adding silicon dioxide, and a higher proportion of silicon dioxide filler is used in the shell to reduce the effect of stress on the resistor film, so the resistance value decreases very little. After just maded 48.9 kΩ, the resistance value is stable at 48.4 kΩ after 45 days. Has preliminary practical value.
Mark the resistor with a water-based pen, and coat it with insulating paint after drying, which will make it look beautiful and the mark will not be erased easily.
It is welded in the circuit of the electron tube radio and works normally. Although it is a amateur miniaturized version, the size is still much larger than that of the industry finished product.
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