* Question
| What are the analysis of the diode VDl temperature compensation circuit? |
* Answer
| (1) The positive pole of VDl is connected to the DC operating voltage y through R1, and its negative pole is connected to the ground through R2, so that VDl is in an on state under the action of the DC operating voltage of 4-V.The key to understanding diode conduction is that the voltage on the positive pole is higher than the voltage on the negative pole.
(3) The tube voltage drop temperature characteristic of the diode can correctly explain the role of VDl in the circuit.Assuming the temperature rises, according to the characteristics of the triode, the base current of VT1 will increase.It can be seen from the above analysis that after adding the diode VDl, the original temperature rises to increase the VTl base current, and now the VDl circuit can reduce the VTl base current by a certain amount, so as to stabilize the base current of the triode VT1, soVDl can function as a temperature compensation.When the diode VD1 is connected, when the temperature drops, its tube voltage drop increases slightly, so that the VTl base DC operating voltage rises, and as a result, the VTl base current increases, which can also compensate for the instability of the triode VTl temperature drop.. |
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