Coal stove door automatic door remote control circuit

Cook in advance to open the door with a coal stove, before using the fire to be strong. Here's an automatic door opening device,
Coal stove door automatic door remote control circuit - schematic

it can automatically open the door before the regular home owner, eliminating the need for employers to fire doors and other fire exuberant time. The device structure is simple, easy selection, for the majority of users to burn briquette stove imitation. 18-42 is a circuit diagram stove automatically open circuit principle coil device. It is actually a voice circuit, coal stove. Timing open, use the alarm clock to control. The main part of the circuit is a monostable circuit VT3 VT2 constituted. Monostable circuit works is: after turning on the power, the power provided to the anode through a resistor Rs VT3 large enough base bias, like it is in saturated conduction state, the collector potential root low around 0. 2V about. While the collector potential VT3 through wind resistance and R, the partial pressure, the transistor provides a lower base potential vrz, it is in the OFF state. If the vote is activated external signal, this state (VT2i off, VT3 saturation) can be kept down, so called steady state. At steady state, the collector potential of the high VT2, VT3 base potential is low, and the capacitance of the collector VT2 G- termination, VT3 other end of the base, so there is a certain charge voltage G, electrode left and right is the positive or negative. When the wire VT2 collector and emitter instantaneous short circuit, VT2 set electrode potential by the sudden decrease, but the voltage of the capacitor G is not about the mutation, so VT3 base potential should be reduced, so that the VT3 is turned OFF . After VT3 end, the collector potential of the horse rises high, because the base potential VT2 VT3 is determined by the collector potential via a resistor Rs, flat partial pressure is obtained, so also with the electric potential base VT2 significantly increased, so the VT2 cut into saturation. Over time, the G charge charged through R5 and VTZ the e : c pole gradually bleed, the right end of the potential that is VT3 base potential coriander gradually increased, when raised to o. At around 6V, VT3 will begin conducting, the collector electric , digits begin to decrease, the wind, the partial pressure of goods, VT2 base potential to begin to reduce, VTZ began to withdraw from saturation, its collector potential began to rise, coupling G small-minded, and base potential VT3 further increases, VT3 further guide escape, leading to its saturation, leaving VT2 deadline, which will be restored to its original stable state. Visible, monostable circuit triggered by external signal (such as the use of wire momentary shorts VT2 c, after e :) poles can flip quickly from the steady state into another temporary state until after a period of delay, the fork re-turn back to the original steady state. The alarm clock is picked up by the microphone BM. Usually the impedance presented by the microphone is relatively large, the collector potential of VT1 high, the monostable circuit is in a steady-state condition. At this low collector potential VT3. VT4 is off, the relay does not pull. When the microphone being subjected to strong tones, the internal impedance dramatically smaller, this change makes C. The rapid increase in the potential of the left, the equivalent of the base of the transistor VT1 enter a positive pulse, so that the base potential of VTI's rapid rise, its collector potential decline rapidly. This change in voltage via a capacitor c2 transmitted VT2 collector, the collector potential VT2 has declined rapidly (the equivalent of VT2 c pole e very short answer it). So the one-shot circuit to generate inverted changes described above, the circuit immediately turn people temporary steady state, this time, a sudden rise in the collector potential VT3, VT4 causing saturation. So relay operation occurs, K Pull, the solenoid is energized to generate the operation, touched organ set on the door, so that in the spring to pull the door open under the force.

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