Assemble a timed electronic switch to the radio ----- Time Switch for Radio

Keywords: electronic switch circuit diagram Author: Xue Fu When using a radio, it often works for a long time, not only shortening the battery life, but also has a certain impact on the service life of the radio. These problems are solved if you add a timed switch. Now introducing you that the fingers are not only small in size (can be loaded into the radio), and it is also very convenient. Due to the high requirements of the circuit, only one TTL and non-door, TTL and non-door power consumption are small, so long-term connection does not affect the battery life. When the radio is needed, as long as the finger contacts the finger on the casing, the capacitor C1 is discharged by R2, so that the non-door input end is low, the output is high, the BG1 is turned on and is saturated. The battery powers to the radio via BG1. Since the BG1 is fully turned on, the voltage drop of the triode is only 0.1 volts, so the radio is almost all of the battery voltages. When the finger leaves the touch panel, the power supply is charged through the high resistance resistor R1 to C1. Since the time constant of the resistor R1 and the capacitor C1 is large, the voltage of the CL has risen so slowly, once the C1 voltage rises to the door of the non-door When flat (about 2.4 volts), the non-door output is flipped to a low level, the BG1 is closed, and the radio is closed. Be The timing control of the radio start time is determined to R1 and C2. However, in the actual operation, it can be controlled in accordance with the length of the referring to the time, because the residual voltage is low after the point is discharged, and it is high. By referring to the time length control C1 residual voltage to achieve the timing control requirements of the timer, this timer is queued, such as pointing for 1 second, the power is about 5 minutes, directs for 5 seconds, the power-on time is 35 minutes, this circuit Less components can be loaded into the radio. Refers to the middle of the φLOMM thin copper sheet after cutting with strong adhesive on the radio side, then introduced with a wire. In the process of use, if the timing time is needed than the machine, the capacity of C1 can be appropriately increased, but it is best not to exceed 470uf, when this value is exceeded, the capacitive volume will be large, and the pocket radio is not easy. enter. In addition, when the capacity of the capacitance is increased, its leakage amount is also increased, making the accuracy of the timer become very poor.

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