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Quick Details
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D/C:
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NEW
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Place of Origin:
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Johor, Malaysia
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Price:
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please contact us
Quick Details
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Brand Name:
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dt830b digital multimeter
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Model Number:
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dt830b digital multimeter
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Type:
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Other
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D/C:
-
NEW
-
Place of Origin:
-
Johor, Malaysia
-
Price:
-
please contact us
Working voltage: DC3V-5V
Work effect: clap your hands once, the LED will be on, and then turn off, this cycle, high sensitivity, can be controlled by clapping your hands about 4 meters
Circuit description: This circuit is mainly composed of audio amplifier circuit and bistable trigger circuit. Q1 and Q2 form a secondary audio amplifier circuit. The audio signal received by the MIC is coupled to the base of Q1 via C1.
After amplification, the collector is directly fed to the base of Q2. A negative square wave is obtained at the collector of Q2. To trigger the bistable circuit. R1 and C1 limit the circuit frequency response to about 3kHz, which is a high sensitivity range. When the power is turned on, the state of the bistable circuit is that Q4 is off, Q3 is saturated, and LED1 is off. When the MIC receives the control signal, it outputs a negative square wave after two-stage amplification. After the differential processing, the negative sharp pulse is added to the base of Q3 through D1, causing the circuit to flip quickly and the LED is lit. When the MIC receives the control signal again, the circuit flips again and the LED goes out. If the LED lamp loop is connected with other circuits, it can also realize the sound control of other circuits through J2.
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