Feature
Board size:9.1*4.7cm
Power supply voltage:DC5V
Circuit description
Q1 and Q2 form a secondary audio amplifier circuit. The audio signal received by MK1 is coupled to the base of Q1 via C1. After amplification, the collector is fed directly to the base of Q2. A negative square wave is obtained at the collector of Q2. To trigger the bistable circuit. R1, C1 limit the frequency response of the circuit to about 3kHz for the 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 MK1 receives the control signal, it outputs a negative square wave after two stages of amplification. After differentiation, the negative spike is added to the base of Q3 through D1, which causes the circuit to quickly flip and LED1 is lit. When MK1 receives the control signal again, the circuit reverses and LED1 goes out.
Package includes
1 x DIY KIT
Additional information
| Weight | 0.022 kg |
|---|
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