Function description: After the power is connected, the left and right two red LED (can be replaced by other color LED) flicker alternately.
Multiple cycle, the higher the power supply voltage, the brighter the LED, changing the electrolytic capacitor capacity can change the speed of alternating flashing, the greater the capacity, flashing.
The slower the blinking speed is, the smaller the capacity is and the faster the blinking speed is. The circuit is simple and easy to understand.
Especially suitable for friends and students who are beginning to learn electronics.
Circuit principle:
When the power supply is switched on, two triodes must compete for the pilot, but due to the differences in components, only a certain pipe pilot. If Q1 is on, then Q1 collector voltage drops, D1 is lit, and the left end of capacitor C1 is close to zero voltage. Since the voltage at both ends of capacitor cannot change suddenly, Q2 base is also pulled to nearly zero voltage, so that Q2 is cut off and D2 is not bright. As the power supply charges C1 through the resistor R2, the base voltage of the transistor Q2 gradually increases. When the voltage exceeds 0.6V, Q2 changes from the cut-off state to the conduction state, the collector voltage drops, and D2 is lit. At the same time, the decrease of collector voltage of transistor Q2 makes the base voltage of transistor Q1 jump down through the action of capacitor C2, Q1 changes from conduction to cut-off, and D1 goes out. In this way, two transistors in the circuit will take turns to conduct and stop, and two light-emitting diodes on the cycle of light. Changing the capacity of the capacitor can change the speed of the LED cycle.
This product was added to our catalog on Monday 18 September, 2023.
