![]() ![]() Output from the IC1B is connected to the Q1 transistor base terminal and LEDs are connected at the Emitter terminal of Q1. The transistor Q1 BC547 is used to drive the load (LED or lamp). Resistors R3 and R5 act as feedback Resistors for individual operational amplifiers. The output of the IC1A operational amplifier is connected with the IC1B operational amplifier Inverting pin through timing Resistor R4, the timing components are C1 and R4 by changing the value of these two components we can get different frequency level output. C1 timing Capacitor connected as feedback to IC1B operational amplifier.
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