C1 power amplifier input straight capacitor (block the input DC voltage, to avoid the DC input power amplifier caused by the working point offset), C2 power amplifier input (R1R2 and C1 constitute 1\/2 power supply bias) biased filter capacitor (for dual power supply power amplifier, when single power supply is used, the input must be biased 1\/2 of the power supply voltage. Ensure dynamic maximum output)
The feedback divider capacitor of C3 power amplifier, and the DC offset voltage of the output port will be 100% fed into the negative feedback side of the power amplifier to ensure that the power amplifier can preserve the DC balance.
C4 output capacitor, because it is a single power supply operation, this amplifier is equivalent to the OTL (transformerless output) amplifier, must have a straight capacitor, this capacitor is also equivalent to the AC negative power supply, to provide AC negative half cycle current to the load.
C5 and R6 form an absorption network, such as the Bell network, which absorbs the peak of the inductive load and avoids the resulting self-excitation of the amplifier
The role of the capacitor in this circuit is to charge and discharge, charge and discharge time corresponding to the LED flashing time, the larger the capacitor value, the longer the charge and discharge time, the LED on and off time also increases, c1, c2 can also use different values to achieve the LED not the same on and off time requirements.
Changing resistance values has the same effect as changing capacitance values!