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ADVANTAGES OF CLASS A PUSH PULL AMPLIFIER → Because of the absence of even harmonics in the output it gives more output per active devices for a given amount of distortion or less distortion for a given output per transistor. → Eliminates Non-linear Distortion, that may arise due to the curvature of transformer magnetization curve. → Lower ripple Voltage DISADVANTAGES OF CLASS A PUSH-PULL AMPLIFIER The drawbacks of push-pull amplifiers are:- → Requirement of two identical or matched transistors. → It need the use of driver stage to furnish two equal and opposite voltages at the input → It requires Bulky and expensive Transformers Back To HOME

The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations.A high level from the push button is coupled to the set line through a small (0.1uF) capacitor. The high level from the Q output is inverted by the upper transistor and supplies a low reset level to the reset line for about 400 mS, after which time the reset line returns to a high state and resets the flip flop. The lower flip flop section is configured for toggle operation and changes state on the rising edge of the clock line or at the same time as the upper flip flop moves to the set condition. The switch is debounced due to the short duration of the set signal relative to the long duration before the circuit is reset. CMOS Toggle Flip Flop Using Push Button Circuit Diagram  The Q or Qbar outputs will only supply about 2 mA of current, so a buffer transistor or power MOSFET...