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200mA 12V Op Current Gain Stage (Current Booster) Circuit Design
An output booster is needed when you want to achieve the needed current/voltage gain. Great output commonly need in accociation with the the output power limitation of mostly IC processing. The following figure shows you circuit diagram of the typical current gain stage if you want to design a booster stages which achieve power gain while maintaining good dynamic performance.
The design of circuit above will boost the LF356 inverter amplifier’s output current to a 200 mA while maintaining full 12V output swing. The resistors (200 Ohm) and diodes (D1-D4) associated with LM334 give temperature compensation. 20 Ohm resistor will set the 3.5mA current value. D5-D6 provide output short circuit protection by shunting drive from Q1-Q2 if output current exceeds about 275mA.
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