Driver Transistor Amplifier. And q3 is a power amplifier out of the speaker. To more power to drive the q3 runs well.
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The rotary switch on the supply is designed for just this purpose. Analog devices driver amplifiers are available in a wide range of medium power general purpose amplifiers covering the frequency range from 400 mhz if to rf microwave and w band 86 ghz. These driver amplifiers include output powers from 15 dbm up to approximately 1 watt while covering various frequencies bandwidths and gain levels.
These products support frequencies up to 46 ghz using process technologies such as ingap hbt power phemt e d phemt and gan.
Be very careful that you keep the current and voltage within the device ratings. Be very careful that you keep the current and voltage within the device ratings. Analog devices driver amplifiers are available in a wide range of medium power general purpose amplifiers covering the frequency range from 400 mhz if to rf microwave and w band 86 ghz. Its function is a driver amplifier to boost up a signal from the preamplifier section.
