Multistage preamp

221

04:34:34

Input sensitivity of a few uV and output of a few volts. Bandwidth 20Hz-300Khz so its well in the AM radio frequency range and its viable for use. Yeah it will be simpler to make a regenerative amp but this will also work even well (provided very low noise transistors are being used like bc550).  Just use a well shielded casing and well grounded leads and you should be fine. In its current form you'll be able to pick all the AM frequencies at once (been there done that) so you'll definitely need a tuning circuit. A detector stage might not be needed because every preamp stage here will also act as a demodulator. So just a tuning circuit will be needed

published 12 years ago

Sine_eyed

12 years ago

The way the transistors are set up- I keep setting this format in many sound amplification circuits. I even put together a little sound to light kit that uses this. I've noticed that component values can vary greatly- what's the math on it? I sure could use the formula(s) cuz i'm trying to modify that kit for more voltage and a few other things. Any info helps guys, thanks!..

thebugger

12 years ago

This is explicitly for radio amplification. At the input there is a few uV and an usual audio source gives 300-500mV. You'll be overloading it surely

jason9

10 years ago

What makes the upper frequency limits?

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