Low Gain Low Distortion Amplifier

146

01:37:53

This amplifier uses a bootstrap which not only increases the gain (from something quite low to 24.8dB (17.3V/V)), but seems to also either not affect or even decrease the distortion. Two of these in series will produce a gain of 49.6dB (300V/V) while still keeping a low distortion. Much lower than my previous amplifier (Small Signal Amplifier).

published 7 years ago

eekee

7 years ago

I decoupled the output with a 100μF cap and gave it a 10kΩ load. Gain dropped to approx. 15.5V/V and it developed some asymmetry. Decoupled output settled at min. -1.57, max. 1.54V.

eekee

7 years ago

(Load to ground, not differential.) With a 50kΩ load it settles at min -1.7V, max 1.66V, which averages 16.8V/V. It's a high-impedance source! :)

jason9

7 years ago

You could add a current amplifying stage to get around it’s high impedance.

eekee

7 years ago

Ah yes, a common collector Darlington pair does the job nicely.

eekee

7 years ago

I have to admit a certain curiosity as to how it compares to my FETlington pair: http://everycircuit.com/circuit/5212126766694400

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