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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Variable Gain Amplifier Circuits

Dave's Amplifier Circuits:      Audio       Buffers         High Frequency-HighSpeed-Wide Band       
High Impedance Circuits      Low Noise      RF (Radio Frequency)       
Transimpedance    Variable Gain     Current to Voltage Converter

0VAC to 280VAC Variable Isolated AC Voltage  -  I designed and built this circuit about 25 years ago. It came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC. It provides complete isolation from the power line. It uses two 1:1 isolation transformers that are wired in parallel . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/08/00]

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Variable Gain Amp Circuits

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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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