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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
I have also seen an "incremental gain" circuit using an op-amp with arrays of resistors and diodes in the feedback circuit used for low distortion sinewave shaping.
The circuit generates a piecewise linear approximation of the sine function between -90 degrees and +90 degrees from a triangle wave input.
If the diodes switched abruptly the output waveform would consist of linear segments, but in practice the soft turn-on of the diodes smoothes out the curve.
This page shows the general idea:
...although not the exact circuit I was thinking of.
EDIT: Page 7 in this document about ways to generate sinewaves is what I was thinking of...
Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
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Posts: 105
Steve McConner wrote ...
Transistor? What's that? I googled it for hours, but I can't find any information.
oops i used a dutch wordt for it :S it somthing like a mosfet but current driven not voltage. or is just voltage driven not current, XD can't remember i thought a mosfet was voltage driven.
Registered Member #1819
Joined: Thu Nov 20 2008, 04:05PM
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Posts: 137
R v.d. Tuuk wrote ... oops i used a dutch wordt for it :S it somthing like a mosfet but current driven not voltage. or is just voltage driven not current, XD can't remember i thought a mosfet was voltage driven.
Transistors are current driven, like you thought; a current on the base controls the current through the collector to the emitter. MOSFETs are voltage driven.
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ne555 sine wave ?
