TL081A amplifier equivalent, general purpose j-fet single operational amplifier.
(0.5Hz) SQUARE WAVE OSCILLATOR R F = 1 0 0k Ω 3.3 k Ω - +15V T L0 81 1k Ω C = 3.3 F µF -15V 3.3k Ω 9.1k Ω f .
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