Tag Archives: 741

Stereo balance meter

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The simplest stereo balance meter circuit schematic available on the internet! When Left and Right signals are equal, no output is present from U1 and pin 6 is at a steady 4.5V. Unbalanced audio causes the LEDs to vary in brightness, which causes a difference that corresponds to unbalanced between… Read more »

Noise reduction circuit

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The noise reduction circuit is based on the observation that noise is always disturbing in intervals when music stops. It will attenuate the signal output by about 45 dB, when the musical signal input is null or very weak. If the musical signal begins to increase, the attenuation will decrease… Read more »

Charger battery Lithium Variable current up to 2A by L200

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This is circuit Charger battery Lithium Variable current up to 2A by IC L200. I’ve always wanted a fully adjustable current DIY lipo charger (and recently higher output). The L200 datasheet has an LM741 op amp design to achieve this. It works well but has a very non-linear action (worse… Read more »