Tag: lm741

DIY

DIY ECG with 1 op-amp

A DIY ECG made from single op-amp (LM741) and 5 resistors by Scott Harden: I made surprisingly good ECG from a single op-amp and 5 resistors! An ECG (electrocardiograph, sometimes called EKG) is a graph of the electrical potential your heart produces as it beats. Seven years ago I...

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Control

Light and Dark Sensitive Switch

Light / Dark Sensitive Switch project is a simple project which operates a relay when the light falling on the LDR goes below or goes above a set point. Input - 12 V @ 50 mA Relay output - SPDT relay 2-in-1 kit, either as light sensitive kit or dark sensitive switch Onboard...

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