Solderless DIY Multiple Hobby Project Kit Using 555 Timer & OP-Amp

Solderless DIY Multiple Hobby Project Board build around 555 Timer & OP-Amp, Bord provided with Male header connectors for easy solder less connections using Female Header wire jumpers. On board diode for reverse supply connections , Slide switch for ON/OFF Supply : 9V DC PP3 Battery Inputs :   Magnetic Filed Sensor, LDR Light Sensor. NTC Temperature Sensor, Tilt Mercury Switch,

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