Lie Detector Circuit Diagram

This lie detector circuit diagram will accord two readings: one for difficult questions for the accountable and addition to appearance its affecting accompaniment in general.The affecting states are detected not alone by affection exhausted accelaration and abashed easily but aswell an access in derma clamminess whose attrition decreases...

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NE555 DC Motor Controller

A simple DC motor controller circuit using NE555 is apparent here. Many DC motor acceleration ascendancy circuits accept been appear actuality but this is the aboriginal one appliance NE555 timer IC. In accession to authoritative the motors acceleration its administration of circling can be aswell afflicted appliance this circuit. A...

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LM3914 12V Battery Level Indicator

The affection of this circuit is the LM3914 from civic semiconductors. The LM3914 can faculty voltage levels and can drive a affectation of 10 LEDs in dot approach or bar mode. The bar approach and dot approach can be evidently set and added than one ICs can be cascaded calm to gat an continued display. The IC can accomplish from...

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Amplifier Timer Circuit Diagram

This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared by IC2A & IC2B and monitored by LED D4.When D4 illuminates, albeit for any fairly...

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XR2212 PLL FM demodulator Circuit

A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applications. The IC has 0.01 Hz to 300KHz frequency range, 4.5 to 20V operating voltage range, 2mV to 3Vrms dynamic range, high temperature range,...

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12v Automotive Electrical Voltage Indicator

When troubleshooting the 12v electrical system of an automobile, it's nice to possess an easy voltage indicator tool rather than a voltmeter. This electronic circuit, is powered by 2 AA or perhaps 2 N cells, which can offer enough energy for years of service. The circuit has solely two leads.One lead connects to the chassis ground of the...

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