Phase-sequence detector II

This circuit is designed to detect four-quadrant motion of a light source. By appropriately summing the signals from the X and Y axes, the resulting four-quadrant output can be utilized with an X-Y plotter, oscilloscope, or computer for simulation...

This circuit is designed to signal the exceeding of a fixed threshold in room noise through a flashing LED. Three fixed levels are selectable: 50, 70, and 85 dB. Two operational amplifiers provide the necessary gain for sounds captured...

This unit uses one TSAL6100 IR/LED emitter from Digi-Key. This IR diode has a narrow (10 degree) radiation pattern at 940 NM. It is driven via 2n2904 transistor for maximum current pulses. The detector is a Vishay TSOP4838 38Khz...

An NE602 functions as a heterodyne detector, while Q1 serves as a sense oscillator. When L1 is brought near metal, it induces a change in inductance, resulting in a shift in the resonant frequency of L1 and C6/C7. L1...

This metal detector circuit requires a power supply of 9 volts (DC) or a 9-volt battery. The circuit includes a variable capacitor C1 valued at 365 pF, a 100 pF silver mica capacitor C2, a 0.05 µF disc capacitor...

The detector circuit compares the output voltage of two separate voltage dividers with a fixed reference voltage. The resultant absolute error signal is amplified and converted to a logic signal that is TTL compatible. The described detector circuit serves as...