Signal Processing

VIDEO_LINE_RECEIVER

Published:2009/6/24 4:28:00 Author:Jessie

This circuit can achieve 46-dB common-mode rejection if R1, R2, R3, and R4 are matched to 1%. C1 is adjusted for best CMR above 1 MHz.   (View)

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THERMOCOUPLE_COLD_JUNCTION_COMPENSATION

Published:2009/6/24 4:27:00 Author:Jessie

A single-supply circuit is shown. R3 and R4 divide down the 10-mV/°K output of the LM329B and its associated voltage divider provide a voltage to buck out the 0℃ output of the LM335. To calibrate, adjust R1 so that V1 = αT, where cc is the Seebeck coefficient and T is the ambient temperature in degrees Kelvin. Then, adjust R2 so that V1 - V2 is equal to the thermocouple output voltage at the known ambient temperature.   (View)

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SIMPLE_CRYSTAL_RADIO

Published:2009/6/24 4:27:00 Author:Jessie

An IN34A (D1) is used as a detector in this crystal radio. A good outdoor antenna should be used.   (View)

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TWO_BAND_RADIO

Published:2009/6/24 4:25:00 Author:Jessie

This TRF receiver covers the AM broadcast band and longwave bands (used in Europe and Asia for broadcasting). A loop antenna is used for reception and an extemal antenna can be connected.Frequency coverage is 150 to 1600 kHz.   (View)

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ONE_TUBE_REGENERATIVE_AM_RECEIVER

Published:2009/6/24 4:24:00 Author:Jessie

Suitable for AM reception and as a simple radio project, this circuit uses a single tube as a regenerative detector.   (View)

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AF_POWER_OSCILLATOR

Published:2009/6/24 4:15:00 Author:May

An LM386 audio power IC is set up as a feedback oscillator. Any supply from 6 to 12 V can be used. The circuit can drive a loudspeaker.   (View)

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SIMPLE_RF_TEST_OSCILLATOR

Published:2009/6/24 4:13:00 Author:May

A simple oscillator for IF alignment (455 kHz) can prove useful in field testing or where a stan-dard signal generator is available. L1 should res-onate at the desired output frequency with the series combination of C2 and C3.   (View)

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MOSFET_MXER_OSCILLATOR_CIRCUIT_FOR_AM_RECEIVERS

Published:2009/6/24 4:10:00 Author:May

This circuit is an improved front end for upgrading a transistor AM receiver. This front end is useful when the radio is to be used as a tuneable IF amplifier with shortwave converters.   (View)

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COLPITTS_OSCILLATOR

Published:2009/6/24 4:07:00 Author:May

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LC_AUDIO_OSCILLATOR

Published:2009/6/24 4:06:00 Author:May

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NE602_LOCAL_OSCILLATOR_CIRCUITS

Published:2009/6/24 4:05:00 Author:May

Local oscillator circuits for the NE602.   (View)

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TWO_WIER_REMOTE_TEMPERATURE_SENSOR_WITH_SENSOR_GROUNDED

Published:2009/6/24 4:13:00 Author:Jessie

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EIGHT_INPUT_A_D_CONVERTER_FOR_TEMPERATURE_MEASUREMENTS

Published:2009/6/24 4:03:00 Author:Jessie

The actual processing circuitry of this A/D converter consists of only four parts: U2, U3, R1 and R2. Eight temperature probes are used with the circuit; however, they can be replaced with other types of sensors, as long as resistors R3 through R10 are removed.   (View)

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AM_FM_RECEIVER_CIRCUIT

Published:2009/6/24 3:48:00 Author:Jessie

This circuit shows the LM1868 as a complete AM radio and FM IF section. An extemal FM front end is used for the 88- to 108-MHz band. Audio output is 0.5 W and either 9-V battery or line operated supply can be used.   (View)

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SHORTWAVE_RECEIVER

Published:2009/6/24 3:45:00 Author:Jessie

This receiver covers 8.5 to 11.5 MHz in two bands and has a sensitivity of under 1 μV. Nn NE602 mixer feeds a 455-kHz IF amplifier (Q1 and Q2), detector D4, and audio amplifier IC2. Q4 serves as an AGC amplifier coil data is given in the table. The LO is varactor tuned.   (View)

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ac／dc_VACUUM_TUBE_AM_AND_SHORTWAVE_RECEIVER

Published:2009/6/24 3:38:00 Author:Jessie

This circuit was used in a World War II vintage AM／SW（6 to 18 MHz）recelver and shows typical circuits used in recelvers at that time.   (View)

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26_GHz_OSCILLATOR_FOR_RADAR_SPEED_GUN

Published:2009/6/24 3:19:00 Author:May

This circuit consists of 2.6-GHz oscillator Q2, a coupling rrticrostripline to ANT1, a 1.1 1/4 wave probe, detector D2, and audio amp Q1. The oscillator feeds power to the antenna, which radiates the signal. The reflected signal from a moving target mixes with the oscillator signal in D2. The resultant beat note (doppler shift) is amplified by Q1 and fed to jack J1, which is used to feed the circuit 12 Vdc.   (View)

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STEPPER_MOTOR_PULSE_GENERATOR

Published:2009/6/24 2:59:00 Author:May

When the switch is in its normally closed (NC) position, capacitors C1 and C2 are held discharged by diodes Dl and D2. Switching off transistor Q1 inhibits the voltage-controlled oscillator of the PLL. The two inputs and, hence, the output of the EX-OR gate (phase comparator 1) ofthe PLL remain at the logic 0 level.When the pushbutton is pressed, C1 and C2 are allowed to charge via resistors R1 and R2. The VCO is enabled only after a time delay (≈0.5 second) set by R1, R3, and C1. During this delay period, the EX-OR gate output follows the logic level at the switch output. As a result, one-shot pulses can be generated by pressing the pushbutton, then releasing it within 0.5 second. R5 provides the switch-debouncing function.If the pushbutton is pressed for more than 0.5 second, the VCO is enabled. The rising voltage at the control input (pin 9) causes a linear increase in VCO frequency and thus accelerates the step-per motor. Releasing the pushbutton discharges C1 and C2 and inhibits the VCO.   (View)

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UP_DOWN_STAIRCASE_WAVE_GENERATOR

Published:2009/6/24 2:56:00 Author:May

This staircase waveform first steps up and then steps down by the circuit shown. An input pulse generator provides the pulses that cause the output to step up or down, depending on the conduc-tion of the clamp transistor, Q1. When this is ON, the down current pulse is diverted to ground and the staircase then steps up. When the upper voltage trip point of Amp 2 is reached, Q1 goes OFF and as a result of the smaller down input resistor (one-half the value of the up resistor, R1), the staircase steps down to the low-voltage trip point of Amp 2. The output voltage, therefore, steps up and down between the trip voltages of the Schmitt Trigger.   (View)

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WIEN_BRIDGE_SINE_WAVE_OSCILLATOR_1

Published:2009/6/24 2:56:00 Author:May

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