Circuit Diagram

Voltage_controlled_oscillator_for_FM_operation_using_a_2N4416

Published:2009/7/20 23:37:00 Author:Jessie

Voltage-controlled oscillator for FM operation using a 2N4416 (courtesy Texas Instruments Incorporated).   (View)

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CASCADE_ANGLE_MODULATOR

Published:2009/7/20 23:36:00 Author:Jessie

Gives lwice the modulation index for a particular signal, or 50' for the two sections.-A. C. Todd, P.Schuck, and H. M. Sachs, Using Voltcrge-Var-iable Capodtors in Modukttor Design, Elec-tronics, 34;3, p 56-59.   (View)

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HIGH_FREQUENCY_OSCILLATOR

Published:2009/7/9 1:35:00 Author:May

Intended primarily as a building block for a QRP transmitter, this 20-MHz oscillator delivered a clean 6-V, pk-pk signal into a 100-Ω load.   (View)

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Stabilized_Wien_bridge_oscillator

Published:2009/7/20 23:36:00 Author:Jessie

Stabilized Wien bridge oscillator (courtesy Analog Devices, Inc.).   (View)

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Current three-phase motor phase-failure protection circuit diagram

Published:2011/8/2 2:39:00 Author:Rebekka | Keyword: Current three-phase motor, phase-failure protection

The production of transformer Tl ~ T3 can use the ring ferrite core which is easy to be purchased on the market. It uses Φ0.25mm high-strength wire wound with 150 to 250 turns. The number of the turns is determined by the motor power. If the motor power is low, you can wound more turns. The power supply line passes the ring. The capacitors C1 ~ C3 use the 10μF/25V electrolytic capacitors. C4 uses 0.1μF/63V ceramic chip capacitor; C6 uses 470μF/25V electrolytic capacitor; C5 is the interference absorption capacitor, when the action is too sensitive, it can increase the capacitance value of C5, conversely it will reduce the value of C5, its range is 4.7 ~ 33μF/25V. Resistors Rl = R2 = l.2kΩ, R4 = 390kΩ, R5 = 680kΩ, R6 = 15kΩ, R7 = 2kΩ, the nominal power resistor is 1/8W RJ. Zener VD11's regulator value is about 8V. Other diodes use 1N4004.   (View)

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DELTA_SIGMA_MODULATION_FOR_DIGITALCOMMUNICATIONS

Published:2009/7/20 23:35:00 Author:Jessie

Flip-flop sampling pulse generator supplies 5-mlcrosec pulses at 3-kcprr to modulator that also has analog signal input. Integrated difference signal fires Schmitt trigger to provide positive output that opens gate, passing square-wave pulse that sets flip-flop. Output of flip-flop is fed to emitter-follower and demodulated by ac five low-pass liter having 50-cps cutoff.-H. Inose et al, New Modulation Technique Simplifies Circuits, Electronics, 36:4, p 52-55.   (View)

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75_Ω_VIDEO_PULSE_AMPLIFIER

Published:2009/7/9 1:35:00 Author:May

HA-5190 can drive the 75-Ω coaxial cable with signals up to 2.5 V pk-pk without the need for cur-rent boosting. In this circuit, the overall gain is approximately unity because of the impedance matching network.   (View)

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SLIDE_SHOW_TIMER

Published:2009/7/9 1:34:00 Author:May

You can set the interval from about 5-30 seconds. A relay operates the slide-change mechanism. Op amp U1 forms a sort of Schmitt trigger. Resistors R1 and R2 bias the noninverting input at pin 3 of U1 to half the supply voltage. Feedback resistor R3 increases or reduces the bias to pin 3, depending on whether the output of U1 is high or low.When power is first applied to the circuit, C2 has a zero charge and the inverting input of the op amp is at a lower voltage than its noninverting input. When the output of U1 is high, C2 begins to charge through R5 and D1. It takes about one second for the charge on C2 to reach the same voltage as that at the noninverting input of U1. At that time, the output of U1 begins a negative swing.Because of the positive feedback through R3, the voltage at the noninverting input is reduced and the output becomes more negative. The voltage at the noninverting input is about 1/4 of the supply voltage, and C2 begins to discharge through the resistor bank. The timing is controlled by R6.The resulting pulses are fed to the base of Q1, configured as an emitter-following buffer stage, which is used to activate relay K1. Transistor Q1 is necessary because op amps usually have an output current in the 20-mA range, which is too low to activate the relay.   (View)

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First_and_second_mixer_stages_for_a_27_MHz_CB_receiver

Published:2009/7/20 23:34:00 Author:Jessie

First and second mixer stages for a 27 MHz CB receiver. Note that these two stages replace three in conventional receivers not employing dual-gate MOSFETs (courtesy Texas Instruments Incorporated).   (View)

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Overtone_crystal_oscillator_with_operating_range_of_20_MHz_to_100_MHz_depending_on_crystal_selection_and_tank_tuning

Published:2009/7/20 23:32:00 Author:Jessie

Overtone crystal oscillator with operating range of 20 MHz to 100 MHz depending on crystal selection and tank tuning. VEE is -5.2 volts (courtesy Motorola Semiconductor Products Inc.).   (View)

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250_KW_PEAK_FROM_SCR

Published:2009/7/20 23:32:00 Author:Jessie

Line-type modulator uses silicon diodes for high-voltage rectifiers, backswing, holdoff, and inverse-diode circuits. Trigger generator uses two-layer and four-layer diodes to provide pulse burst repetition rates up to 25 kc.-H. G. Heard, Controlled Rectifier Produces Quarter-Mega watt Pulse Power, Electronics, 34:25, p 54-55.   (View)

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FOUR_RANGE_VTVM

Published:2009/7/20 23:31:00 Author:Jessie

Measures r-f power oscillator output, for establishing irradiation and calibration procedures and positioning techniques when using focused ultrasound for therapeutic treatment of deep-seated brain structures.-B. J. Cosman and T. F.Hueler, Instrumentation for Ultrasonic Neurosurgery, Electronics, 32:20, p 53-57.   (View)

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900_MHz_to_45_MHz_mixer_using_a_3N225_dual_gate_MOSFET

Published:2009/7/20 23:31:00 Author:Jessie

900 MHz to 45 MHz mixer using a 3N225 dual-gate MOSFET (courtesy Texas Instruments Incorporated).   (View)

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450_432_MHz_PF_amplifier_using_a_3N204_dual_gate_MOSFET

Published:2009/7/20 23:30:00 Author:Jessie

450/432 MHz PF amplifier using a 3N204 dual-gate MOSFET(courtesy TexasInstruments Incorporated)．   (View)

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Multicrystal_RF_oscillator_for_the_20_MHz_to_20_MHz_range

Published:2009/7/20 23:30:00 Author:Jessie

Multicrystal RF oscillator for the 2.0 MHz to 20 MHz range (courtesy Motorola Semiconductor Products Inc.).   (View)

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BATTERYLESS_CARDIAC_PACEMAKER

Published:2009/7/20 23:30:00 Author:Jessie

Body fluids are electrolyte for implanted silver and zinc electrodes that provide d-c power for four-transistor pacemaker. Secondary of T1 provides feedback for ringing-choke oscillator Q1, which charges C until Q2 is cut off. C then discharges until Q1 can again con duct.-O. Z. Roy and R. W. Wehnert, Keeping the Heart Alive with a Biological Battery, Electronics, 39:6, p 105-107.   (View)

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3_MC_COLPITTS_FOR_TONOMETER

Published:2009/7/20 23:29:00 Author:Jessie

Frequency shift is proportional to pressure on quartz crystal-D. E. Newell, C. H. Horn, and M. L. Rubin, Measuring Eyeball Pressure with a Crystal Oscillator, Electronics, 34:36, p 64-65.   (View)

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Fundamental_crystal_oscillator_for_1_MHz_to_20_MHz

Published:2009/7/20 23:28:00 Author:Jessie

Fundamental crystal oscillator for 1 MHz to 20 MHz. VEE is -5.2 volts (courtesy Motorola Semiconductor Products Inc.).   (View)

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PILL_TRACING_INTEGRATOR

Published:2009/7/20 23:28:00 Author:Jessie

Voltage proportional to speed of travel of pill-sized radio transmitter in human body is integrated in quantizing circuit that delivers number of pulses proportional to track length. Transistor differential amplifier charges C, and Schmitt trigger controls discharge of C through R2．Frequency of trigger pulses is proportional to input voltage within 1% over range of 2 to 200 mv，-B. Jacobson and B Lindberg, Servo Tracks Pill in Human Body,Electronics,36:12,p58-60.   (View)

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Voltage_controlled_oscillator_using_an_MC1648

Published:2009/7/20 23:18:00 Author:Jessie

Voltage-controlled oscillator using an MC1648. This VCO is tunable from 110 MHz to 145 MHz. The control voltage range is 1.8 volts at 110 MHz to 5 volts at 145 MHz (courtesy Motorola Semiconductor products Inc.).   (View)

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