Electrical Equipment Circuit

HEART_STIMULATING_PULSE_OUTPUT_STAGE

Published:2009/7/20 20:42:00 Author:Jessie

Used in conjunction with pulse amplifier to increase stimulating voltage when scar tissue develops under electrodes sewn to auricle and ventricle of heart, introducing excessive load resistance. Produces constant-voltage positive-going pulse having maxi-mum amplitude of 15 V and0.1-sec duration, when triggered by positive pulse.-G. F. Vanderschmidt, Two-Transistor Amplifier Corrects Heart Block, Electronics, 31:47, p 80-81.   (View)

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EEG_WAVEFORM_ANALYZER

Published:2009/7/20 20:40:00 Author:Jessie

Uses derivative curves of primary eeg signals to quantitatively describe waveshape deviations of irregular electrical waveforms emitted by brain, in terms of time and amplitude. Oporates on zero-crossing detector measurements to produce analog voltages proportional to time between base periods and also proportional to time values of left and right deviation coefficients.-C. J. Zaander, Computer Ancalyzes Brain Waveforms, Electronics, 31:29, p 68-72.   (View)

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Anbaolu microwave safe control board circuit diagram

Published:2011/8/2 2:23:00 Author:Rebekka | Keyword: Anbaolu, microwave safe control board

Here is the diagram of anpo road microwave safe control board circuit.   (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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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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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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SLIDING_GATE_FOR_HEART_SOUNDS

Published:2009/7/20 21:05:00 Author:Jessie

Two multivibrators, synchronized with time reference,permit listening to selected portions of heart sound. Potentiometers permit adjusting width and position of gate.-R. Weiss, Heart-Sound Discriminator Simplifies Medical Diagnosis, Electronics, 34;24, p 52-55.   (View)

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ARTIFICIAL_LARYNX

Published:2009/7/20 21:04:00 Author:Jessie

Output is negative pulse whose repetition frequency is varied from 100 to 200 cps by rheostat to change pitch of voice while speaking. Modified telephone receiver serves as vibrator that is pressed against throat to transform generated vibrations into speech sounds by normalmal use of throat cavity, tongue, mouth, teeth, and lips. With practice, users can achieve sentence intelligibility above 97%.-Circuit Substitutes as Larynx, Electronics, 32:27, p 60-63.   (View)

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L_I_N_E_A_R_TRANSISTORIZED_HORIZONTAL_SWEEP

Published:2009/7/20 21:03:00 Author:Jessie

Placing transformer in yoke circuit provides better thon 0.5% linearity for deflecting 16.inch crt having 52° defection angle and 15-kv accelercation voltage. Line rate is 28.35 kc with 945 lines; Supply voltage determines width or amplitude of sweep. C can be increased to get 525-line rate.-J. W. Greininger, Improving Lineority in Transistorized Horizontal Sweeps, EEE, 12:9, p 61-62.   (View)

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PLETHYSMOGRAPH

Published:2009/7/20 20:57:00 Author:Jessie

Transistorized unit measures change in impedance of living tissue resulting from nonrythmic fluctuations of blood content Changes of 0.1％ in total tissue impedance are detected by resistance bridge and phase-sensitive detector that scans bridge unbalance.-S. Bagno and F. M.Liebman, Impedance Measurements of Living Tissue, Electronics, 32:15, p 62-63.   (View)

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CONDUCTIVITY_METER

Published:2009/7/20 20:57:00 Author:Jessie

Circuit using single quad opamp measures relative change in con-centration of salt solution by monitoring its conductance. Use of alternating current through solution eliminates errors caused by electrolysis effect. Wien-bridge oscillator having R4C1 and R4R3 as arms of bridge generates 1-kHz signal for driving amplifier A2 through solution. P1 controls oscillator amplitude, and P2 adjusts gain of A2. A3-A4 form precision rectifier giving output voltage equal to absolute value of input voltage.-M. Ahmon, One-Chip Conductivity Meter Monitors Salt Concentration, Electronics, Sept. 15, 1978, p 132-133.   (View)

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Percent_of_deviation_ratio_computer

Published:2009/7/21 2:09:00 Author:Jessie

Percent of deviation ratio computer (courtesy Analog Devices, Inc.).   (View)

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Fuda Brand ZL130-81 Dry And Wet Vacuum Cleaner Circuit

Published:2011/8/2 22:05:00 Author:Robert | Keyword: Fuda, Dry, Wet, Vacuum Cleaner

The picture shows the Fuda Brand ZL130-81 dry and wet vacuum cleaner circuit. The XP is power plug. The S is power switch. The FU is fuse. The T is power transformer. The K1 is relay. The K1-1 is relay K1's normally openning contactor. The IC is integrated circuit. The VT is triode. The SP is air pressure sensor. The XT is terminal board. The M is motor. The VD1, VD2are indication lamps.   (View)

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Latch_circuit_using_an_LM3909_chip

Published:2009/7/21 2:39:00 Author:Jessie

Latch circuit using an LM3909 chip. Circuitry inside dashed lines is the LM3909, The circuit switches to and holds its condition whenever the switch changes sides (courtesy National Semiconductor Corporation).   (View)

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Driving Circuit Transformer Primary And Secondary Circuit

Published:2011/8/3 10:18:00 Author:Robert | Keyword: Driving, Transformer, Primary, Scondary

The picture shows the IGBT switch tube's driving circuit transformer primary and secondary principle circuit. The R235-R238 are grid electrode series resistance. It is important for IGBT grid electrode driving by selecting adequate grid electrode series resistors.Its openning and closing are achieved by the grid electrode circuit's charging and discharging. The grid electrode resistor with low value would make the grid electrode capacitot's charging and discharging be fast. So it would reduce the switching time and switching power consumption. When it has short circuits or it is during the closing time of fly-wheel diode which has bridge connection to the crossing IGBT, the added du/dt on the IGBT and its collector polar's a grid electrode capacitor could cause the case that there is current through the grid electrode circuit. If this current is large enough, this would generate voltage between grid electrode resistors and make the IGBT be wrong connected.   (View)

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NEON_LAMP_OSCILLATOR

Published:2009/7/21 3:02:00 Author:Jessie

The neon lamp has negative dynamic resistance-the voltage across it falls while conduction is increasing. As a result, it flashes on and off.The frequency depends on the time constant RC and the supply voltage, as well as lamp characteristics.   (View)

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Konka R878 mobile phone cable connection figure

Published:2011/8/3 1:21:00 Author:Ecco | Keyword: Konka , mobile phone , cable connection

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Konka R878 mobile phone cable connection schematic diagram

Published:2011/8/3 1:24:00 Author:Ecco | Keyword: Konka , mobile phone , cable connection

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