Circuit Diagram

CAR_BATTERY_MONITOR

Published:2009/6/24 21:52:00 Author:May

Waring light (LED) indicates when battery Voltage falls below level set by 10 K pot. Can indicate that battery is defective or needs charging if cranking drops battery vlotage belpw preset safe limit.   (View)

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BRIDGE_TRANSDUCER_AMPLIFIER

Published:2009/6/24 21:52:00 Author:May

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VIDEO_DRIVER_AMPLIFIER

Published:2009/6/24 21:52:00 Author:May

This simple circuit has a voltage gain of about 5x and will drive low-impedance loads (75 Ω) to 1.5 V p-p or better.   (View)

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4093_CMOS_VFO

Published:2009/6/24 21:52:00 Author:May

Two gates of a Quad 4093 are used in an astable multivibrator. C1 is a three-gang 365 pF variable capacitor with sections paralleled. S3 and S4 switch in optional extra capacitors.   (View)

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250_mA_60_MHz_CURRENT_FEEDBACK_AMPLIFIER_FOR_VIDEO_APPLICATIONS

Published:2009/6/24 21:51:00 Author:May

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BATTERY_POWERED_BUFFER_AMPLIFIER_FOR_STANDARD_CELL

Published:2009/6/24 21:51:00 Author:May

This circuit has negligible loading and disconnects the cell for low supply voltage or overload on output. The indicator diode extinguishes as disconnect circuitry is activated.   (View)

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TWISTED_PAIR_VIDEO_DRIVER_RECEIVER_CIRCUIT

Published:2009/6/24 21:51:00 Author:May

This circuit should be useful where a twisted-pair video line is to be used. R1 is adjusted for proper gain (monitor brightness and contrast) and C1 is adjusted for best color.   (View)

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ICE_WARNING_AND_LIGHTS_REMINDER

Published:2009/6/24 21:50:00 Author:May

This device will tell a driver if his lights should be on and will warn him if the outside temperature is nearing zero by lighting a LED and sounding a buzzer9 VR1 adjusts sensitivity for temperature, VR2 for light. Both thermistor and LDR should be well protected. Most high gain NPN transistors will work.   (View)

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CHOPPER_CHANNEL_AMPLIFIER

Published:2009/6/24 21:50:00 Author:May

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VIDEO_AMPLIFIER

Published:2009/6/24 21:50:00 Author:May

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SIMPLE_AUDIO_TEST_OSCILLATOR

Published:2009/6/24 21:50:00 Author:May

An 88-mH surplus telephone toroidal coil is used in a 1-kHz oscillator. Up to 8 V p-p into a high-Z load is available. THD is 0.9%.   (View)

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VIDEO_SUMMING_AMPLIFIER

Published:2009/6/24 21:50:00 Author:May

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ADJUSTABLE_VIDEO_CABLE_EQUALIZER

Published:2009/6/24 21:49:00 Author:May

The figure is a complete schematic of the cable equalizer. The LT1256 (U1) is a two-input/one-output 40-MHz current feedback amplifier with a linear control circuit that sets the amount that each input contributes to the output. One amplifier (input pins 13 and 14) of the LT1256 is configured as a gain of one with no frequency equalization. The other amplifier (input pins 1 and 2) has frequency equalizing components in parallel with the 12-kΩ gain resistor. An additional amplifier (U2, LT1227) is used to set the overall gain. Two amplifiers were used here to make setting the gain a single ad-justment, but in a production circuit, the LT1256 can be configured to have the necessary gain and the whole function can be done with one chip.   (View)

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LOW_SIGNAL_LEVEL，HIGH_IMPEDANCE_INSTRUMENTATION_AMPLIFIER

Published:2009/6/24 21:49:00 Author:May

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WINDSHIELD_WIPER_HESITATION_CONTROL_UNIT

Published:2009/6/24 21:49:00 Author:May

This circuit uses the 555 timer in the asta-ble or oscillatory mode. The length of time the timer is off is a function of the values of C1, R2, and R3. The potentiometer which controls the amount of hesitation . (Approximately 2 to 15 seconds.) R2 provides a minimum time delay when R3 is at its zero ohms position.   (View)

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1INSTRUMENTATION_AMPLIFIER

Published:2009/6/24 21:48:00 Author:May

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4093_CMOS_ASTABLE_OSCILLATOR

Published:2009/6/24 21:48:00 Author:May

Two gates of the Quad 4093 are used to make an oscillator. RX can be from about 5 kΩ to around 10 MΩ. CX can be from about 10 pF to many μF, the limit being set by the leakage of the capacitor. Frequency is approximately 2.8/RXCX (R MΩ, Cmfd).   (View)

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VIDEO_SWITCH

Published:2009/6/24 21:48:00 Author:May

Using National Semiconductor LH4266 and LH4006, this circuit switches one of two inputs to four output (75Ω) lines.   (View)

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VARIABLE_GAIN，DIFFERENTIAL_INPUT_INSTRUMENTATION_AMPLIFIER

Published:2009/6/24 21:48:00 Author:May

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SIMPLE_VIDEO_GRAY_SCALE_GENERATOR_EUROPEAN_LINE_STANDARD

Published:2009/6/24 21:47:00 Author:May

A simple gray-scale generator (staircase waveform) can be obtained with a CD4060 counter, a 1-MHz crystal oscillator, and several resistors to act as an elementary D/A converter to convert the binary count output to analog equivalent. This circuit is for European (PAL) standards.   (View)

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