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A/D-D/A Converter Circuit

Index 20

POWER_VOLTAGE_TO_CURRENT_CONVERTER

Published:2009/6/25 2:17:00 Author:May

POWER_VOLTAGE_TO_CURRENT_CONVERTER
Low cost converter is capable of supplying constant ac currents up to 1 A over variable loads. (View)

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CALCULATOR_TO_STOPWATCH_CONVERTER

Published:2009/6/25 2:17:00 Author:May

CALCULATOR_TO_STOPWATCH_CONVERTER
This circuit can be fitted to any calculator existing with an automatic constant to enable it to be used as a stop-watch. The 555 timer is set to run at a suitable frequency and connected to the existing calculator battery via the push-on push-off switch and the existing calculator on-off switch. (View)

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HI_LO_RESISTANCE_TO_VOLTAGE_CONVERTER

Published:2009/6/25 2:10:00 Author:May

HI_LO_RESISTANCE_TO_VOLTAGE_CONVERTER
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LOW_COST，μP_INTERFACED，TEMPERATURE_TO_DIGITAL_CONVERTER

Published:2009/6/25 2:09:00 Author:May

LOW_COST，μP_INTERFACED，TEMPERATURE_TO_DIGITAL_CONVERTER
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IMPEDANCE_CONVERTER

Published:2009/6/24 23:42:00 Author:May

IMPEDANCE_CONVERTER
Used to match 10-megohrninputimpedanceto 50-ohm transmission Iine or 50-ohm input of instruments such as spectrum analyzer, video amplifier, or fre-quency counter. Voltage gain is exactly 0.5. Fre-quency response is from DC to 20 MHz and can be boosted by using higher-frequency transis-tor.-M. J. Salvati, FET Probe Drives 50-Ohm Load, EDN Magazine, March 5, 1973, p 87 and 89. (View)

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WINDSHIELD_WIPER_CONTROLLER

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

WINDSHIELD_WIPER_CONTROLLER
This circuit provides complete speed con-trol over car's windshield wipers. They can be slowed down to any rate even down to four sweeps per minute. The controller has two principal circuits: The rate-determining circuit-a unijunction transistor connected as a freerunning oscillator, and the silicon-controlled rectifier which is the actuator. (View)

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NTSC_TO_RGB_CONVERTER

Published:2009/6/24 21:43:00 Author:May

NTSC_TO_RGB_CONVERTER
This circuit takes baseband NTSC video, decodes it, and derives RGB video suitable for driving a color multisync computer monitor. This enables the user to take advantage of the generally better resolution of computer monitors. (View)

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TEMPERATURE_TO_FREQUENCY_CONVERTER_CELSIUS

Published:2009/6/24 4:17:00 Author:May

TEMPERATURE_TO_FREQUENCY_CONVERTER_CELSIUS
The 1.00-V reference output can be combined with the 1-mV/°K output to realize various temperature scales. For the Celsius scale, the lower end of the timing resistor must be offset by 273 mV. This is easily accomplished, and it results in an output from 0 to 1 kHz for temperatures from 0℃ to +100℃. Other offsets and scale factors are equally easy to implement. (View)

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TEMPERATURE_TO_FREQUENCY_CONVERTER_KELVIN

Published:2009/6/24 4:17:00 Author:Jessie

TEMPERATURE_TO_FREQUENCY_CONVERTER_KELVIN
This simple connection results in a direct conversion of temperature to frequency. The 1-mV/°K temperature output serves as the input to the buffer amplifier, and the oscillator drive current is scaled to be 298μA at 298°K (+25℃). Use of a 1000-pF capacitor results in a corresponding fre-quency of 2.98 kHz. A single-point trim for calibration is normally sufficient to give errors less than ±2℃ from -55℃ to +125℃. An NPO capacitor is preferred to minimize nonlinearity that results from capacitance drift. (View)

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EIGHT_INPUT_A_D_CONVERTER_FOR_TEMPERATURE_MEASUREMENTS

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

EIGHT_INPUT_A_D_CONVERTER_FOR_TEMPERATURE_MEASUREMENTS

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)