Pt100 RTD Current Loop Transmitter Using XTR105

XTR105 is a 4-20mA current loop transmitter integrated circuit, with two precision current sources. The Instrumentation amplifier gain inside this chip can be configured for a wide range of temperature or pressure measurements. This integrated circuit chip provides current excitation for platinum RTD temperature sensors and bridges, instrumentation amplifiers, and current output circuitry on a single integrated circuit. Two matched […]

Read more

RCV420: Single Chip Precision 4-20mA Current Loop Receiver

RCV420 is a special function integrated circuit chip for 4-20mA current loop receiver. RCV420 provide complete 4-20mA to 0-5V conversion, with 0.1% overall accuracy, 86dB CMR, and ±40V common-mode input range. This IC chip is suitable for many applications: PROCESS CONTROL INDUSTRIAL CONTROL FACTORY AUTOMATION DATA ACQUISITION SCADA RTUs ESD MACHINE MONITORING Here is the schematic diagram of the basic […]

Read more

Audio Power Meter: Shows Your Audio Amplifier’s Actual Output Power

Using this circuit, you can measure the actual output power of your amplifier.  You can put this circuit in a box as a measurement instrument, or you can integrate it inside your power amplifier to get real power display. The circuit’s schematic diagram is shown in the figure below. This  circuit would be a handy instrument for audio engineer, for […]

Read more

Audio Frequency Meter Using 555 IC

This audio frequency meter uses 555 IC as a monostable multivibrator (one-shoot trigger). A monostable multivibrator can act as a frequency-to-voltage converter because it produce a fixed pulse width, with the repetition rate/density is proportional to the triggering input frequency. Here is the circuit’s schematic diagram: For resistor R1, because it set the measurement range, it’s better to use a […]

Read more

Voltage-Current(V/I) Curve Tracer

Voltage-Current curve tracer is very important tools for components ant circuits troubleshooting. This circuit need an oscilloscope with X-Y inputs to display the curve. This circuit provide adjustment for both peak-to-peak voltage and the current limiter. The peak-to-peak voltage selected using different voltage taps of the transformer, and the current limiter is selected by different series resistor. An optional diode […]

Read more

Current Loop Transmitter For Temperature Sensor

Current loop interface has been widely used in industrial environment because it’s robustness. Noise resistance and fail detection capability  made it suitable for long distant transmission in harsh environment. This circuit provide current loop transmitter for temperature sensor. Here is the circuit’s schematic diagram: The temperature measurement is done by LM35 temperature sensor chip. You can use general silicone diode […]

Read more

Temperature-to-Frequency Converter: Enabling Simple Telemetry

If you send a DC voltage signal to carry the information for a long distance, then the signal will suffer attenuation  with unpredictable characteristic introduced by the medium, for example the cable resistance that vary with temperature changes. If you carry the information with frequency, not a DC voltage level, then the frequency will be stable even though it’s amplitude […]

Read more
1 16 17 18 19 20