Recent Posts Tagged With 'test-measurement'

• LED Power Meter Using Digital Multimeter

  Posted on Friday September 18th, 2009 at 18:44 in test circuit, rf circuit, led circuit, test-measurement

  LED power Meter circuit is a simple RF detector using diodes to charge a capacitor. The voltage developed across the capacitor is indicated by a multimeter set to a low voltage range. The circuit is soldered together without the need for a PC board,...

• Analog Milliamp Meter Used as Volt Meter

  Posted on Monday September 7th, 2009 at 23:33 in test circuit, test-measurement, meter circuit

  By adding a series resistance, a milliamp meter can be used as a volt meter. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10...

• Digital Blood Pressure Meter

  Posted on Sunday September 6th, 2009 at 03:35 in digital circuit, detector circuit, test circuit, test-measurement

  This Digital Circuit describes a Digital Blood Pressure Meter concept which uses an integrated pressure sensor, analog signal-conditioning circuitry, microcontroller hardware/software and a liquid crystal display. The sensing system reads the cuff pr...

• Electronic Thermometer Circuit

  Posted on Sunday July 12th, 2009 at 09:34 in test-measurement

  There are plenty of digital thermometers with ·1ºC displays but the accuracy is about + – 1ºC and you can not calibrate them. I made this thermometer circuit from components that were available at the local electronics hobby shop and it was an e...

• Measuring Milliohms with a Multimeter

  Posted on Sunday July 12th, 2009 at 09:05 in test-measurement

  Measuring low values of resistance is not easy. Low cost multimeters do not include a milliohm measurement range and specialist equipment is expensive. The simple circuit described here allows milliohm measurements to be made safely on a standard mul...

• Transistor Tester Circuit

  Posted on Thursday June 25th, 2009 at 19:47 in test-measurement

  Transistor tester is a very simple circuit that can b e used to check the hfe of transistors. Both PNP and NPN transistors can be checked using this circuit. Hfe as high as 1000 can be measured by using this circuit. The circuit is based on two const...

• RF Power Meter 0-500MHz

  Posted on Thursday June 25th, 2009 at 10:29 in test-measurement

  RF Measurement has been an expensive work so far the cost of measuring instruments are concerned. RF Meter is based on PIC16F876 microcontroller, AD8307 and 2x20 LCD display. Frequency range measurement is 0-500 MHz and Full documentation is included...

• Basic Multimeter Circuit

  Posted on Thursday June 25th, 2009 at 10:09 in test-measurement

  A number of shunts and multipliers selected by a switch can be used in association with a single basic meter to form a multirange instrument, known as a multimeter. this is capable of measuring volts, current and resistance. A multirange meter can b...

• Time Domain Reflectometer (TDR)

  Posted on Thursday June 25th, 2009 at 08:46 in test-measurement

  This Time Domain Reflectometer (TDR) based on circuit idea published in Electronics Design October 1, 1998 magazine. Time Domain Reflectometer modified version by Tomi Engdahl which you see in this document. The circuit has been tested with wide vari...

• Cable Reflection Tester-Reflectometer

  Posted on Thursday June 25th, 2009 at 08:25 in test-measurement

  A Time Domain Reflectometer (TDR) is a test set used to characterize and locate faults in metallic cables. It transmits a short rise time pulse along the cable pair. If the cable pair is of a uniform admittance and properly terminated, the entire tra...