• How to test a relay

    2016-01-19 19:42:3862

    This article shows you how to test a relay. A relay will usually have a coil, pole terminal and a set of contacts. The set of contacts that are open wh...

  • How to measure wind direction

    2016-01-19 19:29:59129

    I found this wind direction measurement circuit simple and interesting. If you are doing some home automation project, this might be another sensor tha...

  • How to build Infrared Remote Tester

    2016-01-19 16:42:4070

    Description A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked ...

  • How to build Oscilloscope testing module (huntron circuit)

    2016-01-19 16:22:5686

    Circuit diagram I call this the huntron circuit because a company by that name made a similar device. It is useful for trouble-shooting. I used it with...

  • Quartz crystal tester circuit

    2016-01-19 16:18:0263

    Description. This a very simple and inexpensive circuit that can be used to test quartz crystals.Here a Colpitts oscillator is wired used the transisto...

  • Multi-Tester Logic Probe Signal Tracer And Injector

    2016-01-19 16:08:3580

    This circuit for a test set contains a signal injector (U1A/U1B) and associated com ponents, a logic probe (U1C) and an audio amplifier. SI selects eit...

  • Latest Stunning Pictures of the Sun by NASA

    2016-01-19 15:12:0460

    On February 11th, 2010, NASA launched a new spacecraft called the Solar Dynamics Observatory [SDO], which was designed to give more knowledge and clear...

  • Continuity Tester Circuit for your sound

    2016-01-19 14:02:4361

    Continuity Tester Circuit Welcome back to Free circuit dot com ,Today we would like to present you with sound tester circuit . Regarding description wi...

  • Fastest Finger First Indicator(FND507)

    2016-01-19 13:03:4470

    This article describes the Fastest Finger First Indicator (FND507). The principle is very simple, very practical. The circuit components can help you u...

  • How to build XTal Tester

    2016-01-19 13:03:3265

    Circuit diagram This is a simple XTal tester circuit. T1 and XTal have formed an oscillator. C1 and C2 are voltage divider for oscillator. if the XTal ...

  • Battery-Voltage Measuring Regulator

    2016-01-19 12:16:2265

    This circuit allows a microprocessor system to measure its own battery voltage. A Texas Instrument TI43 1 precision shunt regulator acts as a precision...

  • Measure the distance by bicycle CIRCUIT (BC549C)

    2016-01-19 12:01:5666

    This article describes a Measure the distance by bicycle CIRCUIT (BC549C). The content is very simple, very helpful. Components in this article can hel...

  • Battery-capacity-tester

    2016-01-19 10:32:2980

    The test circuit gives an indication of the capacity remaining in a battery. By noting the time in seconds that the LED remains on after you depress th...

  • Continuity Tester Circuit(BAT85)

    2016-01-19 10:06:5971

    This article describes the Continuity Tester Circuit (BAT85). The principle is very simple, very practical. The circuit components can help you underst...

  • Liquid-Crystal Display (LCD) Tester(CD4047)

    2016-01-19 09:35:33337

    This article describes the Liquid-Crystal Display (LCD) Tester (CD4047). The principle is very simple, very practical. The circuit components can help ...

  • 4 ? 20ma Current Loop Tester

    2016-01-19 07:16:34243

    This circuit injects an adjustable current through a wire loop. Using a digital current meter, the current can be adjusted from near zero to over 24 mi...

  • Improved Vibrating Battery Tester(LM393)

    2016-01-19 04:13:0465

    This article describes the Improved Vibrating Battery Tester (LM393). The principle is very simple, very practical. The circuit components can help you...

  • Diode tester

    2016-01-19 02:19:3968

    The circuit will display curves on a scope, contingent on the state of the diode. To ' 'calibrate,'' substitute a 1000-ohm resistor for the diode and a...

  • 12V battery capacity tester CIRCUIT (1N4003)

    2016-01-19 02:11:3867

    This article describes a 12V battery capacity tester CIRCUIT (1N4003). The principle is very simple, very practical. The circuit components can help yo...

  • Crystal Tester

    2016-01-19 01:56:1766

    A crystal tester circuit is very simple, it contains only oscillator and detector inside. This crystal tester circuit uses one transistor for the oscil...

  • Multi Wire Cable Tester

    2016-01-19 01:48:5268

    Description: A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity ...

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