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...
I found this wind direction measurement circuit simple and interesting. If you are doing some home automation project, this might be another sensor tha...
Description A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked ...
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...
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...
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...
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 Welcome back to Free circuit dot com ,Today we would like to present you with sound tester circuit . Regarding description wi...
This article describes the Fastest Finger First Indicator (FND507). The principle is very simple, very practical. The circuit components can help you u...
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 ...
This circuit allows a microprocessor system to measure its own battery voltage. A Texas Instrument TI43 1 precision shunt regulator acts as a precision...
This article describes a Measure the distance by bicycle CIRCUIT (BC549C). The content is very simple, very helpful. Components in this article can hel...
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...
This article describes the Continuity Tester Circuit (BAT85). The principle is very simple, very practical. The circuit components can help you underst...
This article describes the Liquid-Crystal Display (LCD) Tester (CD4047). The principle is very simple, very practical. The circuit components can help ...
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...
This article describes the Improved Vibrating Battery Tester (LM393). The principle is very simple, very practical. The circuit components can help you...
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...
This article describes a 12V battery capacity tester CIRCUIT (1N4003). The principle is very simple, very practical. The circuit components can help yo...
A crystal tester circuit is very simple, it contains only oscillator and detector inside. This crystal tester circuit uses one transistor for the oscil...
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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