This is a Simple Panel Frequency Meter Circuit Diagram to measure the frequency of 230V AC mains. When you connect it to the 230V...
Friday, February 28, 2014
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Audible Logic Probe
When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With...
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Oil Temperature Gauge for 125 cc Scooter
Lots of Far-Eastern scooters are fitted with GY6 engines. These already elderly units are sturdy and economical, but if you want to “push” the...
Thursday, February 27, 2014
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20 Watt Power Amplifier
This IC chip was designed specifically for use in power boosting applications in automobiles. It is self protecting against short circuits and thermal problems....
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Outdoor Lighting Controller
When you step out of your brightly-lit house into the darkness, it takes a while for your vision to adjust. A solution to this...
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Signal Tracer
The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide...
Wednesday, February 26, 2014
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Simple Electromagnetic Field Detector Schematic
This circuit is sensitive to low frequency electromagnetic radiation and will detect for example hidden wiring or the field that encompasses a transformer. Pickup...
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Temperature Monitor Circuit Diagram
A simple op-amp circuit that will trigger a relay when a preset temperature is reached. Please note that there is no hysteresis in this...
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Three Flashing LED Doorbells For The Hearing Impaired
When the push switch is operated - the buzzer will sound and the LEDs will begin to flash. For the hearing members of the...
Tuesday, February 25, 2014
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Build a Smart battery charger
This is a smart battery charger can protect your vehicle's battery from failing and will prolong its life – they're fully automatic so you...
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High LASER Power Supply
If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be....
Monday, February 24, 2014
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Temperature Monitor for Electronic Equipment
Build a Temperature Monitor for Electronic Equipment circuit diagram. As most electronics components’ characteristics vary with temperature, they are selected as per expected operating...
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Build a Converter : VGA to BNC Adapter
There are monitors which only have three BNC inputs and which use composite synchronization (‘sync on green’). This circuit has been designed with these...
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Simple Car Battery Voltage Monitor Circuit
This circuit is used to monitor the battery voltage to display a dual-colored LED status of the battery to. If the LED “green”battery voltage...
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Made Dual Regulated Power Supply
Notes:In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of...
Sunday, February 23, 2014
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Simple Dome Lamp Dimmer Circuit Diagram
This is a Simple Dome Lamp Dimmer Circuit Diagram. A reading light inside the car greatly assists passengers during night, but often the interior...
Saturday, February 22, 2014
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Simple 0-30 VDC Stabilized power supply with current control 0.002-3 A
This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. The circuit also...
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Now Low-Cost Arduino Thermal Camera
Do you still remember the H1N1 outbreak in Asia? The manifestations are usually flu-like symptoms which includes fever, cough and colds. The best way...
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Simple Water Alarm Schematic
The LM1830 fluid detector IC from National Semiconduc tor is designed to be able to detect the presence of fluids using a probe. This...
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Sooper Amplifier Using BEL1895 I.C
Here is a very simple and easy to use audio amplifier using I.C BEL(Bharat electronics limited)1895 , a very common IC. This circuit can...
Friday, February 21, 2014
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Simple Sixteen Stage Bi-Directional LED Sequencer
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders"74HC138 or 74HCT138) to generate the popular...
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Door Opener Alarm Circuit Diagram
The door opener derives its power from a 9-V battery. A momentary-contact switch, 52, is provided in the event that manual opening and closing...
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Build a LED Mini Audio Analyzer circuit Diagram
This analyst is, a sensitive instrument, in the frequency changes and width of a acoustic signal. Thus the brightness of LED that turns on...
Thursday, February 20, 2014
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Build a Simple +12v to +9v converter
This little circuit uses a LM317 variable voltage regulator to adjust the input voltage down to +9 volt, or whatever else you need. Just...
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10W Small Audio Amplifier
This is a simple 10W Small Audio Amplifier circuit diagram. You can use this powerful amplifier in any small audio project. It is very...
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Simple Automatic Load Sensing Power Switch
This circuit will automatically switch on several mains-powered "slave" loads when a "master" load is turned on. For example, it will switch on the...
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