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April 28, 2010
This 1.5 volt led fasher runs more than a year on a single 'd" cell and alternately flashes 2 LEDs at about a 1 second rate. The circuit employs a 74HC14 CMOS hex inverter that... [more]
January 18, 2011
The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. [more]
September 27, 2010
This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value. The LED starts flashing when the photo resistor is scarcely illuminated. The... [more]
circuit from:http://www.extremecircuits.net/2009/07/dark-activated-led-or-lamp-flasher.html
June 22, 2010
This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. [more]
October 3, 2010
This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legislation). White LEDs only... [more]
circuit from:http://www.extremecircuits.net/2010/05/high-intensity-led-warning-flasher.html
October 29, 2010
Minimum parts counting Designed for 3V battery operation [more]
October 2, 2010
This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights,... [more]
circuit from:http://www.extremecircuits.net/2009/08/led-or-lamp-flasher-circuit.html
September 27, 2010
This circuit has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an... [more]
January 18, 2011
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 "Night Rider" display. A Schmitt Trigger oscillator provides the clock... [more]
January 18, 2011
When power is applied, the 15K resistor and 10uF cap at pin 15 will reset the counters to the zero count where pin 3 is at +12 and all other outputs are at zero. The... [more]
June 22, 2010
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. [more]
August 8, 2010
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an... [more]
April 28, 2010
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values... [more]
June 22, 2010
It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly. [more]
December 3, 2010
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. [more]
August 8, 2010
In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28... [more]
December 3, 2010
This circuit is a 73 MHz Hallogene Lamp Radio-Controlled. The purpose of it is to control the power state of a hallogene lamp by a remote control. [more]
August 8, 2010
This circuit provides a visual 9 second delay using 10 LEDs before closing a 12 volt relay. When the reset switch is closed, the 4017 decade counter will be reset to the 0 count which... [more]
August 3, 2010
This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I've used a... [more]
September 27, 2010
This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type TL081 opamp. The output current of the... [more]
circuit from:http://www.extremecircuits.net/2010/05/very-simple-led-tester.html
January 16, 2011
The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current. Since the capacitor must... [more]
September 27, 2010
This device was designed on request; to control the light intensity of four filament lamps (i.e. a ring illuminator) powered by two AA or AAA batteries, for close-up pictures with a digital camera. Obviously it... [more]
circuit from:http://www.extremecircuits.net/2009/08/brightness-controller-circuit-for-small.html
November 11, 2010
The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to... [more]
September 27, 2010
The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to... [more]
circuit from:http://www.extremecircuits.net/2010/01/dancing-leds-circuit-diagram.html
August 5, 2010
Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. [more]
circuit from:http://www.extremecircuits.net/2010/05/dc-coupled-audio-amplifier.html
September 27, 2010
Every self-respecting DIYer makes his own electronic dice with LEDs as spots. Then you don’t have to throw the dice anymore – just push the button. The electronics also ensures that nobody can try to... [more]
circuit from:http://www.extremecircuits.net/2010/04/dicing-with-leds.html
April 29, 2010
The circuit below uses a hex Schmitt Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers (74HCT164 or 74HC164) to sequence 16 LEDs. The circuit can be expanded to greater lengths by cascading additional... [more]
November 19, 2010
This circuit operates two LED strips in pulsing mode, i.e. one LED strip goes from off state, lights up gradually, then dims gradually, etc. while the other LED strip do the contrary. [more]
October 3, 2010
This circuit operates two LED strips in pulsing mode, i.e. one LED strip goes from off state, lights up gradually, then dims gradually, etc. while the other LED strip does the contrary. Each strip can... [more]
circuit from:http://www.extremecircuits.net/2010/01/fading-leds-circuit-diagram.html
April 23, 2010
The circuit is based on the IC1 that is 555, for the creation of alternate flashes from the two led D1-2, that can be also different colour. The frequency of alternation can be regulated from... [more]
August 4, 2010
A Battery-status Indicator circuit can be useful, mainly to monitor portable Test-gear instruments and similar devices. LED D1 flashes to attire the user's attention, signaling that the circuit is running, so it will not be... [more]
circuit from:http://www.extremecircuits.net/2010/01/flashing-led-battery-status-indicator.html
September 27, 2010
Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features... [more]
circuit from:http://www.extremecircuits.net/2010/01/ic-controlled-emergency-light-with.html
August 3, 2010
This is a simplified version of the 4-Digit Keypad Controlled Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the... [more]
January 16, 2011
In the circuit, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected... [more]
September 26, 2010
LED Bike Light Circuit Project [more]
circuit from:http://www.extremecircuits.net/2010/05/led-bike-light-circuit-project.html
October 31, 2010
This schematic is version of a simple 10 LED chaser. There is no 555 timer used because at my local electronics store they are over $4 Cdn. Instead, an oscillator made up of two sections... [more]
June 23, 2010
This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is... [more]
October 2, 2010
This circuit operates a LED in pulsing mode, i.e. the LED goes from off state, lights up gradually, then dims gradually, etc. This operation mode is obtained by a triangular wave generator formed by two... [more]
circuit from:http://www.extremecircuits.net/2009/08/led-or-lamp-pulsar-circuit.html
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