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Category: Other Circuits / 555 Timer Circuits Views: 4332 Rank: 0 The LED Torch is based on a 7555 timer running in astable mode (do not use an ordinary 555). A white LED (Maplin order code NR73) produces 400 mcd light output, which, when focussed, can illuminate objects at 30 metres. Try Conrad Electronic for what appears to be a stronger white LED (order code 15 37 45-11). A convex lens with short focal length is placed in front of the LED to focus the beam. If banding occurs at the beams perimeter, use another very short focal length lens directly in front of the LED to smooth the beam. visit page.
Related circuits The unit provides a square-wave output that is rich in harmonic content. The circuit"s output frequency can be varied from 50 Hz to 15 kHz. The heart of the circuit is a 555 astable connected in its equal mark/space mode. The frequency is controlled by potentiometer R2 and capacitor Cl. IR Remote Control Extender Circuit (Mark 3) IR appliances use pulses (control signals) sent over a modulated IR carrier wave. The carrier wave may be modulated at various frequencies, 36-38KHz being the most popular.Some Satellite receivers use even higher frequencies than this. The IR1 remote module receives an infra red signal and... The circuit presented here wakes you up with a loud alarm at the break of the daylight. Once again the 555 timer is used here. It is working as an astable multivibrator at a frequency of about 1kHz. When no light falls on the LDR, the transistor is pulled high by the variable resistor. Hence the... handy voltage-to-time converter The circuit in Figure 1 is a simple, low-cost voltage-to-time converter using the ubiquitous 555 timer chip. You can use the IC`s monostable multivibrator as a voltage-to-time converter by connecting the analog-voltage input to the charging resistor, R, instead of connecting R to VCC. With this... Binary Counter using 555 and 4042B In this circuit diagram, an NE555 timer is used as a pulse generator producing pulses at about one-second duration. This is governed by the timing components connected to pins 2, 6, and 7. If the 100µF capacitor connected on pins 2 and 6 were reduced to 47µF, then the counting pulses will be... This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying the preset VR1. Bell circuit with two 555 timers This simple Bell circuit uses two 555 timers. The frequency is controlled by the capacitors that must be preserved almost identical in value to each other for best results. Fine tuning is done with R1 and R2. An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D2 is a varactor diode. Audio fed to D2 causes FM of the oscillator signal.
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The HPLED pin features short-circuit protection that disables the ADP1653 if it detects a short circuit to ground at the cathode of the LED(s). The ADP1653 monitors the HPLED voltage once the part is enabled in torch mode.
Here is a simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the 5 Volt available from the USB port.The 5V from the USB port is passed through current limiting resistor R2 and ...
This is a simple LED torch.The specialty of this circuit is this circuit helps you to operate your torch for many hours.Here I have used 2W LED.Through this circuit you can light up your torch about one month.Here I have used a ...
Good information about Astro LED Torch Circuit ?? You can learn and download Astro LED Torch Circuit online here !!
Circuit Diagram : Two-Cell LED Torch Circuit Diagram. The inductance of L isn't critical and can be reduced to 3.3 mH if necessary. The impedance of the transformer secondary winding ensures that a resistor is not required in ...
230 V AC Main Operated LED Powerful NIGHT LAMP Circuit Diagram. Please Note That if you want to make this circuit at home, then read carefully all the instructions. Also Note that here is two circuit diagrams, so the first one is ...
DIY 9 volt LED Flashlight v.1.0
Science - Electricity - Experiment with torch and circuit - English
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