Xenon

Initially the neon and xenon lamps are not conducting and act like a very high (almost infinite) resistance. Capacitors Cl and C4 in conjunction with DI and D2 form a voltage doubler circuit, which can charge C2 up to about 300 Vdc after several ac cycles. Voltage increases as current is supplied through Rl and R2. Neon bulb II will all of a sudden start to conduct when the voltage across C3 reaches II's ionization potential. While conducting, the resistance of the bulb.....

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In this strobe-light, two circuits are needed; one circuit charges a capacitor placing 320 V de between the cathode and anode of the flashtube. The other circuit provides bursts of approximately 4000 V to trigger the flashtube into conduction. The voltage-doubler works by summing two equal voltages in series, which results in a doubling of the voltage. The 4000 V needed to trigger the flashtube is provided by transformer Tl-a voltage step-up transformer that develops.....

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The circuit is activated by an LED/photoresistor isolator (Ul), which is a combination of a light-dependent resistor (LDR) and an LED in a single package. That device was chosen because of its high isolation (2000 V) characteristic, which is necessary because the strobe part of the circuit is directly connected to the ac line.The voltage divider is formed by R2, Ul`s internal resistance, and R3. When Ul`s internal LED is off, Ul`s internal LDR has a very high resistanceon.....

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This strobe gives a visual indication of a sensor input. The input signal causes Ul, a light dependent resistor, to chaijge CI..

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This strobe light operates from standard 120-Vac power. Rl limits the amount of current applied to the voltage doubler stage, which is comprised of CI, C2, C3, Dl, D2, C4, C5, and C6. Capacitors CI, C2, and C3 are connected in parallel and form a capacitance of 30 at 160 V. Capacitors C4, C5, and C6 are connected in series and form an equivalent capacitor of about 53 at 480 V. Diodes Dl and D2 not only rectify the ac voltage, but also complete the voltage doubler stage,.....

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Using a voltage-doubler supply, this circuit charges a 60-/aF capacitor and discharges it through a Xenon lamp. The SIDAC dev..

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This circuit uses a voltage doubler CR1 and CR2 to obtain about 280 V dc across Cl. C2 and R3 form a voltage divider to obtain a dc voltage to change C3 thru R2. ..

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I designed this circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch fresnel lens at the transmitter end and a matching 12 inch lens with a PIN photo diode at the receiver. The receiver system was connected to a weather station and a computer to collect the changes in intensity of the light flashes.....

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This circuit uses a small 2.5mm square photo diode in conjunction with a 100mH coil to detect the short light flashes from a xenon lamp. The coil makes the circuit immune to normal room lights...

This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don`t need to build or wind any coils or transformers. This is a cheap-and-dirty experimenter`s circuit. I tested this and it worked for me, but I disclaim all warranties! The LM386 audio amplifier, R1 and R2, and C1 and C2 are used to make a crude Wien bridge oscillator. The R1-R2-C1-C2 network has minimum loss and no phase shift at approx. 3.5 kilohertz and serves as the positive.....

This is one of my stroboscope designs. Usually many stoboscope circuit work directly from mains voltage, but this circuit uses 12V DC intead od mains AC. This is very good idea if you don't want to mess with direct mains voltage connected circuit or you want to run the stroboscope from batteries. The circuit has some special functions compared to other stroboscope circuits found electronics books. First the there is a switch for selecting the flash power: with C3 you can.....

Principle of the operation: Q1, R1, T1 and D1 form a DC-DC converter to convert +3V voltage from batteries to +200..+500V voltage which is charges the main flash capacitor C1. Resistor R4 and potentiometer P1 form a voltage divider and C2 is changed from that voltage though R3. When C2 reaches 70V voltage, the neon bulb N1 in the circuit starts to conduct and trigger the triac Q2. Thyristor causes C2 discharge through trigger transformer T2, which generates a short high.....

If you have no idea what is a "strobo", "strobe", "stroboscopy" or whatever way it is called, it is simply a flashing light. It is usually used on police cars, 'disco' places and many interesting applications, including scientific ones. This project is dangerous because it implicates high voltages, it can be lethal. Please read the Disclaimer about my articles: Use this material as educational only, do not build this project unless you know what you are doing and under.....

This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don`t need to build or wind any coils or transformers. This is a cheap-and-dirty experimenter`s circuit. I tested this and it worked for me, but I disclaim all warranties!..

This discussion covers 3 different Xenon flashing circuits from disposable cameras. From them, you will learn circuit tricks that have NEVER been shown in any theory book. The first circuit covers 6 BUILDING BLOCKS. You will need an old "disposable Flash Camera" plus two extra parts to carry out the modifications...

This is the matching transmitter for the air transparency monitor receiver. The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds...

The MOSFET speed controller presented here took over six months to design and fully test, back around 1988. I designed it from the ground up, as I found there were no suitable circuits or units available anywhere at the time. Those that had been published before either required unobtainable servo chips, or were so unstable as to be useless. I took one designed by a British hobby magazine to a race meeting once. It had been okay around home, but the interference from other.....

This line powered xenon flash circuit drives a small camera type flash tube. It has an optical isolator to allow the flash to be safely triggered from some remote device. A flash rate of 2Hz is possible with the circuit...

Views: 74 | Votes: 83 | Comments: 0 | Rating: 9 | Rank: 2 | Added: Dec 1, 2012 |

Since the circuit operates at greater than mains potential and is not isolated by a transformer, it is extremely dangerous. The DC operating potential is about 340V, and there is more than enough stored charge to kill you many times over (although in my experience, once is usually sufficient). This is not meant to be funny - this is truly serious stuff. In addition, the circuitry usually is directly mains (line) powered, with no isolation. Discharge all capacitors before.....

The reason why I built this unit is becasue I need to trim my transmitters for the best performance, I have noticed that I can't be at the receiver position and the transmitter position at the same time! So, what I have invented is a XFI. I connect the receiver to a decoder (PIC16F84) wich will trigg the XFI. I can now trim the transmitter for best performance by sending a signal wich will controll the XFI.When power is switched on, the power over the Xenon tube is zero......