The SSY-1 is a small pulsed Nd YAG laser originally used as part of the laser rangefinder in the M1 Abrams tank. The laser head and PFN-1 pulse forming network (flashlamp capacitor, inductor and diode) are readily available for under $250 as surplus on eBay and Meredith Instruments. For more information on the laser, a useful source of informatio
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n is Sam`s Laser FAQ. With the laser head and pulse forming network in hand, all that is left to have a complete working laser is a power supply to charge the capacitor in the pulse forming network, and a high voltage trigger for the flashlamp. The power supply here fulfills these two roles. With the exception of a few resistors and the trigger transformer, I built this entirely from scrap parts I had, so none of the components are particularly special and may be substituted with a similar component. The case and main power transformer were originally part of a pulsed argon laser, and the power transformer just happened to be ideal for this power supply, and the case worked nicely as well. I originally wanted to have everything except the laser head in one box, but this case was far to small for the pulse forming network to fit inside, so now it sits externally with the laser head. The high voltage regulator transistor Q3 was originally the horizontal output transistor in a monitor, and I chose this transistor because it was literally the first one I picked out of my transistor bin with a high enough voltage rating. Any NPN transistor with a voltage rating at or above 1200V that can handle a few hundred milliamps should do. The capacitor in the pulse forming network requires between 700-900VDC. This voltage is provided by rectifying the 700V winding of T1. Current limiting is provided by resistors R3-R5, and the voltage is...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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