The TEM that we have, the Jeol 2000fx is equipped with two extra detectors, one secondary electron detector, i. e. SEM imaging, as well as a STEM detector at the bottom of the microscope. Because the system are from the 80`s the imaging from these detectors is (read `was`)accomplishedby using photographic film to copy the image shown on the CRT. An
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extra CRT monitorspecificallyused for this task is located in a free standing box in which the camera with light sensitiv polaroid film is attached to. Nowadays, everything is digital, and polaroid imaging is therefore not very user friendly or timesaving. Besides, one of the two CRT`s used for setting upp the image to be captured is broke in our system and the other one is almost burned out. -Time to move into the nextcenturyof technology. By different means I found out that the ASID panel, i. e the one thatcontrolsthe scanning of the electron beam during SEM/STEM imaging, has a extra contact hidden behind the backpanel, labeled SG6, figure 1. Figure 1, After opening the back-panel of the ASID unit the signal generator card (SG) is somewhat exposed as well as the extra contact SG6, used for external scan control. If one looks at thecircuitdiagram, figure 2, one can se that the external scan mode is activated by connecting pin 5 of the SG6 to ground. This mode bypass the scan generator function of the ASID panel and allows you to insert your own scan signals at pin 1 and 2 for horisontal and vertical. The signal level happens to be ±10 Volts and this is lucky thus the PXI-6229 card that I use for this task also has this amplitude range limit. To connect to the SG6 I assembled a signal cable from SG6 internally to the front of the ASID, a switch was used to connect pin 5 to ground, and the horisontal and vertical scan...
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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