This page lists a few transistor circuits not found on other pages because no topic exists. However the circuits do serve to make some specific point, but do not come with a description. An example of an RF amplifier circuit using a transistor is shown below. The transistor is identified as TUT which stands for Transistor Under Test. The point of
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the schematic is to show the additional components required in an RF circuit. Also note that the case of the transistor is grounded and there appears to be metal shield being used on the printed wiring board. Although there is no clear-cut definition of what the dashed grounded lines means. Many transistor cases have an un-committed metal case or tab that may be used for either grounding or heat dissipation. Note that C5 is a Feed-through Capacitor used to suppress EMI between inter-panel connections. The next circuit example below is also an RF circuit. In this case the transistor is labeled as DUT for Device Under Test, because the circuit is a setup to test operating characteristics of the transistor. Note the heavy use of variable capacitors, or trimmer capacitors normally implying an RF circuit. Coaxial connectors are shown as 50 ohm inputs and outputs, depicted by the cycle around the dot. The next circuit is also another RF circuit except this time it depicts an actual VHF transistor amplifier. The difference here is the shielded screen around the transistor case, and the switchable inductors [which are ganged together]. This next circuit is another RF FET amplifier. This particular example uses a four lead package with the fourth lead being connected to the transistor case, which is than grounded. Again 50 coax connectors are shown.
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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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