This is the another UHF-TV pre-amplifier circuit diagram which simpler than the previous UHF TV preamplifier. This circuit is based MPSH10. Alternatives that could be put to use to replace MPSH10 are BF180 and BCY90. The tuned circuit comprising the 15nH inductor and 2. 2pF capacitor resonate in the center of the UHF band. The 2. 2pF capacitor coul
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d be exchanged for a 4. 7pF as well as a trimmer capacitor of 2-6pF for better outputs. The coil is half a turn of 18-20 SWG copper wire bent around a half inch drill bit. This ensures a low Q and therefore broad tuning. High frequency function needs special construction methods to prevent instability (unwanted oscillations) caused by feedback from output to input. Veroboard is not appropriate for this project as the capacitance between tracks is about 0. 2pF. A better approach would be to use tag-strip or a PCB. The circuitry need to be enclosed in a metal case and also a screen made in between input and output. As the transistor is applied in common base mode, its low input impedance can be a great match for 50-75 ohm coax cable, whilst at the same time supplying full voltage gain towards the upper frequency limit of the device. The 15nH inductor load, having nearly a short circuit impedance at DC, has an impedance of 56ohms at 600MHz. This inductance and 2. 2pF capacitor form a tank circuit at the transistors collector, delivering maximum gain at resonance. Note: even so that the voltage gain will probably be decreased under load, when the circuit is connected towards the input of a Television set or perhaps a quite long piece of coaxial cable as an example. An RF power amplifier is a type of electronic amplifier which is utilised to convert a low-power radio-frequency signal into a larger signal of significant power,...
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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