2N3053 TRANSISTOR PDF

Check out the Amazon Electronic Component Packs page. In particular, his interest centred around the amateur radio band of 30 metres Various topics and design principles had been previously discussed and in the end I decided to present an experimental transmitter for CW morse code QRP low power less than 5W for operation on the 30M amateur radio band. Bill has on hand some T toroids so we will try and use them but I will suggest other types.

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Check out the Amazon Electronic Component Packs page. In particular, his interest centred around the amateur radio band of 30 metres Various topics and design principles had been previously discussed and in the end I decided to present an experimental transmitter for CW morse code QRP low power less than 5W for operation on the 30M amateur radio band. Bill has on hand some T toroids so we will try and use them but I will suggest other types.

For our purposes, as a guide to demonstrate design principles, I decided to go back to basics and use a conventional crystal oscillator. Although in my pages on crystal oscillators I stress the need for a buffer amplifier I decided for sake of simplicity not to use one here oh heresy! Here is our 30M crystal oscillator.

There is nothing special about this one. You will note wherever possible I will try and make many components the same value e. My reasoning here is it is a lot more convenient to keep re-using same values, less storage, often cheaper buying.

Figure 1. The transformer T1 and associated variable capacitor I will discuss later when we start to work backwards in our design. Now on to the driver amplifier stage. I want about 1. Figure 2. Figure 3. We have T2 a centre tapped secondary transformer. Note the CT is at ground. Similarly we have two 10 ohm 10R resistors going from base to ground of each transistor.

Also in the collectors of bother transistors are 36V Zener Diodes for protection. Also in both collector lines going to the primary of T4 we have in both instances two 0. Again none of those values are especially significant although the choke ideally would be capable of carrying one ampere of current. The polarised capacitor should not be less than 25V rating. Having dispensed with the preliminaries and bearing in mind there is absolutely nothing remarkable about any of these circuits we will now discuss the "meat" which rarely gets discussed elsewhere - the how-to-fors.

These following principles more or less apply at any frequency, even though this design is for 30 metres I will constantly talk in reactances. In my opinion this is the only way to proceed with any designn and a jolly good habit to get into.

We require 5W output from a 12V supply and feeding a 50 ohm load. Firstly let us be clear all our calculations are based on that 12V figure and a presumed genuine load of 50 ohms. If either should vary then the results you achieve vary accordingly, just had to get that off my chest because it is rarely mentioned elsewhere.

Here it is used as an aid to suppress harmonics of our fundamental signal which in this example is around 10 Mhz. This particular filter is simply two "L" network LC circuits back to back forming a "T" network, designed for 50 ohms in and out. Now how good or sharp a filter do we want? This is called "Q" or more correctly loaded "Q".

Sometimes you might want to fiddle with that loaded "Q" number purely to accomodate components you might have on hand. The number 4 is NOT sacred, it could have been 2, 3, or 3.

I would not recommend going beyong 5. Now I said these were simply two "L" type networks. Look at figure 4 below. Figure 4. If we make our cut off point around If not then your stuck with a pF fixed capacitor. Terribly easy. Other frequencies of course produce different inductances and capacitances for and ohms respectively.

Got that? Therefore T4 needs to transform, backwards, 50 ohm to Here you have a couple of options. The output "T" network will introduce some losses and to make up for this you could shoot for marginally high power output to compensate. In that case you could make T4 a straight 50 ohm CT to 50 ohm transformer, on the other hand you may elect to make T4 strictly according to "Hoyle".

An impedance ratio of If we use a T toroid then that equates to around So there you go, use 34T CT primary and 32T secondary or simply make them both the same around those numbers. Different toroids, different frequencies, different values by calculation. Here again we can use a reactance of about 4 times the At mid-band again we get a required inductance of 3. You need to use at least 26 wire, perhaps preferably T is capable of only 31T of 26 wire and 23T of You could reduce turns by either using a larger toroid e.

T or use a ferrite toroid such as T A T iron powder toroid requires 30 turns instead of the 35 for T However you can consider using a little known trick. Stacking two toroids together almost doubles its AL value. In this event 3. Worth a thought! A bi-filar winding of 3. The comments about wire sizes also applies to transformer T4 and inductors L2 and L3. You have the output low pass filter which will help determine the output power of the driver stage.

Happily a 50 ohm load will provide this nicely. If the driver stage provides 1. The output filter C1, L1, C2 could be designed for whatever loaded "Q" you wanted. At around Fc The RFC in figure 2 needs to have a reactance of around 5 to 10 times the load resistance 50 ohms here.

In this event something between ohms and ohms or around 3. Ensure a suitable gauge wire to reduce power drops. This stage is keyed hope it works and the PNP transistor can be any general purpose type such as 2NA, 2N or whatever you can get your hands on. Here all we need concern ourselves with is T1 and the associated variable capacitor. Link to this page NEW! No HTML knowledge required; even the technophobes can do it. All you need to do is copy and paste, the following code.

All links are greatly appreciated; I sincerely thank you for your support.

GUARDERAS SEMIOLOGIA PDF

2N3053 . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características

Transistor action is triggered by the free movement of electrons from its base side. These free electrons act like a bridge between emitter and collector. Circuit Diagram of 2n The Circuit diagram of 2n is shown in the figure below. In order to flow current from emitter to collector, base voltage must be positive with respect to emitter.

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