In the earlier lessons we had about transformers, we kind of assumed that these devices were flawless. This means we thought their windings did not experience any core losses or copper losses at all. But when we actually use a transformer “on-load” we have to face the reality that there are always going to be […]
Understanding
Understanding FET Current Source: Explained with Formulas
An FET Current Source is a specific kind of active circuit which employs a Field Effect Transistor to provide a steady and a constant amount of current to a circuit. Now you might wonder why it is important for us to have a constant current. Constant current sources and their opposite, which we call current […]
Understanding Junction Field Effect Transistors, with Calculations
In this post I will talk about the Junction Field Effect Transistor, or in short, the JFET. This device is actually a unipolar device, which basically means that it has a pretty quick way of controlling the flow of current between its two electrodes. This happens because of an electric field that kicks in when […]
Understanding Quartz Crystal Oscillator Circuits, with Calculations
Quartz crystal oscillators allow us to overcome a number of issues that may have a substantial impact on the frequency stability of an oscillator circuit. These influences include, but are not restricted to, temperature variations, fluctuations in the load connected to the oscillator, and even changes in the DC power supply voltage. All of these […]
Understanding RC Oscillator Circuit, with Formulas
We all known that a single-stage transistor amplifier, when built as a common-emitter amplifier, may initiate a 180-degree phase shift between its output and input signals. This built-in characteristic of the amplifier design could be used to build an effective RC oscillator circuit. Interestingly it may be possible for us to construct transistor stages to […]
Understanding Hartley Oscillator Circuit, with Calculations
The basic LC Oscillator tank circuit that we discussed in one of our earlier posts has a significant limitation: it cannot alter the magnitude of its output oscillations. This means that the oscillations might be either too large or too little, making it difficult to get the desired results. It might also be difficult for […]