I`m afraid the circuit you have there is nowhere near correct. For a start, there is no DC path to the transistor base, so no base bias current is available. Q1 collector and emitter are connected directly to the battery with no intervening impedance, so the transistor cannot deliver any useful output. Hmm. ok. so how do I figure out what R1, R2,
Click here to download the full size of the above Circuit.
Re, RL, and Ce should be I guess I don`t understand what resistor biasing does/means. C1 and C2 in that tutorial should both be the load capacitance (18pF in this case), so that makes sense, but nothing else really does *sadface* Once you have a reasonable collector current, which looks as if it should be a bit over 1mA, for the values you have, the next step is to give the circuit a nudge to try to start it. In the real world noise voltages should do this, but a simulation may need an actual kick. I suppose that you are doing a Transient analysis using something like PSpice. You could try putting a pure current source in parallel with the crystal, and applying a small pulse, say 1mA high for a pulse length of half the crystal period (33ns for a 15MHz crystal). Break the connection between C1 and Q1 base. Make sure Q1 base is still biased. Verify Q1 bias as shown above. Then, connect a signal generator to Q1 base, and measure the voltage at C1, where you broke the connection. If the voltage at C1 is a little higher than the signal generator voltage, then you should get oscillation. I am guessing it won`t be, and you`ll have to make C1 smaller. well the 2nd circuit I posted works fine, it`s the first one that I`m trying to create to understand what is going on. there is something I`m not understanding so let me break down the pieces that don`t make sense in the 15Mhz circuit (working) to try and make sense of the non-working...
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.....
characters left: