Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
If this question is related to your modeling, you will need more than the base operating frequency. I got interested in that about a year ago for filters and needed to do some characterizations. There is a lot on the Internet, including online calculators. Unfortunately, I neglected to copy links to the online calculators, but these links may help:
This link goes to Wes Hayward's original article: Wes Hayward, W7ZOI,” Refinements in Crystal Ladder Filter Design,” QEX, June 1995, pp 16-21.
That is also published here: QRP Power, ARRL Publication No. 210
I no the circuit the thing is I got lot of unmarked ones guess I just wire something up.
I was looked at google. i was just wanting to see what any of you used. jpanhalt ive not figured ho to make crystal out of cap for qucs cant find a crystal but im sure i will figure it out lol
In LTSpice, there is nothing to make. Crystals and capacitors are electronically the same. The only difference is a tarted up symbol for the crystal:
You select the same variables for either. I don't know in qucs whether you have the same choices for a capacitor. If you do, it will work for a crystal too. Unless you know the inductance and resistance values, you can do a lot of trial and mostly error before hitting on what works. That is where one of the online calculators might come in handy in addition to a representative datasheet.
An oscillator based on an inverter is the easiest one to use for most crystals. Putting a resistance of a few kΩ in parallel with the inverter, and having the series resistance very low or shorted will encourage overtone oscillation.
You need very specialist equipment to work out whether a crystal is supposed to be a fundamental or an overtone, but the frequency it runs at will usually give you an indication, as the crystal will be adjusted to expected mode. The 3rd overtone isn't exactly 3 times the fundamental, but it will be a few hundred ppm (parts per million) different. So a crystal that runs at 10.0024 MHz or 30.00006 MHz will most likely be designed to run at 30 MHz