74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto 33pF and R2 can be increased to make R2 * C2 = t.
Time constant much less than the period T of the crystal T = 1/F . This is to remove higher frequency components in the Oscillator.
The circuit above is a parallel resonant oscillator circuit. The Crystal works by the piezoelectric principle, piezo means pressure. The electric field causes the impedance of the crystal to change. The LP Record Player needle is the reverse of this, the bumps on the spiral groove of the record applies pressure to needle which generates electricity. Both are piezo-electric effects. see more at Introduction to Fundamental Crystal Oscillators.
Source:http://www.electronics-circuits.com/schematics/arc20050206.html
Thank you.
Related Links Circuit
More about Simple crystal oscillator
More about Oscillator generator
More about Squarewave Oscillator
Squarewave Oscillator by IC LM339
XR2206 Function Generator.
Triangle and Squarewave Generator
32.768 KHz oscillator using a watch crystal
Cmos Logic Clock Oscillator by Ic 4011
X tal Oscillator Frequency by 74LS04
This entry was posted on Thursday, September 20th, 2007 at 5:18 pm and is filed under Digital, oscillator generator.
