The 4MHz Crystal Oscillator is a crystal oscillator circuit that provides clock pulses of 4 MHz frequency. It sustains oscilllation by taking a voltage signal from the quartz resonator, amplifying it and  providing feed back to the resonator.

The 3.579MHZ Crystal Oscillator is an oscillator that provides clock pulses of 3.579MHz frequency. It is commonly used to keep track of time, to provide a stable clock signal for digital integrated circuits and to stabilize frequencies for radio transmitters and receivers. It is applicable many applications due to its inexpensive function, for example DTMF generators

The 24MHz Crystal Oscillator is a standard frequency crystal oscillator circuit that provides clock pulses of 24MHz frequency. It sustains oscilllation by taking a voltage signal from the quartz resonator, amplifying it and  providing feed back to the resonator. It can be used as clock source for high speed USB and LCD modules.

The 11.592 MHz Crystal Oscillator is a crystal oscillator circuit that provides clock pulses of 11.0592 MHz frequency. It sustains oscilllation by taking a voltage signal from the quartz resonator, amplifying it and  providing feed back to the resonator. It is a odd value crystal oscillator that is perfectly divisible for generating standard baud rate for serial communication with PC.

The 12MHz Crystal Oscillator is a standard frequency crystal oscillator circuit that provides clock pulses of 12MHz frequency. It sustains oscilllation by taking a voltage signal from the quartz resonator, amplifying it and  providing feed back to the resonator.

The 16 MHz Crystal Oscillator Module is that is designed to handle off-chip crystals which has a frequency of 4-16 MHZ. It is applicable for electronic and DIY projects.

The 20MHz Crystal Oscillator is a standard frequency crystal oscillator circuit that provides clock pulses of 20MHz frequency. It sustains oscilllation by taking a voltage signal from the quartz resonator, amplifying it and  providing feed back to the resonator. It can suitable for applications like: -  computers, small umpc, digital television, electronic boards, etc.