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Oscillators:  Crystal    Page 1
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Oscillator Circuits -- Main Page
Last Updated on: Saturday, August 30, 2014 10:28 AM


Circuits Designed by Dave Johnson, P.E. :
  • 40KHZ LED TEST SIGNAL GENERATOR
    This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
0.3V Crystal Oscillator Circuit with Buffered Output -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]
0.5V Crystal Oscillator Circuit with Output Buffer -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]
2 Second Time Base from Crystal Oscillator -  The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0.01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated together to produce the desired division. Using a crystal of some even multiple of 2 is desirable so that one stage of the counter automatically toggles every second which eliminates the need for the NAND gate and reset circuitry, however the circuit below illustrates using a crystal which is not an even multiple of 2 and so requires additional....(electronic circuit added 7/03)
2 Tone Audio Oscillator use for SSB Tests -  amateur radio construction projects…. [from Peter Parker's website]

32.768 kHz Oscillator using a Common Watch Crystal -  Below are a couple circuits you can use to produce a 32.768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second square wave. The circuit on the left using the 4069 inverter is recommended over the transistor circuit and produces a better waveform. The single transistor circuit.... [Bill Bowden's website]
40kHz LED Test Signal Generator -  This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals.... [Designed by David A. Johnson]

5 Hints for Debugging MicroController-based Designs AN 1458 -  Agilent Application Note  (added 6/06)

A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850 -  AN-419-Analog Device Application Notes....[App Note]  

AN-1320: Enhancing CLC031 Jitter Performance with Easy-To-Use VCXOs -  National Semiconductor Application Note  (app note added 2/06)
AN181 Using the Crystal 8900A in 8-Bit Mode -  (app note added 6/07)
AN-400: A Study of the Crystal Oscillator for CMOS-COPS -  National Semiconductor Application Note  (app note added 2/06)
AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850  -  AN-419-Analog Device Application Notes....[App Note]  
AN-666: DTMF Generation with 3.58 MHz Crystal -  National Semiconductor Application Note....[App Note]
AN826: Crystal Oscillator Basics & Crystal Selection for RFPIC™ & PICmicro® Devices -  Microchip Application Note Published 17-Jan-02  (app note added 2/06)
CMOS Oscillator -  ASCII format....
Crystal 32.768kHz CMOS Oscillator -  ASCII format (electronic circuit added 7/03)
Crystal Considerations with Dallas Real-Time Clocks RTCs -  Maxim App Note #58....[App Note]
Crystal Controlled Oscillator (Ramon Vargas) -  The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly.  This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the schematic of a circuit that will perform the task. Unfortunately, there aren't many such circuits in the technical literature currently available, and when found, they don't always work as expected. A circuit that has been found to work at full satisfaction in the frequency range from 10 kHz to 500 kHz is illustrated in Figure 1.  (added 11/05)
Crystal Controlled Time Base Generator -  ....
Crystal Oscillator (Chrontel) -  Chrontel Application Note-06,This application note addresses issues commonly raised during the selection of the reference crystal, typically
14.318 MHz, for Chrontel's product line…..(added 02/05)
Crystal Oscillator (Goran Olsson) -  ASCII format, The world is full of xtal oscillators twiddled by digital designers lacking in the analog design knowledge necessary. Just look at all the PC real time clocks that lags or leads by several minutes per day. And they eat backup batteries too! IC's with pins that say "Xtal here" can't be trusted either!....
Crystal Oscillator (Pericom App Note) -  Pericom Semiconductor Application Note # 083,....[App Note]
Crystal Oscillator Basics & Crystal Selection for RFPIC™ & PICmicro® Devices -  Microchip Application Note Published 17-Jan-02  (app note added 2/06)
Crystal Oscillator overcomes typical Drawbacks -  08/17/98 EDN-Design Ideas....A combinatorial function with a propagation delay greater than the system clock period does not necessarily prevent a design from operating at frequency. By taking advantage of arrival times or carefully using wait states, a design can give the combinatorial circuit sufficient time....File has several circuits, scroll to this one.... [Design Idea by Kevin Skahill, Cypress Semiconductor, San Jose, CA]
CX Minature Crystals Circuits -  Euro QuartzCX-6V-SM (added 02/05)
CX-1SM Crystal 530kHz to2.1MHz -  Statek App Notes (added 02/05)
Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850 -  AN-419-Analog Device Application Notes....[App Note]  
HCMOS Crystal Oscillator -  Fairchild Semiconductor App Note 340, May 1983....[App Note]
 

Oscillators:  Crystal   -   #'s - H        I - Z
Oscillator Circuits -- Main Page

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