Circuit - Square Wave Oscillators Circuits, Page 2 / Schematic List - Circuits designed by David A. Johnson, P.E.

Square Wave Oscillator Circuits, Page 2

Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 12, 2010 12:08 PM

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Dave's Circuits: Astable Oscillator Circuits      Audio Oscillator Circuits      Crystal Oscillators
F (Radio Frequency) Oscillators         Sine Wave Oscillators              Square Wave Oscillators
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Dave's SquareWave Oscillator Circuits: Page 1, Page 2

D-FLIP/FLOP OSCILLATORS
Yes you can turn flip/flop ICs into low current oscillators. This schematic shows you how.

MEDIUM POWER 125KHZ OSCILLATOR
This circuit is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR but adds more inverters in parallel to deliver yet more power. The values shown are for 125KHz.

MEDIUM POWER 125KHZ OSCILLATOR 2
This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz.

MICROPOWER C-MOS OSCILLATOR, DRAWS ONLY 0.5uA
If truly low power oscillators interest you, this circuit draws a mere 2 microwatts (500nA) from a 6v battery. It uses a very inexpensive C-MOS IC to produce a frequency of 2Hz. However, by changing the component values you can push it to 300Hz. The circuit draws much less current than traditional C-MOS oscillators using a Schmitt trigger inverter. It also produces fast leading edges. However, if you need more drive current, a C-MOS buffer should be included. Published in EDN, September 2, 1993.

PRECISION ULTRA LOWER POWER OSCILLATOR
This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. It is highly stable under varying temperature and supply voltages.

PRECISION ULTRA LOWER POWER OSCILLATOR
This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. It is highly stable under varying temperature and supply voltages.

VERY LOW POWER ASTABLE MULTIVIBRATOR
This classic circuit draws only 200 nanoamps from a 1.5v supply.

VERY LOW POWER GATED CRYSTAL OSCILLATOR
The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed. The method keeps the standby power consumption to a very low 1uA when used with a 3v supply.

Dave's SquareWave Oscillator Circuits: Page 1, Page 2

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