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Ultra Low Power Astable Multivibrator
Taking advantage of some voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 microamps. With the inclusion of a diode, the circuit can also
produce short pulses instead of a square wave signal.
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MICROPOWER C-MOS OSCILLATOR, DRAWS ONLY 0.5uA
If truly low power oscillators interest you, this circuit draws a mere 2 mircowatts (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.
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CHEAP LOW POWER 3V 2Hz OSCILLATOR
This is yet another method to generate low frequency output pulses. The circuit uses an inexpensive under-voltage monitor IC and a couple of cheap MOSFETs. It could easily be modified to
produce pulse frequencies from about one cycle per minute to a maximum of about 10KHz. It draws only about 1uA from a 3v battery. This circuit should not be used if frequency stability is
important, since it will change as a function of supply voltage.
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- CHEAP LOW POWER 3V 2Hz OSCILLATOR
This is yet another method to generate low frequency output pulses. The circuit uses an inexpensive under-voltage monitor IC and a couple of cheap MOSFETs. It could easily be modified to
produce pulse frequencies from about one cycle per minute to a maximum of about 10KHz. It draws only about 1uA from a 3v battery. This circuit should not be used if frequency stability is
important, since it will change as a function of supply voltage.
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- CMOS SCHMITT TRIGGER IC MAKES VCO
By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the
output of the 4584 to maintain a constant TTL logic level signal
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- Low Power Oscillators
This page has two unusual two-transistor oscillators. I set the component values for a low frequency application. Both circuits draw only about 1 microamp of current.
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- 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.
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- 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.
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- Ultra Low Power Astable Multivibrator
Taking advantage of some new voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 microamps. With the inclusion of a diode, the circuit can
also produce short pulses instead of a square wave signal.
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