DiscoverCircuits.com, has 30,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to or post your
design.
The contents & graphics
of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB
SITE server
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.
Ultra Low Power
32KHz Crystal Oscillator
I have used this circuit many times when I needed a low frequency reference,
which did not draw much power. With the components show, the current
from a 3v battery is less than 1.2 microamps.
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.
