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CMOS Iinverter Parallel LC Oscillator
I have used this parallel resonant LC oscillator circuit countless times. The
oscillator frequency is determined by the inductor and capacitor values. I
have shown an adjustable inductor to make it easy to set the frequency to a specific
value. Once set the frequency is fairly stable over supply voltage variations
and temperature changes. The values shown are for 125KHz but the frequency can
range from tens of kilohertz to tens of megahertz. With a 74HCU04 type
inverter, it will oscillate down to about 1.5 volts. If the frequency is low,
you can also use a 74C04 (CD4069) inverter.
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CMOS Inverter 125kHz LC Oscillator
This circuit uses a single CMOS inverter to form a series resonant LD oscillator.
The values shown set the oscillation at about 125KHz buth other frequencies are
possible by changing the main LC values.
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CMOS Inverter Parallel LC Oscillator
I have used this parallel resonant LC oscillator circuit countless times. The
oscillator frequency is determined by the inductor and capacitor values. I
have shown an adjustable inductor to make it easy to set the frequency to a specific
value. Once set the frequency is fairly stable over supply voltage variations
and temperature changes. The values shown are for 125KHz but the frequency can
range from tens of kilohertz to tens of megahertz. With a 74HCU04 type
inverter, it will oscillate down to about 1.5 volts. If the frequency is low,
you can also use a 74C04 (CD4069) inverter.
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CMOS Inverters Form 125kHz Oscillator
This circuit is similar to schematic CMOS INVERTER 125KHz LC OSCILLATOR but inverts
the LC components so the inductor is grounded. Two inverters are needed to
produce the needed oscillation. Again, the values shown set the frequency at
125KHz but can be changed to produce other frequencies.
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CMOS Nand Gate Forms Gated 125kHz Oscillator
This circuit is similar to schematic number 116 but uses a NAND gate as an inverter.
The gate allows the oscillator to be gated on and off. Again, the values shown
set the frequency at 125KHz but can be changed to produce other frequencies.
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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.
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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.
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Ultra Pure 125kHz Sine Wave Signal Source
For some RFID systems operating at 125KHz, a very low distortion signal source
reference is needed. The circuit shown on this page produces a 10-volt
peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01%.
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