|
Oscillators:
RF (Radio Frequency)
Power
Supplies -- Main Page
Oscillator Circuits -- Main Page
Last Updated on:
Tuesday, April 17, 2012 08:17 AM |
|
|
Circuits Designed by Dave Johnson, P.E. : |
|
|
- 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.
|
|
- 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 but other frequencies are
possible by changing the main LC values.
|
|
|
|
|
|
|
|
|
|
|
|
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
|
|
144MHz oscillator for test - (electronic circuit added 05/06/07) |
|
144MHz RF FM oscillator - (electronic circuit added 05/06/07) |
|
|
|
175kHz Inductive Pulse Receiver - This circuit is discussed in more detain in
the Experimenters Journal. The receiver’s six inch diameter coil detects the ring signal
from the above transmitter and use a single NPN transistor to provided enough
amplification for the signal to be easily viewed on an oscilloscope.... [Designed by David
A. Johnson] |
|
200mhz-400mhz Voltage Controlled Oscillator (VCO) - If you need a clean emitter
coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses
four voltage controlled capacitors to change the frequency.... [Designed by David A.
Johnson] |
|
Basic RF Oscillator #1 - This circuit switches a relay at dark via a Light
Dependent Resistor or LDR for short. The applications are numerous. In my
application, it switches on a light with an older type movement sensor and is mounted on
the top corner of my workshop with the LDR facing upwards. The Dark Activated Relay
prevents that the light is triggered during daylight hours. But, it can also be used
to switch led-beacon lights for your driveway, or whatever.... [Tony van Roon's circuit] |
|
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. …. [Designed by David A.
Johnson] |
|
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....
[Designed by David A. Johnson] |
|
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. …. [Designed by David A.
Johnson] |
|
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.... [Designed by David A. Johnson] |
|
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.... [Designed by David A. Johnson] |
|
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.... [Designed by David A. Johnson] |
|
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.... [Designed by David A. Johnson] |
|
OpAmp Oscillators Simplify RF Designs - 10/10/96 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new link.
|
|
RF oscillator uses current-feedback op amp - 3-Oct-02 Issue of EDN A
current-feedback amplifier is a well-known component with many uses. Its basic block
diagram shows that its input stage is a voltage follower—in practice, a symmetrical
emitter follower (Figure 1]. The configuration samples the output current, converts it to
voltage across a large impedance, and amplifies it to the output using a high-power,
low-output-impedance amplifier.... [Design Idea by Victor Koren, Tioga Technologies Ltd,
Tel Aviv, Israel] |
|
VCO 1420MHz...2250MHz - .... |
|
VCO test 1000MHz...1500MHz - .... |
|
VCO test 1300MHz...2400MHz - .... |
|
VCO 1000MHz...1500MHz - .... |
|
VCO 1200MHz...2400MHz - .... |
|
VCO 144MHz...146MHz - .... |
|
VCO 15MHz...25MHz - .... |
|
VCO 350MHz...1000MHz - .... |
|
VCO 450MHz...1000MHz - .... |
|
|
|
Power Supplies -- Main Page
Oscillator Circuits -- Main Page |
