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Electronic Transformer Coupled Oscillators – Circuit Schematic
Electronic Transformer Coupled Oscillators
Transformer OCL and capacitor C1 form a tank circuit, to which are coupled sufficient turns to drive the grid in the lower left-hand winding. The output circuit...
Electron-Coupled Oscillators – Circuit Schematic
Electron-Coupled Oscillators
One of the outstanding problems in the design of vacuum-tube oscillators is that of keeping the frequency constant despite mechanical vibrations, temperature ch...
A Simple Audio Oscillator – Circuit Schematic
A Simple Audio Oscillator
A simple oscillator which may be used for code practice. In order to have sufficient inductance to produce an audio frequency, an iron core transformer such as ...
A Hartley Oscillator – Circuit Schematic
A Hartley Oscillator
In the Hartley circuit (Fig. 14 B), the amplified energy of the plate circuit is fed back to the grid circuit by means of fluctuating magnetic fields. They are ...
Sinusoidal Oscillators – Circuit Schematic
Sinusoidal Oscillators
If a linear feedback amplifier contains reactive elements, and at some frequency the loop gain Ab = -1, sinusoidal oscillations will be obtained. The sine wave ...
Tesla Coil – Circuit Schematic
Tesla Coil
This web page is provided to offer assistance and information to anyone that is wanting to construct a Tesla coil. I encourage you to make use of the other reso...
Colpitts oscillator – Circuit Schematic
Colpitts oscillator
The Colpitts circuit, like other LC oscillators, consists of a gain device (such as a bipolar junction transistor, field effect transistor, operational amplifie...
Small Footprint Square Wave Oscillator – Circuit Schematic
Small Footprint Square Wave Oscillator
This is a small footprint 50% duty cycle square wave oscillator with variable frequency from 10kHz to 30MHz. The frequency range can be extended to 1kHz by usin...
ICL8038-based Oscillator – Circuit Schematic
ICL8038-based Oscillator
The circuit is a fairly easy design: It consists of the actual VCO (ICL8038 with supplement parts), the sine and triangle output stage (LT1210) and the CMOS-com...
Precision Clock Generator – Circuit Schematic
Precision Clock Generator
The device presented here can generate a complementary clock signal at frequencies of 10Hz to 10MHz in steps of factor10. Thus, I chose to call it "10xHz clock ...
Frequency counter Oscillator schematic – Circuit Schematic
Frequency counter Oscillator schematic
The oscillator provides a 1MHz and a 1khz clock. The 1MHz clock is used as the clock for the microcontroller and as timebase for millisecond measurement. I use ...
ONE FILTER THREE PHASE SINE WAVE GENERATOR – Circuit Schematic
ONE FILTER THREE PHASE SINE WAVE GENERATOR
It is possible to build a three-phase sine-wave oscillator using just one UAF42 state variable filter along with some resistors and diodes. Three output nodes a...
BENCHTOP FUNCTION GENERATOR WITH BUILT IN COUNTER – Circuit Schematic
BENCHTOP FUNCTION GENERATOR WITH BUILT IN COUNTER
This circuit will produce sine, square, and triangle waves from 0. 1 Hz to 1 MHz and has a counter which will read the frequency of the function generator or an...
MORSE CODE OSCILLATOR – Circuit Schematic
MORSE CODE OSCILLATOR
The circuit is built around a 555 oscillator (IC1) and an LM386 audio amplifier (IC2). The 555 circuit is an astable oscillator, with the chip output retriggeri...
LINEAR VCO – Circuit Schematic
LINEAR VCO
This VCO uses an LF356 op amp to produce a linear frequency vs. voltage characteristic using the CMOS HC4046. The frequency range can be changed by changing the...
CRYSTAL TESTER – Circuit Schematic
CRYSTAL TESTER
JFET Pierce oscillator will test any crystal from 50 kHz through 25-MHz upper frequency limit of fundamental-mode crystals without tuning, and drive counter for...
SHORTWAVE PULSED MARKER OSCILLATOR – Circuit Schematic
SHORTWAVE PULSED MARKER OSCILLATOR
A useful marker oscillator can be made using an NE555 to pulse the oscillator at an audio rate. This makes it easy to find the signal in the presence of interfe...
LIGHT SENSITIVE AUDIO OSCILLATOR – Circuit Schematic
LIGHT SENSITIVE AUDIO OSCILLATOR
This circuit`s frequency of oscillation increases directly with light intensity. The greater the light intensity, the higher the frequency of the oscillator. Th...
20 MHz VHF CRYSTAL OSCILLATOR – Circuit Schematic
20 MHz VHF CRYSTAL OSCILLATOR
A typical circuit at 20 MHz is shown. The crystal, which has an internal series resistance RS, of 14 ©, oscillates at its third harmonic. The diode clamp D1 an...
SQUARE TRIANGLE VCO – Circuit Schematic
SQUARE TRIANGLE VCO
With DC control voltage of 5 mV to 5 V, circuit controls frequency of both square and triangle outputs with good linearity. Peak value of triangle output is pre...