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Wien bridge sine wave oscillator – Circuit Schematic
Wien bridge sine wave oscillator
Using the 2N5457 JFET as a voltage variable resistor in the amplifier feedback loop, produces a low distortion, constant amplitude sine wave getting the amplifi...
Sine-square wave oscillators – Circuit Schematic
Sine-square wave oscillators
This circuit will provide both a sine and square wave output for frequencies from below 20 Hz to above 20 kHz...
Sine wave oscillator – Circuit Schematic
Sine wave oscillator
The oscillator delivers a high-purity sinusoid with a stable frequency...
Audio oscillator – Circuit Schematic
Audio oscillator
Almost any transistor will work...
Very low frequency generator – Circuit Schematic
Very low frequency generator
Wien bridge oscillator generates frequencies of 1 Hz and 2 to 20 Hz in 2 Hz steps. Maximum output amplitude is 3 volts rms of 8 volts peak-to-peak...
Wien bridge oscillator II – Circuit Schematic
Wien bridge oscillator II
Wien bridge sine-wave oscillator using two RCA CA3140 op amps cover» 30 Hz to 100 kHz with less than 0 percent total harmonic distortion. The 10k pot is adju...
Wien bridge oscillator – Circuit Schematic
Wien bridge oscillator
Field effect transistor, Ql, operates in the linear resistive region to provide automatic gain control. Because the attenuation of the RC network is one-third a...
Harmonic generator – Circuit Schematic
Harmonic generator
This circuit will produce 50µV harmonics through 1296 MHz with an input of 05-1 V from a 100 or 1000 kHz crystal oscillator...
Subaudible tone encoder – Circuit Schematic
Subaudible tone encoder
This twin-T oscillator produces six preset subaudible tones from 93 to 170 Hz...
Code practice oscillator II – Circuit Schematic
Code practice oscillator II
Oscillator, works with2 to 12Tdc (but 9 to 12 volts gives best volume and clean keying)...
Code practice oscillator – Circuit Schematic
Code practice oscillator
This simple cpo uses the 7404 low-power Schottky hex inverter. C is a 5- to 30-µf electrolytic selected for the desired pitch...
Electronic keyer – Circuit Schematic
Electronic keyer
This circuit automatically produces Morse code dots and dashes set by time constants involving Cl and C2. Rl sets dot/dash ratio and R2 sets the speed...
Code practice oscillator – Circuit Schematic
Code practice oscillator
The circuit consists of a basic oscillator (above dashed line) and an automatic keyer (below dashed line)...
Digital theremin – Circuit Schematic
Digital theremin
The CD4069 or 74C04 hex inverter—is used as^ fixed-frequency oscillator centered around 100 kHz. U2 contains the variable frequency oscillator and balanc...
Safety flare – Circuit Schematic
Safety flare
When SI is on, power is applied to an oscillator composed of Ql, Rl, Cl, LI, and L2. Coil Ll is the primary winding of Tl, and L2 is the feedback winding. When ...
Staircase generator – Circuit Schematic
Staircase generator
Two CA3130's are used, one as a multivibrator and the other as a hysteresis switch. The third amplifier, a CA3160, is used as a linear staircase generator. ...
Three phase square-wave output generator – Circuit Schematic
Three phase square-wave output generator
This circuit gives a 3 phase square-wave output for a variable speed motor drive. Operation is straightforward, the 4017 counter is synchronously reset after si...
Line frequency square-wave generator – Circuit Schematic
Line frequency square-wave generator
With only three components and a buffer, a line frequency square wave having a 1:1 duty cycle may be derived from the power supply. During the alternate half-cy...
Phase tracking three-phase generator – Circuit Schematic
Phase tracking three-phase generator
Using a single chip LM324 can, with active R-C networks, reduce the size of a 3-phase waveform generator, and prove useful in compact and stable 3-phase inverte...
2MHz square-wave generator – Circuit Schematic
2MHz square-wave generator
With the values shown the circuit generates a 2-MHz symmetrical square wave. Changing capacitors Cl and C2 to 0.01 µ¥ results in a frequency of 500 Hz. ...