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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 rang...
Simple 555 Vco – Circuit Schematic
Simple 555 Vco
The VCO has an output frequency that ranges from 1500Hz at V;,= 1 V to 300Hz at V;,=5 V. R1 or C1 can be varied to change th...
Gated Wide-Range Vco – Circuit Schematic
Gated Wide-Range Vco
A CD4046 can be gated either with a switch or electronically, as shown in the figure. Frequency range of this circuit ...
Simple Audio-Frequency Vco – Circuit Schematic
Simple Audio-Frequency Vco
The frequency of this sine-wave oscillator is determined by a direct voltage, U" of 0 to 15 V. The distortion on...
Ultrasonic Pest Repeller I – Circuit Schematic
Ultrasonic Pest Repeller I
An NE555 timer is used to generate an ultrasonic signal in the 20- to 65-kHz range. The speaker is a small piezo...
Ultrasonic Sound Source – Circuit Schematic
Ultrasonic Sound Source
Using two NE555 timer IC devices, this circuit generates either pulsed or continuous ultrasonic signals. The value...
1Khz Square-Wave Generator – Circuit Schematic
1Khz Square-Wave Generator
When the output is high, R3 and R4 are in parallel, and CI charges via Rl until the current in R2 equals that a...
Basic Multivibrator – Circuit Schematic
Basic Multivibrator
When this circuit is turned on, the natural offset of the devices serves as an automatic starting voltage. Assume that ...
4-Decade Square-Wave Generator – Circuit Schematic
4-Decade Square-Wave Generator
This circuit will generate a square wave of 2 Hz to 20 kHz. The circuit uses an op amp in a relaxation-oscil...
Square-Wave Generator – Circuit Schematic
Square-Wave Generator
This relaxation oscillator circuit uses diodes to produce charge and discharge paths for CI. The duty cycle is set vi...
Variable Duty-Cycle Square-Wave Generator – Circuit Schematic
Variable Duty-Cycle Square-Wave Generator
CI alternately charges via Rl/Dl and the upper half of R5, and discharges via R1/D2 and the lower...
Square-Wave Oscillator – Circuit Schematic
Square-Wave Oscillator
The NE555 is connected in the astable mode and uses only three timing components (RA, RB, and Ct. A 0.01-/aF bypass ...
Whooper – Circuit Schematic
Whooper
Integrated circuit Ul is connected as a low-frequency asymmetrical oscillator. Its output is inverted by Ql and fed to the reset te...
"Hee-Haw" Electronic Siren – Circuit Schematic
"Hee-Haw" Electronic Siren
The oscillator based on IC2 is responsible for producing the sound. Its output is connected to the base of TRl, ...
Wien-Bridge-Based Oscillator With Very Low Distortion – Circuit Schematic
Wien-Bridge-Based Oscillator With Very Low Distortion
This complex oscillator circuit uses a photocell and common-mode-suppression circuitr...
Sine- And Square-Wave Ttl Oscillator – Circuit Schematic
Sine- And Square-Wave Ttl Oscillator
Using a Quad NAND Gate, the TTL oscillator can use fundamental crystals between 1 and 10 MHz. The sine...
Phase-Shift Oscillator For Audio Range – Circuit Schematic
Phase-Shift Oscillator For Audio Range
This phase-shift oscillator is useful for audio oscillator applications. Adjust R7 for a good sine w...
Three-Decade 15Hz To 15Khz Wien-Bridge Oscillator – Circuit Schematic
Three-Decade 15Hz To 15Khz Wien-Bridge Oscillator
In this circuit, an LM741 op amp drives a Wien-bridge network using two zener diodes as...
Low-Frequency Lc Oscillator – Circuit Schematic
Low-Frequency Lc Oscillator
Basically a Hartley oscillator using a triple-emitter follower, this oscillator can be used at audio and low ra...
Very Low Distortion Oscillator – Circuit Schematic
Very Low Distortion Oscillator
This oscillator uses a bridge circuit with an optoisolator as a gain-control device. The resultant distortio...