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Fundamental-frequency-crystal-oscillator – Circuit Schematic
Fundamental-frequency-crystal-oscillator
For frequencies below 20 MHz, a fundamental-frequency crystal can be used and the resonant tank is no longer required. Also, at this lower frequency range the ...
Pulse-train-to-sinusoid-converter – Circuit Schematic
Pulse-train-to-sinusoid-converter
The circuit letsyou convert a serial pulse stream or sinusoidal input to a sinusoidal output at 1/32 the frequency. By varying the frequency of Vrn, you can ac...
Square·-to-sine-wave-converter – Circuit Schematic
Square·-to-sine-wave-converter
Two pairs of MOSFETs form a bridge that alternately switches current in opposite directions. Two parallel-resonant LC circuits complete the converter. The Ll/C...
20Mhz-clock-phase-lock – Circuit Schematic
20Mhz-clock-phase-lock
The 20-MHz clock phase-locks to Apple"s Mac II 10-MHz NuBus clock. It uses a simple, inexpensive CMOS circuitry to generate 10-and 20-MHz square waves. The out...
Wide-frequency-ttl-clock – Circuit Schematic
Wide-frequency-ttl-clock
This free-running TTL square-wave oscillator has a variable frequency output over a 20:1 range or better through use of four of the six inverters in an SN7404 ...
Single-op-amp-clock – Circuit Schematic
Single-op-amp-clock
Capacitor C1 is charged through timing resistor R1 when the clock output is high. When C1 reaches the upper threshold voltage, the output signal decreases, a...
Oscillator-clock-generator – Circuit Schematic
Oscillator-clock-generator
This self-starting fixed-frequency oscillator circuit gives excellent frequency stability. R1 and C 1 comprise the frequency-determining network, while R2 pr...
Tone-burst-generator – Circuit Schematic
Tone-burst-generator
Most European repeaters must be brought up with a 1750-Hz tone. The SK3733 (also known as an ECG1197) IC contains a crystal oscillator and is divided by -256, ...
Clock source – Circuit Schematic
Clock source
A clock source using LM311 voltage comparator in positive feedback mode...
Digitally-controlled oscillator – Circuit Schematic
Digitally-controlled oscillator
The microprocessor-controlled oscillator has a 8159 to 1 frequency range covering 2 Hz to 20 kHz. An exponential, current output IC DAC functioning as a program...
Variable audio oscillator 20hz to 20Khz – Circuit Schematic
Variable audio oscillator 20hz to 20Khz
To obtain a 1000:1 Sweep Range, the voltage across external resistors Ra and Rb must decrease to nearly zero. This requires that the highest voltage on control ...
50Khz oscillator – Circuit Schematic
50Khz oscillator
A 50 kHz circuit is possible because of the more nearly ideal characteristics....
10Khz oscillator – Circuit Schematic
10Khz oscillator
The capacitor charges until switching voltage is reached. When SUS switches on, the inductor causes current to ring...
Strobe-tone burst generator – Circuit Schematic
Strobe-tone burst generator
With a dual supply voltage, the external capacitor on pin 10 can be shorted to ground to halt the 8038 oscillation...
Adjustable function generator – Circuit Schematic
Adjustable function generator
This low-cost operational-amplifier circuit (A) generates four different functions with adjustable periods. For the components shown here, the period of the out...
Simple voltage controlled oscillator – Circuit Schematic
Simple voltage controlled oscillator
With the component values shown, the oscillator has a frequency of 8 kHz. When an input signal is applied to the base of Ql the current flowing through Ql is va...
Voltage controlled oscillator – Circuit Schematic
Voltage controlled oscillator
The VCO circuit, which has a nonlinear transfer characteristic, will operate satisfactorily up to 200 kHz...
Precision oscillator – Circuit Schematic
Precision oscillator
RC 4151 precision voltage-to-frequency converter generates a pulse train output linearly proportional...
Precision voltage controlled oscillator – Circuit Schematic
Precision voltage controlled oscillator
The linearity of input sweep voltage versus output frequency is significantly improved...
Ultrasonic pest repeller – Circuit Schematic
Ultrasonic pest repeller
The device emits ultrasonic sound waves that sweep between 65,000 and 25,000 hertz. Designed around a 556 dual timer, one half operated as an astable multivibra...