Noise generator
The zener breakdown of a transistor junction is used as a noise generator. The breakdown mechanism is random and this voltage has a high source impedance. By us...
Astable oscillator
Before power is applied, the input and output are at ground potential and capacitor C is discharged. On power-on, the output goes high (Vdd) and C charges throu...
Astable multivibrator
The capacitor C will charge through Ra and Rb, and then discharge through Rb only...
Pulse-position modulator
The threshold voltage, and thereby the time delay, of a free-running oscillator is shown modulated with a triangular-wave modulation signal...
Active inductor
An active inductor is realized with an eight-lead IC, two carbon resistors, and a small capacitor...
Sight n sound metronome
Precise, adjustable control of beats per minute from a largo of 18 to a frenzied, high presto of 500, These beats are produced acoustically through a speaker. A...
Accentuated beat metronome
IC3 acts as an oscillator which operates if the output of ICl is high. With the values used the two frequencies produced are about 800 Hz and 2500 Hz. The outpu...
Beat frequency indicator
This circuit uses LEDs to display the beat frequency of two-tone oscillators. Only one LED is on at a time, and the apparent rotation of the dot is an exact ind...
Flasher-light control
The circuit is a two-stage, direct-coupled transistor amplifier connected as a free-running multivibrator...
Neon blinker
The universal output transformer and the transistor form a low-frequency oscillator...
Dualxed cmos flasher
Inverters ICl-a and ICl-b form a multivibrator and ICl-c is a buffer. Inverter ICl-d is connected so that its output is opposite that of ICl-c; when pin 6 is hi...
Flip-flop flasher
The flashing action is provided by a simple astable multivibrator timed to give a flashing rate of about 60 flashes for each lamp per minute. Circuit for positi...
Frequency divider
Spikes in the center of a sawtooth wave are eliminated in this circuit...
Pierce harmonic oscillator 100Mhz
Current meter ranges from 100 pA to 3 mA full scale. Voltage across input is 100 µV at lower ranges rising to 3 mV at 3 mA. The buffers on the op amp are to ...
Jfet pierce crystal oscillator
The JFET Pierce crystal oscillator allows a wide frequency range of crystals to be used without circuit modification...
Stable low frequency crystal oscillator
This Colpitis-crystal oscillator is ideal for low frequency crystal oscillator circuits...
Ttl-compatible crystal oscillator
Adjust Rl for about 2 volts at the output of the first gate...
International crystal oscillator
International Crystal OF-1 HI oscillator circuit for third-overtone crystals...
Parallel-mode aperiodic crystal oscillator
The crystal is placed between the collector of the output stage and the base of the input stage. The frequency of oscillation can be set to a precise value with...
Butler aperiodic oscillator
This circuit works well in the range of 50 kHz to 500 kHz. Slight component modifications are needed for higher frequency operation...