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Astable multivibrator IIV – Circuit Schematic
Astable multivibrator IIV
The circuit with independent control of "ON" and "OFF" periods uses the CA3130 BiMOS op amp for filters, oscillators, and long-duration timers....
Cmos 555 astable generates square waves – Circuit Schematic
Cmos 555 astable generates square waves
A CMOS timer generates true square waves because, unlike the bipolar 555, its output swings from rail to rail....
Oscillator with frequency doubled output – Circuit Schematic
Oscillator with frequency doubled output
The current-controlled oscillator frequency can be doubled by applying a portion of the square-wave output at pin 5 back to the input at pin 3, as shown....
Low frequency TTL oscillator – Circuit Schematic
Low frequency TTL oscillator
This oscillator uses standard inverters, one resistor and one capacitor, and has no minimum operating frequency. R and C must be chosen such that currents into ...
Bird chirp – Circuit Schematic
Bird chirp
For a barking dog, the capacitor at pin 17 is changed to 15 pF to increase the frequency of the VCO. ...
Electronic bongos – Circuit Schematic
Electronic bongos
This circuit consists of twin-T sine-wave oscillators. Each oscillator has a filter in the feedback loop. If the loop gain is greater than unity, the circuit wi...
Frequency warning alarm – Circuit Schematic
Frequency warning alarm
Low frequency oscillator (Ql) modulates high frequency oscillator Q2 and its associated timing capacitor. ...
Hee-haw – Circuit Schematic
Hee-haw
The circuit uses two gates of a 7400 IC cross-connected to form an astable multivibrator driven by the 1-pulse per second output of the digital clock IC. The he...
Yelp oscillator – Circuit Schematic
Yelp oscillator
Close the pushbutton switch and the circuit starts the siren up-shifting to a higher frequency. ...
Toy siren – Circuit Schematic
Toy siren
This circuit can be built small enough to frt inside a toy. The circuit consists of a relaxation oscillator utilizing one unijunction transistor (2N2646, MU10, ...
Warbling tone generator – Circuit Schematic
Warbling tone generator
The circuit use two unijunction transistors. The low-frequency sawtooth generated by Ql modulates the high-frequency tone generated by Q2....
Tone generator – Circuit Schematic
Tone generator
The circuit uses a pair of 555 timers or a single dual timer. Capacitor Cl controls the speed of the warble, while C2 determines the pitch....
two-tone generator – Circuit Schematic
two-tone generator
Two 741 operational amplifiers are used for the active element in this Wien bridge oscillator. (The 1458 is the dual version of the 741.) Frequencies of the two...
Adjustable sine-wave audio oscillator – Circuit Schematic
Adjustable sine-wave audio oscillator
Lamp LI stabilizes the loop gain at higher frequencies while the limiting action of R2, CRI, and CR2 prevents clipping at low frequencies and increases the fre...
RC audio oscillator with 555 – Circuit Schematic
RC audio oscillator with 555
Transistor Q5 and the 1000 ohm resistor form the variable element needed for controlling the frequency of VCO by limiting the charging current flowing into the ...
Oscillator produces audio sinusoids – Circuit Schematic
Oscillator produces audio sinusoids
By placing a tuned circuit in the UJT oscillator's current-pulse path, a 3750-Hz sinusoid can be created at B2 with the component values shown. ...
Wien bridge oscillator – Circuit Schematic
Wien bridge oscillator
In the circuit the frequency trimming component is arranged so that the voltage across it is in quadrature with the voltage V0 from the bridge so that as it is ...
Audio sine-wave generator – Circuit Schematic
Audio sine-wave generator
U1A, an op amp, oscillates at the frequency at which the phase shift in the Wien bridge network is exactly zero degrees. Changing bridge component values change...
Audio oscillator – Circuit Schematic
Audio oscillator
A Wien bridge oscillator produces sine waves with very low distortion level. The Wien bridge oscillator produces zero phase shift at only one frequency (f = Vx ...
5Mhz vfo – Circuit Schematic
5Mhz vfo
A JFET (Ql) serves as the oscillator. D2 helps to stabilize the transistor by limiting positive sinewave peaks and stabilizing the bias. Output from Ql is suppl...