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Mosquito-repelling circuit – Circuit Schematic
Mosquito-repelling circuit
In the 555 oscillator circuit, adjusting R2 will provide output frequencies from below 200 Hz to above 62 kHz...
Ultrasonic bug-chaser – Circuit Schematic
Ultrasonic bug-chaser
Low-intensity ultrasonic sound waves in the 30-45 kHz frequency band repel insects and small rodents. The unit is designed to generate a swept square wave from ...
Tone dial generator – Circuit Schematic
Tone dial generator
The circuit requires a minimum of parts and uses a iow cost standard 379545-MHz television color-burst crystal...
Simple triangle-square wave oscillator – Circuit Schematic
Simple triangle-square wave oscillator
By making Rt variable it is possible to alter the operating frequency over a 100 to 1 range...
Cmos oscillator – Circuit Schematic
Cmos oscillator
Varying the 100 K pot changes the discharge rate of Ct and hence the frequency. A square wave output is generated...
Oscillator-clock generator – Circuit Schematic
Oscillator-clock generator
This self-starting fixed frequency oscillator circuit gives excellent frequency stability. Rl and Cl comprise the frequency determining network while R2 provide...
Square wave oscillator – Circuit Schematic
Square wave oscillator
This generator is operable to over 100 kHz. The low frequency limit is determined by Cl...
Adjustable TTL clock – Circuit Schematic
Adjustable TTL clock
Symmetry of the square-wave output is maintained by connecting the right side of R2 through resistor R3 to the output of the third amplifier stage. This changes...
TTL oscillator – Circuit Schematic
TTL oscillator
TTL inverter stages, Ul and U2, are cross-connected with a crystal Yl. A resistor in each stage biases the normally digital gates into a region where they opera...
Colpitts oscillator – Circuit Schematic
Colpitts oscillator
When calculating its resonant frequency, use C1C2/C1+C2 for the total capacitance...
2Mhz oscillator – Circuit Schematic
2Mhz oscillator
Miller 9055 miniature slugtuned coil; all resistors 1/4W 5%; all caps min...
Low distortion oscillator – Circuit Schematic
Low distortion oscillator
The 2N5485 JFET is capable of oscillating in a circuit where harmonic distortion is very low...
Single op amp oscillator – Circuit Schematic
Single op amp oscillator
This circuit has a Schmitt trigger and integrator built around one op amp. Timing is controlled by the RC network. Voltage at the inverting input follows the RC...
Injector-tracer – Circuit Schematic
Injector-tracer
The unit has a separate amplifier and oscillator section allowing them to be used separately if need be. The injector is a multivibrator running at 1 kHz, with ...
Signal injectoh-tracer – Circuit Schematic
Signal injectoh-tracer
The injector is a CMOS oscillator with period approximately equal to 1 x Cl x R2 seconds. The values are given for 1 kHz operation. Resistors R3 and R4 divide t...
0 to 360 phase shifter – Circuit Schematic
0 to 360 phase shifter
Each stage provides 0° to 180° phase shift. By ganging the two stages, 0° to 360° phase shift is achieved This circuit is under:, power supplies, ac dc dc d...
Beam sputter for oscilloscope – Circuit Schematic
Beam sputter for oscilloscope
The basis ofthe beam splitter is a 555 timer connected as an astable multivibrator. Signals at the two inputs are alternately displayed on the oscilloscope with...
Drawing circles on a scope – Circuit Schematic
Drawing circles on a scope
The circuit is that of a quadrature sine and cosine oscillator...
10.7Mhz sweep generator – Circuit Schematic
10.7Mhz sweep generator
This circuit is used to observe the response of an if amp or a filter...
Noise generator circuit – Circuit Schematic
Noise generator circuit
The zener diode is an avalanche rectifier in the reverse bias mode connected toiihe input circuit ofa wideband rf amplifier...