1KHz Sinewave Generator

Simple circuitry, low distortion, battery operated Variable, low impedance output up to 1V RMS

Circuit diagram

Parts:

• R1 5K6 1/4W Resistor
• R2 1K8 1/4W Resistor
• R3,R4 15K 1/4W Resistors
• R5 500R 1/2W Trimmer Cermet
• R6 330R 1/4W Resistor
• R7 470R Linear Potentiometer
• C1,C2 10nF 63V Polyester Capacitors
• C3 100µF 25V Electrolytic Capacitor
• C4 470nF 63V Polyester Capacitor
• Q1,Q2 BC238 25V 100mA NPN Transistors
• LP1 12V 40mA Lamp (See Notes)
• J1 Phono chassis Socket
• SW1 SPST Slider Switch
• B1 9V PP3
• Clip for 9V PP3 Battery

Circuit description:

This circuit generates a good 1KHz sinewave using the inverted Wien bridge configuration (C1-R3 & C2-R4). Features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament lamp ensures a stable long term output amplitude waveform. Useful to test the Audio Millivoltmeter, Audio Power Meter and other audio circuits published in this site.

Notes:

• The lamp must be a low current type (12V 40-50mA or 6V 50mA) in order to obtain good long term stability and low distortion.
• Distortion @ 1V RMS output is 0.15% with a 12V 40mA lamp, raising to 0.5% with a 12V 100mA one.
• Using a lamp differing from specifications may require a change in R6 value to 220 or 150 Ohms to ensure proper circuits oscillation.
• Set R5 to read 1V RMS on an Audio Millivoltmeter connected to the output with R7 fully clockwise, or to view a sinewave of 2.828V Peak-to-Peak on the oscilloscope.
• With C1,C2 = 100nF the frequency generated is 100Hz and with C1,C2 = 1nF frequency is 10KHz but R5 is needing adjustment.
• High gain transistors preferred for better performance.

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Tri Waveform Generator

The Tri-Waveform Generator can be used for a number of different uses. The one that I use it for is a signal generator to test circuits. The frequency range is 20 to 20khz. and can be adjusted by R1. The duty cycle or the time that the waveform is high and the time that the waveform is low can be adjusted by R4. The purpose of R2 and R3 are to clean up any distortion on the sine wave output. To do this you must hook up the sine wave output to and oscilloscope and adjust R2 & R3 to make the sine wave as accurate as possible.

Source by : Streampowers

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Alternating Square Pulse Generator

The generator circuit was designed to produce alternating square pulses with vibrations in different parts of the circuit.

4027 – a dual JK flip flop that has independent clock, set, and reset inputs for each flip flop used in toggle, register, and control functions due to its features such as capability of driving two low power TTL loads, logic edge clocked flip flop design, logic swing independent of fanout, toggle rate of 3 MHz at 5 Vdc, supply voltage range of 3 V to 6 V, protection of diodes on all inputs, noise immunity, and quiescent current of 2 nA at 5 Vdc. 4001 – a quad 2-input NOR gate integrated circuit, generally characterized by small fluctuation in voltage supply, very high impedance, outputs that can sink and source, one output can drive up to 50 inputs, high speed gate propagation time, high frequency, and low power consumption.

Alternating Square Pulse Generator Circuit Diagram

BC550 – an NPN general purpose transistor with low current and low voltage used for low noise stages in audio frequency equipment

The generator functions without distortion when it reaches 100 KHz. The square pulses are produced when the selector switch S1 is turned ON, which matches the output of Q3 at pin 7. The 5V pulse line is applied to J1 input, the signal is fed to T-flip flop IC1A through S2 which creates pulses indicated at half of the duration time where pin 2 handles the division of pulse frequency. The pulses are applied to IC2 pin 14 and IC3A input. IC2 acts as decimal counter with decode outputs where each entry produces HIGH on one of the outputs. From the initial pulse entry, the output of Q1 becomes HIGH while others are LOW. The second pulse entry causes HIGH output on Q2, and third entry applies on Q3. The same operation occurs for the succeeding pulse line entry, since the counter checks the number of pulses that passes the generator output.

The generator output stage is considered on levels where the driving stage of Q2 creates positive output voltage and the saturation of Q 3 in the cutoff region. Through the potentiometer, the signal is applied in the output of J2. Using the gates of IC3B-C-D, the sine wave or triangular wave can be changed to square pulses in the circuit input. The conversion is directly made from the command of S2. The switching can also be done by DIP switch S2. A suitable power supply or two NiCd batteries can maintain the circuit with the stabilization of voltage achieved by two Zener diodes.

R1-10= 10Kohm
R2= 47Kohm
R3= 22Kohm
R4-5= 18Kohm
R6-7= 4.7Kohm
R8= 1.2Kohm
R10= 100Kohm
R11-13= 470 ohm
R12= 1.5Kohm RV1= 1.2Kohm linear pot.
C1= 15pF ceramic
C2-3= 10nF 63V MKT
C4-5= 470uF 16V
C6= 1uF 63V MKT
D1-2= 5.1V 0.5W zener
D3-4= 1N4148
Q1-2= BC560C
Q3= BC550C IC1= 4027
IC2= 4027
IC3= 4001B
S1= switch DIL 10S
S2-3= 2X2 mini switch
LD1= LED
BATT= 9V Battery NiCd

The generation of square pulses can bring about plenty of usages by adjusting the input in digital circuits and controlling the frequencies of amplifiers, loudspeakers, rooms of hearings, and others. One popular application is in the camera flash temporal profile where square pulses act as a heating source in the photoflash technique. The amount of light emitted by an electronic flash is controlled by the shunted output of a pulse generator known as tailbiters where longer pulses are made with the biting off the tail of the impulse.

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Simple IF Signal Generator

Here is a versatile circuit of IF signal generator which may be of interest to radio hobbyists and professionals alike.Transistors T1 and T2 form an astable multivibrator oscillating in the audio frequency range of 1 to 2 kHz

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1KHz Sinewave Generator

Simple circuitry, low distortion, battery operated Variable, low impedance output as a lot as 1V RMS

Circuit diagram

Parts:

• R1 5K6 1/4W Resistor
• R2 1K8 1/4W Resistor
• R3,R4 15K 1/4W Resistors
• R5 500R 1/2W Trimmer Cermet
• R6 330R 1/4W Resistor
• R7 470R Linear Potentiometer
• C1,C2 10nF 63V Polyester Capacitors
• C3 100µF 25V Electrolytic Capacitor
• C4 470nF 63V Polyester Capacitor
• Q1,Q2 BC238 25V 100mA NPN Transistors
• LP1 12V 40mA Lamp (See Notes)
• J1 Phono chassis Socket
• SW1 SPST Slider Switch
• B1 9V PP3
• Clip for 9V PP3 Battery

Circuit description:

This circuit generates a excellent 1KHz sinewave the utilization of the inverted Wien bridge configuration (C1-R3 & C2-R4). Features a variable output, low distortion and low output impedance in order to get maintain of good overload capability. A small filament lamp ensures a steady long term output amplitude waveform. Useful to test the Audio Millivoltmeter, Audio Power Meter and different audio circuits published in this website online.

Notes:

• The lamp should be a low current kind (12V 40-50mA or 6V 50mA) to be able to receive excellent long term stability and low distortion.
• Distortion @ 1V RMS output is zero.15% with a 12V 40mA lamp, raising to zero.5% with a 12V 100mA one.
• Using a lamp differing from specifications may require a transformation in R6 worth to 220 or one hundred fifty Ohms to make certain right kind circuits oscillation.
• Set R5 to learn 1V RMS on an Audio Millivoltmeter related to the output with R7 totally clockwise, or to view a sinewave of two.828V Peak-to-Peak on the oscilloscope.
• With C1,C2 = 100nF the frequency generated is 100Hz and with C1,C2 = 1nF frequency is 10KHz however R5 is wanting adjustment.
• High acquire transistors most popular for better performance.

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