FUNCTION GENERATOR USING OPAMP
Part No: 80-230
Stock No: 2515-AB1
Image is for illustrative purposes only. Please refer to product description.
$12.95 CAD SAVE $3
You do not need a lot of money to have access to square, triangle or
sine waves in the audio range.
This simple kit uses four operational
amplifiers (op-amps) to deliver these waveforms in the 6 Hz to 7000 Hz
range. The sine wave is a pseudo sine wave produced by a very simple
wave shaping circuit.
The kit is constructed on a single-sided printed
circuit board (PCB). A pseudo or imitation sine wave is produced by a
wave shaping circuit. A diode is a non-linear device. As the potential
difference across it increases the current rises in the characteristic
way published in all textbooks. This circuit "joins together" this
characteristic curve to produce an approximation to a sine wave. two
diodes have been joined together as a series pair in order to provide a
higher amplitude than would be obtained using only a single diode. The
shape of the pseudo sine wave could be improved at any particular
frequency by filtering, but filtering will cause distortion at lower
frequencies and loss of amplitude at higher frequencies.
You can have
perfect sine waves at particular frequencies by switching in appropriate
filters at those frequencies. The sine wave is sensitive to loading and
must be buffered. It is also low in amplitude and needs amplification.
R9 & R10 set the gain of op-amp B by forming a voltage divider
between the source and the output. If the wave shape voltage is 1 volt
higher than the reference (at the non-inverting input) the op-amp
reduces the output voltage until the inverting input voltage set by the
divider is equal to the non-inverting voltage. The ratio of the values
of R10 to R9 give the gain. The gain here is about 2. Operates on 9vDC.
( Shipping Weight: 40 Grams )