Oscillator Generator | Electronic Project Circuits

Posts Tagged ‘Oscillator generator’

Alternate 555 Oscillator

This is a slightly simpler circuit than the one above. The circuit uses just one resistor and one capacitor with the 555 timer IC to create a stable and reliable oscillator with an output that it a true squarewave.
The formula for calculating the frequency is:

f=1/(1.4*R*C).

The values in the formula are expressed in ohms, farads, seconds and hertz. This formula is much simpler than that of the previous circuit. With the values shown on the circuit, the frequency is calculated as 1050Hz, but like the previous circuit, this arrangement can operate at frequencies up to around 500kHz.
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Read More Source: http://www.geocities.com/electronics3456/555circuits.html
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Be the first to comment - What do you think? Posted by admin - April 26, 2008 at 10:16 am

Categories: Oscillator generator Tags: 555, Oscillator generator, squarewave oscillator

Low-Frequency Crystal Controlled Oscillator

The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the schematic of a circuit that will perform the task.

Unfortunately, there aren’t many such circuits in the technical literature currently available, and when found, they don’t always work as expected. A circuit that has been found to work at full satisfaction in the frequency range from 10 kHz to 500 kHz is illustrated in Figure 1.

Signal Generator by IC 8038

ICL8038 signal generator chip, manufactured by Intersil. An improved version, made by Exar corp. is available (XR8038A). It can be used to produce three types of waveforms, sine, square and triangle. The frequency, amplitude and duty cycle can be varied, and selection of waveform is done digitally. To further reduce the complexity, a 3-to-1 switch may be used in place of the digital selection circuitry. I made use of the digital selection mechanism because switches available on the market are prone to dirt accumulation and poor contact quality. Besides, the digital method is a lot cooler!
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Source: http://www.circuithut.com/index.php?/circuit/content/view/full/391
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