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Electronic Circuit Build
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Engineering & Manufacturing > Electrical

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The client has made the following changes to the job.


Job canceled.

Oct 24, 2012

Job Description

  |  Change History >>


  • Posted: Wed, Oct 10, 2012
  • Time Left: Closed
  • Location: United States
  • Client prefers freelancers from:
    United States

    You are still able to submit a proposal for this job.

    The client prefers freelancers from
    a different location.

    You're still able to submit a proposal for this job, regardless of your location.
  • Start: Immediately
  • Budget: Not Sure
  • Fixed Price Job
  • Elance Escrow Protection
  • U.S. freelancers must have W9
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The following is a predesigned circuit that I would to have done and the shown box below.

Project Description:

The chip is known as the "8038" (originally made by Intersil, and now produced by several companies) and provides a reasonably clean sinusoidal output as well as triangle and square waves. The output frequency is set by a few external components. Another similar chip is the Exar XR2206, which has a little better stability and cleaner waveform than the 8038, but is harder to find. We will use the 8038.

I would prefer the Exar XR2206

The figure mfd_ckt shows 8038 signal generator circuit. This is a very standard configuration given in the Intersil data sheet. The output frequency is set by R1 and C1 (plus C2) to be approximately f=0.15/(R1*C1). The sine wave output at pin 2 is then fed through an R-C low-pass filter (R4-C3) to the LM386 audio amplifier. Figure 2 shows the PC board for this circuit. Note that the PC board includes some extra pads for opti...

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Job ID: 34216937
Avg $ | High $ | Low $ — Show Pricing
  • Submit Date (Latest)

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Proposal SEALED

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David L.      
David L.'s identity has been verified.  Learn More
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