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CAT # SGM-1 4 out of 5 stars(1 Review) Write a Review

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$ 9.50
$9.50 each
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Product Description
• Built on ICL8038 IC
• Triangular, square and sine wave output
• Power: 12-15Vdc
• Footprint: 59 x 44mm

Note: If you would like to put this together yourself we have it in a kit, see our CAT# KT-SGM.
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews 4 out of 5 stars(1 Review)

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Some Caveats 4 out of 5 stars

Reviewer: from Colorado Springs CO

Nota Bene: The two boards I assembled were bought the last time these were available. The newly available batch may not have the same issues.

One kit was missing a 103 cap. (Stuff happens.)

The circuit board mask calls out a 100uF electrolytic (C5) on the positive supply rail but parts list & parts in kits were 220uF - not a problem, per se.

However, the parts list called out 16v for C5 but my kits contained 10v. There can be a problem there. All Electronics ad says usable supply is 12 - 15 volts & kit instructions cite a 12v supply. A reversed-polarity protection diode (D1) drops the supply voltage a little (~.7 v) off the postive supply input but with a 12v supply that's skating C5 on thin ice for an electrolytic of only 10 working volts. You can see why parts list called for 16v. I replaced the kit cap with a 220uF 35v cap.

Harris & Intersil 8038 data sheets say typical single-ended Vcc supply minimum is 10v. I tried 9v & 18v & both worked w/only differing output levels. TRI & SIN wave amplitudes are well below the SQU wave output (that's a chip feature).

The chip has Hi-Z outputs & will NOT drive any sort of load like a speaker. Even a 10K ohm resistor pulled down the output amplitudes & distorted the sine wave.

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