3-IC AD converter (CB9028E)

Found in American documentation from the 70s, this circuit uses components of the time, uncommon today.

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Programmed Gain Amplifier (CB24621E)
This circuit with the HA2400 was found in the March 1980 Radio Electronics magazine. The circuit has...
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Obtained from a 1980s Linear Technology documentation, this circuit has a hysteresis of less than...
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This circuit published in the November 1964 Radio Electronics magazine powers a light bulb but can...