Micro amplifier (CB23733E)

This direct coupled amplifier using 3 transistors and low voltage power was found in the April 1961 Radio Electronics magazine.

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DC to AC converter (CB9668E)
This converter or inverter uses components that are still common. The transformer is the type...
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The integrated circuits used in this oscillator are not very common today, as we obtained it in...
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The circuit shown in the figure is sensitive to light. Its frequency is determined by the light...