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  • Stepped Timer (ART726E)
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Circuit Bench

  • Photoelectric alarm (CB23798E)

      This simple passage alarm is powered by the power grid using an LDR as a sensor. The circuit is...

  • Crystal radio (CB20903E)

      This crystal or galena radio uses a germanium diode. C1 is an old radio variable and L1 has 100...

  • Preamplifier with NE542 (CB1258E )

        This circuit is from the Philips manual of 1990. The integrated circuit is not very common. The...

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