Scanner for Preamplifier

Scanner for Preamplifier

The scanner is an extension for 0 1 1 the ‘All-solid-state preamplifier’ published in Elektor Electronics* As its name implies, it scans all inputs of the preamplifier to ascertain where there is an audio signal present. That input re-mains selected. After there has been no signal for some time, scanning is resumed. The scanning action[…]

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Remote Temperature Sensor

Remote Temperature Sensor for Digital Multimeters

National Semiconductor’s LM334Z is a temperature-dependent adjustable current source supplied in a plastic TO-92 package. In Fig.  a 226 Ω resistor, R1, is used to set a current gradient of 1 µA K-1. The remote temperature sensor is formed by IC1, R1 and C1. Since its output is a temperature-dependent current, a simple two-wire connection[…]

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