Thermometer (CB19856E)

The sensors and integrated circuit used in this circuit are uncommon today. However, it is worth the configuration for the purpose of consultation.

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Neon mains voltage indicator (CB23772E)
This circuit was obtained from a Radio Electronics in May 1967. The circuit consists of a system...
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This simple two-transistor capacitance meter uses a 50 uA microammeter as an indicator instrument. The...
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Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...