volume 3, issue 5981, P467-467 1975
DOI: 10.1136/bmj.3.5981.467
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Abstract: The Detector Circuit Description.-Two transistors are used in a Darlington connection to provide a high gain. When the resistance between the input terminals Ti and T2 (see fig.) is lowered the transistor collector currents increase and one coil of the remanent relay RL is energized and opens both sets of contacts. The relay remains in this state even if the coil current returns to zero. The contacts RL2 are connected in series with the battery supply to an electric clock and contacts RL1 are connected in seri…

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