This circuit is from a Portuguese publication from 1979 but can be easily assembled with BC548 transistors and TIC106 type SCRs. Its purpose is to detect who tightens the electrodes the most, obtaining an indication of the effort on the meter with zero in the center of the scale and firing one of the SCRs when the maximum force is achieved by one of the competitors. For a 9 V supply, 6 V lamps can be used, as we have a voltage drop of 2 V in the SCRs.
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