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Category: Other Circuits / Game Circuits This circuit is also crossed to: Sensor Circuits Views: 568 Rank: 0 This circuit can detect whether a train in a particular drive. The output is TTL and CMOS compatible and can be processed by such a computer. The simple circuit works. The driving voltage is connected to the two terminals left. When the locomotive of the interrupted line is, the flow leading to the locomotive goes through the triac T1. This is then a voltage of about 1 V, which is conducting T3 or T4. Therefore, the LED D1 on and the output is logical zero. R1 = 22 kOhm Because two transistors and two diodes are used, the circuit works in both directions. When the stop input a high signal is presented, the gate of the triac shorted to ground. The line will be energized. This can be used as an emergency stop. R2 = 560 ? R3, R4 = 4.7 kOhm R5 = 330 ? D3 = LED D4 = 1N4148 T1, T3, T4 = BC 547B T2 = 206 TIC visit page.  R1 = 22 kOhm Because two transistors and two diodes are used, the circuit works in both directions. When the stop input a high signal is presented, the gate of the triac shorted to ground. The line will be energized. This can be used as an emergency stop. R2 = 560 ? R3, R4 = 4.7 kOhm R5 = 330 ? D3 = LED D4 = 1N4148 T1, T3, T4 = BC 547B T2 = 206 TIC http://www.circuitsonline.net/schakelingen/19/modelbouw/treindetectie.html
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