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EQUIPMENT_INTERFACE_PROTECTION

2016-09-24 08:03  
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EQUIPMENT_INTERFACE_PROTECTION
When circuit shown is used to transfer signal from one piece of equipment to another, desired signal passes with very little degradation. Component values can be chosen to make thyristor SCP1 latch at any desired voltage between A and B that is greater than 0V, blowing fuse F1 and giving desired protective isolation. On other side of circuit, SCR2 will latch and blow F2 when voltage exceeds limiting value set by diode D2 and zener D4. Zeners are 10-V CV7144, diodes are CV9637 small-signal silicon, resistors are 10K, capacitors are 0.047 μF, and thyristors are 2N4147.-S. G. Pinto and A. P. Bell, Thyristor Protection Circuit, Wireless World, Oct. 1975, p 473.