| 摘要 |
Apparatus for protection and electronic relaying for control of locks by door-opening intercoms. The invention relates to the apparatuses of the "relaying" type which make it possible to relay inadequate intercom control to electromagnetically triggered locks and to protect them from improper operation. The device comprises a time-delayed relay "KA, K, P, C1, R1, C2" switching a high-value capacitance "C5" onto the terminal "B3, B5" supplied by a symmetric voltage doubler "D1, D2, C3, C4" via "D3" and the load resistor "R2" which limits the current to 0.1 amperes, in which the current is peak-limited to 48 volts by the zener "Z, R3", the whole is installed and wired on a printed circuit support linked to a terminal for a simple external connection, the whole having a small size in order to be easily concealed. Among the most advantageous applications of the invention may be quoted relaying and protection of intercoms, for controlling all electromagnetically triggered locks and all the electric locks with a mechanical memory of the control pulse. <IMAGE>
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