Circuit for an automatic firing device

摘要

An automatic firing device contains, inter alia, three time transmitters and a flame-relay amplifier. The second time transmitter (3) has at its output an auxiliary-relay semiconductor switch (21) which is driven by a preamplifier (33). The input of the preamplifier (33) is on the one hand connected via a resistor (R5) to in each case one supply pole of the preamplifier (33) and of the second time transmitter (3) and, on the other hand, is connected via a first diode/resistor series circuit (D4; D5; R6) to the other supply pole of the preamplifier (33) and of the second time transmitter (3) as well as to one pole of the auxiliary-relay semiconductor switch (21). The input of the preamplifier (33) is also additionally connected via an RC series circuit (R8; C2) and a downstream second diode/resistor series circuit (D6; R7) to an AC voltage input pole (3c) of the second time transmitter (3), the pole of the RC series circuit (R8; C2) which is averted from the preamplifier (33) being connected to earth via an input semiconductor switch (T1) whose control input forms a first input (3a) of the second time transmitter (3). In the stated sequence, starting from the input of the preamplifier (33), the first diode/resistor series circuit (D4; D5; R6) consists of two series-connected diodes (D4, D5) and a further resistor (R6), the two diodes (D4, D5) being connected in the same polarity, and the common pole of the two diodes (D4, D5) ÄlacunaÜ via a further ... Original abstract incomplete. <IMAGE>