Patent GB-965920-A (GB)
Title: Electric analogue computer
IPC: G06G7/06
Filed: 1961-05-19
Abstract: 965, 920. Electric analogue calculating. TESLA, NARODNI PODNIK. May 19, 1961 [May 26, 1960], No. 18318/61. Addition to 955, 098. Heading G4G. [Also in Division H1] An electric analog computer of the kind described in the parent Specification has a main program board which carries further plug sockets electrically connected to input and output terminals of nonlinear computing elements, and also carrying one or several pairs of plug sockets connected to positive and negative poles of a voltage source or sources together with pairs of plug sockets arranged so that one of a pair is connected to a terminal of a coefficient setting potentiometer whose other terminal is earthed, and the other plug socket of the pair is connected to the potentiometer slider. In Fig. 1 the main program board 2 comprises for each operational amplifier 3A 10 , 3A 12  &c. a range of interconnected input plug sockets 21a to e and interconnected output sockets 21f, while the face of the board is engraved with symbols representing the amplifiers and their socket connections, and is of such material as to accept temporary pencil markings. Other plug sockets M 1  to M 9  are provided in multiple along the board and interconnected in groups corresponding to their suffixes, while plug sockets R 10 , R 12 , R 20 , R 22  &c. are connected to the inputs of coefficient setting potentiometers returned to earth. Sets of plug sockets U, V are spacedly disposed along the board and connected to inputs and outputs of non-linear computing units, and sets of plug sockets A, B, E similarly disposed are connected to positive and negative voltage sources and to earth. Any convenient number of operational amplifiers may be similarly arranged in sequence along the board and interconnected at will using the various plug sockets and their interconnections. Computing impedances e.g. LCR units disposed elsewhere in the system may be connected as required to the inputs and outputs of the amplifiers over the sockets 21a to e and f. In Fig. 2 (not shown) the interconnecting wiring of the amplifiers, voltage sources, and plug sockets is set forth with amplifier 3A 10  idling and amplifier 3A 12  connected with an input series resistor and a feedback loop resistor returned to its input. Non- linear computing units connected to U, V may comprise a diode voltage limiter (Fig. 3) whose input U is connected over opposed bias sources Z 1 , Z 2  and direct to potentiometers P 1 , P 2  whose sliders are connected through oppositely poled diodes D 1 , D 2  to output V so as to limit the input voltage in both polarities to values set by Z 1 , Z 2 . Diode multipliers switching circuits, and function generators may be utilized to introduce e.g. functions Œ x2, Œ x<SP>3</SP>, Œ sin x. Any convenient number of amplifiers, limiters, and function generators may be disposed along the board with suitably disposed interconnection plug sockets, which may be arranged to introduce any desired feedback loop into the amplifiers. The plug sockets may be disposed with regular displacements inter se so that standard U-plugs may be used for interconnection. Alternative exchangeable plug boards may be used with plugs and sockets in the connections to the body of the apparatus, so that a given computing network may be set up therein and the board removed for storage and future use. The board may be square shaped with the sockets concentrated in a central group. In Fig. 4 (not shown) a typical interconnection of amplifier, input and feedback resistors, and current limiter is set forth. The amplifiers may be transistorised.