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Circuit diagrams .. Electronics

Circuit diagrams

It is possible to draw electronic equipment, its components and connections to a scale identical to what these devices contain. However, it is always preferable to use circuit diagrams, in which its various components are represented by simple and easy symbols that are enough to compare them to become very familiar and easy to identify. The wires are represented by lines that may be connected to each other (137), and may intersect without touching (b). As for the points at the end of these lines (37c), they represent connection points, as in the socket, which can be connected or disconnected, and they can also be used for other purposes.

Figure (38) shows the symbol of a fixed resistor with three resistors in a small part of the circuit. Figures (139) and (39b) show. If the connections are taken from point S to a variable resistor point P, moving the sliding contact (arrow) to the right increases the value of the resistance entering the circuit. Small-value resistors are made of wires, while large resistors are made of carbon. The resistance wire may be in the form of a semicircle, in which case the contact is moved by turning a certain leg (39c). Figure (39d) shows this same variable resistor in its natural form. The variable resistors shown in Figures B, C, and D are usually called voltage meters. If we have a signal voltage at an audio frequency, and this signal is connected between points S and Y, it is possible to obtain any value of the voltage of this signal and control the volume level in a gradual manner by moving the sliding contact connected to point P, as in the volume control switch.

Switches

Figure (40) shows a disconnect-connect switch that may be a hinge switch or a low-voltage rotary switch or any other combination The volume control usually includes a switch, such as a regular on-off switch, or a double-pole on-off switch (with two poles) used to operate two circuits at the same time. The rotary switch in Figure 40 has a contact that can move the circuit to three positions 1, 2, 3. It is a switch with a single contact that moves between three positions and is called a single-pole, three-way switch. The switch may have more than one pole and more than one path according to the need.

37 - Representation of the different connections with drawings.
38 - Resistors.
39 - Variable resistors and potentiometer.
40 - Representation of switches with drawings.