Simple Loudspeaker Circuit For Telephone Circuit Diagram
This below circuit is a easy handsfree telephone receiver system. This doesn’t have dialing circuit so, it’s not a total phone replacement circuit, but it’s just only a loudspeaker system (i.e, phone receiver,not dialer). This is a easy circuit with all parts easily available, and without any complex I.C. It is made of just capacitors, diodes, resistors, and transistors. This circuit can be made within 70 rupees and it compromises of the following sections Loudspeaker Circuit For Telephone Circuit Diagram Power rectifier and filter section This section is made of a simple bridge rectifier and a indicating power LED. Voltage regulator section This section is made upon transistor Sl100, which is a general purpose NPN transistor in metal package. That is used to regulate voltage at a level of 9+0.6=9.6V by a 9V zener diode. Speaker output section This section contains a high impedance speaker and two BC548 NPN transistor to ampl...