Electronic Ballast : Ballast Electronic

Telephone User Display

Telephone User Display: This circuit LED 1 show when we used the Telephone both call out and call in .This circuit used little device the telephone



Figure 1. Schematics of Telephone User Display

Data Sheet :

2N3819
The 2N3819 is a low-cost, all-purpose JFET which offers good. performance at mid-to-high frequencies


Telephone
The telephone is a telecommunications device which is used to transmit and receive sound (most commonly speech