Hold function for Telephone

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       +-------+------+      R1 = 2.2K 
       |       |      |      R2 = 1 K 
     -| SW     R      |      R3 = 47 ohms 
       |       1      |      SCR = 2N5064, TIC47, or MCR104 
       |       |      | 
       R      LED     |               Well, that's it, just remember that 
       2       |      |               the cathode of both the SCR and the 
       |       |      +- RING (Red)   LED are towards the bottom. 
       +------SCR 
       |       |      +- TIP (Green) 
       R       |      | 
       3       |      | 
       |       |      | 
       +-------+------+ 

Sources

  • figment[at]wam.umd.edu

Category:Telephone

 

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