Iam planning to do a experiment using two telephones of Pulse Dialing.

Telephone No.1

Telephone No.2

Now this may sound out of topic as this is total hardware question ...

1) For both telephones two SLIC circuits will be made.

2) Each SLIC will have the following:-

i) 5 volts Relay connected with telephone set , C945 Transistor , A673 Transistor and a diode for protecting relay indicator.


3) Power supply will be of 24 Volts using 7824 , 7805.

Please just tell me if i need any thing esle for connecting two sets.