Mrunal Ahirrao
Full Member level 2
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hi all,
Actually I am making a DTMF based appliance controller. But I am having a problem in Relay. I have used Electromechanical relay. problem is when 8870 gives output to relay it doesn't switched on! So I thought might be current is less provided by 8870. So iadded transistor between relay and IC. but then also its not. When I measured voltage across relay its 1.94V. and when i remove the IC's output to relay and measured on transistor then its 5V and again if I attach relay to transistor then again voltage drops from 5V to 1.94 V! How this is happening? please help.
Actually I am making a DTMF based appliance controller. But I am having a problem in Relay. I have used Electromechanical relay. problem is when 8870 gives output to relay it doesn't switched on! So I thought might be current is less provided by 8870. So iadded transistor between relay and IC. but then also its not. When I measured voltage across relay its 1.94V. and when i remove the IC's output to relay and measured on transistor then its 5V and again if I attach relay to transistor then again voltage drops from 5V to 1.94 V! How this is happening? please help.