Have an existing Nutone LA-305WL doorbell. The 16 V AC from the doorbell button activates the LA-305 via an electronic circuit, most likely an opto coupler on the board. If I connect an external standard old ding-dong doorbell in parallel with the existing unit it causes the LA-305 to ring constantly. So I need to create a circuit that will isolate the old doorbell away from the LA-305 as every attempt to use relays and or bridge circuit continues to leak AC back into the LA-305 input and run the doorbell constantly.
My thought would be to use an AC opto coupler like the H11AA1 and its output to drive a 12 volt DC relay which in turn would send the 16 V AC to the external doorbell. I need only the front door for the external doorbell.
Any thoughts would be appreciated....
My thought would be to use an AC opto coupler like the H11AA1 and its output to drive a 12 volt DC relay which in turn would send the 16 V AC to the external doorbell. I need only the front door for the external doorbell.
Any thoughts would be appreciated....