The circuit in the attached pic works 100%
it uses a 3021 triac driver to operate a 230v AC
relay, I tested it and it seems to work fine, but
will it stay reliable or will there be any flyback
voltage that will eventually damage the opto coupler?
do you even get flyback with AC ?
Do I need to add any components across the relay contacts
like a snubber to make them last under heavy loads or to
stop any interference?
The opto seems to work fine in stopping any interference going back
through the circuit causing false triggering etc..
The relay coil draws under 10ma and the triac in the opto is
rated at 100ma at 400V AC. and is non zero crossing.
Everyone is probably wondering why I didn't just use a Solid State Relay..
1. Too expensive
2. Requires heatsinking for heavy loads
Any help or suggestions greatly appreciated,
thanks in advance,
Wayno
it uses a 3021 triac driver to operate a 230v AC
relay, I tested it and it seems to work fine, but
will it stay reliable or will there be any flyback
voltage that will eventually damage the opto coupler?
do you even get flyback with AC ?
Do I need to add any components across the relay contacts
like a snubber to make them last under heavy loads or to
stop any interference?
The opto seems to work fine in stopping any interference going back
through the circuit causing false triggering etc..
The relay coil draws under 10ma and the triac in the opto is
rated at 100ma at 400V AC. and is non zero crossing.
Everyone is probably wondering why I didn't just use a Solid State Relay..
1. Too expensive
2. Requires heatsinking for heavy loads
Any help or suggestions greatly appreciated,
thanks in advance,
Wayno
Last edited: