I have a doorbell that uses 18V. I'd like to put a relay between so that I can record when doorbell rang (the relay is wired to a computer).
Unfortunately the relay seem to introduce too much resistance as the doorbell won't ring:
(not working) +-------+ | | | +-------------->| Relay coil |------> gnd Bell | | | | | | | +--------- --------------------< Vcc | | / +-------+ / Switch /
Would this help? +-------+ | | | +------+------>| Relay coil |------> gnd Bell | | | | | +---------------------------> gnd | | | +--------- --------------------< Vcc | | / +-------+ / Switch /