Hi
have a 16f628a pic going to a uln2003a that controls 3 dpdt relays
relay 1 controls fwd / back motor1
relay 2 controls fwd / back motor2
relay 3 is to control which motor to control etc...
as in picture attached
eg: turn relay 3 on and relay 1 on and motor 1 turns fwd
i could do it with relay 1 and relay2 and 2 spst relays but i have only these 3 relays
any help????
MOD i did post this in a similar thread but it was better to start a new thread
Since you're using relay 3 to select either relay 1 or relay 2, either SPDT or DPDT will work.
A diode is used to protect the transistor that switch the coil.
thanks for reply
iam using a uln2003a with diodes in
but i was thinking there was a way to use a diode to reduce wiring for forward and reverse cicuits an old model railway trick but i a cant remember now
anyway is posible to have a diagram/instuctions of how relay3 could control relay1 or 2 apart from the vss vdd
thank you
Relay 3 could be used for direction control, or as a pulser as in a blender motor or pool pump. It can also be used to feed the two existing relays, or a third motor.