Transistor is protected against inductive transient in relay with diode.
But I meant , how to protect relay switch contacts against transients and electric arc.
Have you ever mentioned , which electric sizes are the used motors.
Voltage 12Vdc ,but max. current or power / one motor.
What kind of power source you are thinking to use supply this system.
Transistor is protected against inductive transient in relay with diode.
But I meant , how to protect relay switch contacts against transients and electric arc.
Have you ever mentioned , which electric sizes are the used motors.
Voltage 12Vdc ,but max. current or power / one motor.
What kind of power source you are thinking to use supply this system.
i was thinking of using 12vdc DPST reed relays as i have lots of these and it suits my need of completely disconnecting power from the motor as im planning to make two of these circuits one for sending the motors one direction and one to send it back for the same distance/time in the other direction.
so a push of a button on one circuit it will do the sequence one way until stop then a push of the button on the other circuit will reverse the whole procedure.
so if it were possible to make it stop at the end of the sequence then there would also be no need for the stop/run switch as then just the reset would be needed?
Here they come: Congratulations, not too bad at all ;-)
However, I've added some amendments (A), changes (C), and recommendations (R) :
(C) power supply
(A) extra push button for "stop" Sw2
(C) Sw1 designation from "Toggle Switch" to "Push Button"
(R) R4..11 = 1kΩ
(R) R12, R13 can be omitted (≘ 0Ω)
(R) R5 (after D1) = 100Ω (lowest power rating) instead of 10Ω / 2W
(C) D1 & D2..9 type designations exchanged
For the automatic stop of the second sequence (opposite direction) you need a second start/stop circuit (identical to the first one), for which you'd use the other two gates from IC3.
You cannot use output "0", as it will be set active by the reset. So if you want to control 8 motors, you must revert to the 4017 IC .
In order to avoid immediate simultaneous run of both sequences, you must press and hold both "stop" buttons during power up.