How to connect a dual coil relay ?

[stregoi]

Hi, i am a very beginner in electronics, i am trying to make this circuit below. So when i push the first pushbutton, the motor should turn, and when i push the second push button the motor should turn in reverse.
as i can see from the schematics, they used a single coil DPDT, with 8 poles ( i think ) ... but i have a dual coil DPDT, with 10 poles ( TQ2-2L-5V ).
how can i use my DPDT relay instead of the one shown in the schmatics, i tried really, i cannot figure it out.
thanks


and bellow is the diagram of TQ-2L-5v

 

[chuckey]

Try connecting both - together and to the PSU -, touch PSU + to one of the relays + pins should pull relay in. Touching it to the other + should drop the relay out.
Frank

 

[stregoi]

Thank you for your answer Frank. i know how to connect the relay to get it switch between the two coils, and can get it working by it self with the motor.
My problem is when i hook it to the ULN2003, i just cannot get it work. i tried different approaches, i just can't figure out how to modify my circuit, an replace the single coil with my dual coil relay

 

[chuckey]

If you have a spare section of your ULN2003, then use it as an inverter and to drive the "other" coil. So one coil goes 0->1, the other goes 1 ->0. Resistor from OP1 to IP2, with another resistor to earth to make sure the relay supply voltage does not overload the voltage rating for the ULN2003 input. Err or something like that.
Frank

 

[HTA]

If you have a dual coil it should be a bistable relay?! If so, you can't use the ULN2003(open collector type). What you need are two push-pull output stages to drive it, like described in here: https://ichaus.biz/wp8_whitepaper_en .

Enjoy your design work!

 

[stregoi]

that sounds complicated, as mentioned in the begining i am really just a newbee in electronics. how can i change my original schematics to fit the new relay ?

 

[colin55]

You have a single coil relay The contacts are double-pole double-throw