Momentary lockout Solenoid

[alec_t]

Yes, 24v is too high.. My bad. Use a lower voltage supply.
M1 is an N_channel MOSFET. R4 is there to damp any oscillation.

 

[syntax_x]

Will the circuit still work with a 5v feed at a much lower current?

 

[alec_t]

The relay would need to be a 5v coil type and the MOSFET M1 a logic-level N type.

 

[syntax_x]

The relay is 5v coil type. I'll grab the MOSFET today and try it out.
Thanks.

 

[syntax_x]

What value does the pot change?

 

[syntax_x]

Alec-t, the .asc file you linked with the image of the 555 circuit do not match.

The .asc file has a 250k pot and only 1 470n cap, the other is a 1uf cap.

Setting the circuit up the way the jpeg is does not simulate.

I have ran 2 separate sims that i think will work for me

The first is basically the same as your first alec-t


The second circuit replaces the 1k resistor with a 20k, which seems to knock out any future solenoid activation while the trigger is depressed.


The 1uf cap should of been labeled "1u" in both pictures sorry.

 

[syntax_x]

Heres what im hoping will work for me, it allows me to tune the single inputs response via the 250k pot

**broken link removed**

 

[alec_t]

Will take a look when I get back from hol.

 

[syntax_x]

got a couple of these **broken link removed**

 

[alec_t]

The link in post #27 is invalid. Can you repost? BTW, the pot is there to adjust the time for which the solenoid is energised, to allow for the current to build up in the coil and for the solenoid to pull in. The lockout time is determined by R1C1. R2 is there only to limit discharge current through the switch, to prolong the switch contact life. It has nothing to do with the timing and its value is non-critical.

 

[syntax_x]

Sorry for the delay, ive been trying to learn how to use lt spice correctly but i haven't been able to find or make a working 5v relay simulation.

This is as far as i got.

**broken link removed**

 

[alec_t]

i haven't been able to find or make a working 5v relay simulation.

Just use an inductor in the sim; say 100mH and 100Ω series resistance.

 

[syntax_x]

Why is the distance between the 1st and 2nd pulse always larger than the 2nd and 3rd.

Considering my config I should just be able to ground your trig as the circuit is only powered by my trig closed.
Also, do you think I should put a diode on the +5v connected to ground?

 

[syntax_x]

Ive update the following link with an inductor used as the relay but still cant run it in the sim.
**broken link removed**

I removed the trigger and r1 from your original post alec-t and when running 250k pot at 180 its gives me a one shot pulse of.2 seconds upon power up.
**broken link removed**

So everything should work fine im gathering, i received the nMOSFEsS today, logic level ones,
as soon as i look thru the data sheet and find the pinouts for the nMOSFET ill solder it in and give it a go.

 

[alec_t]

Sorry, my bad. I hadn't checked your asc file when I replied about the relay simulation. Ignore that reply.
I'm afraid your config in the post #31 link won't do what you want as you have trig grounded and the relay isn't simulated accurately.
The FET does the switching of the solenoid, making a relay unnecessary. You could use a relay instead of the FET.

Why is the distance between the 1st and 2nd pulse always larger than the 2nd and 3rd.

That's just because of the way the sim is set up with a 0.2sec delay on the simulated trigger pulse. You can easily alter that if you wish. At power-up the 555 circuit is triggered, causing a spurious activation of the solenoid. That could be prevented by adding suitable components to the Reset input of the 555 if necessary.
Attached is a revised asc file for a circuit which I think should meet your needs.

 

[syntax_x]

I havent checked your new sim but i wired everything up as id shown in my last post, removing the trigger resistor and such. wired the fet and relay and tuned the pot to 90k and its working with the solenoid perfectly.
70k is where i start to get into problems.

Last night while i was bored of waiting for the fet i wired only the relay to the solenoid, no ne555 or anything else.
I knew this would keep the solenoid engaged but i just wanted to test out the relays really. They have an led indicator which helps.

While i was testing i found that the relay had some kind of interference with the guns optic. Rapid firing seemed to throw the target off screen.
Maybe something was playing around with the +5 feed i am getting off the optic.

But during my tests tonight everything has run perfectly. Do you think keeping the fet is a good idea to keep the interference away?

 

[syntax_x]

I know this doesn't simulate properly but its the most accurate way for me to show you what Ive done.

**broken link removed**


Thanks again for your help alec, when ive got some good lighting ill show you what youve helped me create.
This will help alot of arcade and gaming guys out there.

 

[syntax_x]

 

[alec_t]

If you're determined to use a relay then you must have a reverse-biased diode connected across the relay coil (the same way as D1 is connected across the solenoid coil) to prevent damage to the FET, and spurious effects, caused by the back-emf generated by the relay coil inductance when the relay switches off.

 

[syntax_x]

ok ive added the diode, cheers.
Im making another one today without the fet, if its not needed then its just added delay.

should i wire it up like this?

**broken link removed**