Anyone Want Custom Electro Grip Schematics?

[Chrishew09]

i have one question. why are you using such high resistance values?

Less power consumtion :)

[Troen]

Less power consumtion :)

but it would also make less current for the solenoid to trip, no?

[Chrishew09]

but it would also make less current for the solenoid to trip, no?

The only resistor that determines the current that goes through the solenoid is R4, all the other resistors are for the control and do not need to use a lot of power.

If I needed the circuit to switch at a high frequancy then yes the resistors would need to be lower to ensure that the capacitance of the comparitor did not round off the signals, but since this is functioning very slowly that is not an issue.

[MoeMag]

www.magneticsensorsystems.com

[Chrishew09]

www.magneticsensorsystems.com

Glad to see someone is using this circuit :)
Just to give you a boost of confidance, I have the circuit working on my bench at work as we speak, and it works great.

A power source is up to you I like two 9v's in parallel b/c they are small and with two in parallel you can get twice the output current as one, and a solenoid that is needed to trip the sear most likely needs alot of current (judging from an Emag). What you are proposing with 6 AA's, three in series and two of that in parallel would work even better b/c AA can source more current then a 9v but they are larger.

As far a solenoid I was looking at the same type as the Emag but just a little phisicaly smaller, but I need to measure the force needed to trip the sear before I make a choice.

You can wire any type of switch you want, just make sure that the curcuit can satisfy the current needed for the switch you choose. When you select the solenoid and switch you want to use just PM me with the specs for both and I will crunch the numbers for you and tell you if it will work and if you need to change any values.

I have a box of HALL effect sensors in my desk that I bought just for this type of a project, and I just need to get off my a$$ and get it done.

GOOD LUCK!!

[MoeMag]

[KayleAGD]

like a touch lamp.....

[Chrishew09]

I would be afraid that it would be to sensitive and cause and insain amount of bounce.
Also if you had a glove on then it wouldn't work.

[MoeMag]

[Chrishew09]

Well when it comes to electo markers "bounce" refers to the trigger switch sending noise spikes when it is engaged. Remeber and switch is a machanical device that when pushed does not have a perfict transistion from on to off, what happeneds is the contacts "bounce" off eachother a few times until it is fully engaged. Now these bounces happends in a few mili seconds, so the cuircuit thinks you are pulling the trigger reallyfast and it starts firing the marker acordingly, that coupled with the phisical vibrations of the marker can cause the marker to start running away.

The curcuit i have on my bench using some push button switch I found laying around and it has about 4 or 5 noise spikes when I engage it so I had to install a capacitor to couple them to return.

A capacitor can act as a type of filter to eleminate high frequancy noise spikes in some curcuits. I really cann't go into any further here but read that book you have it should discuss it in more detail.

Spend most of your time learning about resistors they are the most important thing to understand they are the core for every electronic curcuit.

E=I*R Ohm's Law, most important law in electronics everything comes from it.
E=Voltage
I=Current
R=Resistance

If you want pics or waveforms of my curcuit let me know and ill email them to you.

Good Luck

[KayleAGD]

Holy crap !!!! I started drawing the board to scale and CR1 is less than 2mm wide.. I need better eyes. I was hopeing it would be the size of the mos-fet ...

[Chrishew09]

Holy crap !!!! I started drawing the board to scale and CR1 is less than 2mm wide.. I need better eyes. I was hopeing it would be the size of the mos-fet ...

I used all SMT (surface mount technology) parts and yeah they are small. Remember what I told you you can use just about any diode for CR1, so find something larger if you want.

[upjeeper]

sorry for the ignorant question guys -
you don't have any provisions for a microprocessor so how would one go about wiring in an LCD or second solenoid (dual barrel marker) or is that not possible with a board this style?

i've been reading through basic stamp programming and may try to write my own e-trigger code

[Chrishew09]

sorry for the ignorant question guys -
you don't have any provisions for a microprocessor so how would one go about wiring in an LCD or second solenoid (dual barrel marker) or is that not possible with a board this style?

i've been reading through basic stamp programming and may try to write my own e-trigger code

To use a LCD yes, you would need a "micro".
To activate two solenoids you can use this curcuit just put the solenoids in parrallel and make sure that the driving MOSFET and resistors can handle the current.

I guess the question is "why"? Why do you need an LCD, and multible firing modes, I know when I play all I need is semi.

[upjeeper]

To use a LCD yes, you would need a "micro".
To activate two solenoids you can use this curcuit just put the solenoids in parrallel and make sure that the driving MOSFET and resistors can handle the current.

I guess the question is "why"? Why do you need an LCD, and multible firing modes, I know when I play all I need is semi.

why? why not?... i'm just bored and looking for projects
an lcd would be cool just for the heck of it - rate of fire, ball count, my name?...
if i got it going could be something to sell for example