P
Pete
- Jan 1, 1970
- 0
Hey Everyone,
First of all, thanks for reading this. I'm a beginner at electronics so
you know.
I'm looking for an IC to use in a particular project. I'm designing a
four-barrel automatic paintball-gun turret. I've succeeded in making a
two-barrel version already. It took me three revisions. Anyways,
I'm looking for a quad AND gate IC. It must trigger on the leading edge
of a 5v HIGH signal. Preferably something CMOS, nice and durable. You
don't want your gun turret to die in the middle of a fire fight.
(you can skip the next paragraph.. unless you're interested)
The device drives solonoids, which physically pull the firing pins in
the guns. A 555 timer pulses at 40Hz, and a 4017 decade counter divides
the timing signal into four lines. However, the output from the 4017
can't go straight to the solonoids; the duty cycle is too long. If the
firing pin is not returned immediately, the gun will not be able to
re-cock itself. So using four AND gates, the 4017 can be filtered by
the 555 output, making it so that each channel has a short duty cycle
as determined by the 555. This allows the solonoids to pop down and
return up very quickly, before the next solonoid fires.
In my first model, which fired two guns in automatic succession of
eachother, I used PNP transistors as AND gates. These were leaky, and
caused random gunfire. Plus, their overall implementation consumed
space and allowed for more error. I want to replace them with an IC
package specifically designed as an AND gate, that runs on 5 volts, and
maybe has schmitt triggers. So if anybody has any suggestions on which
IC to use, your advice would be appreciated.
You can skip the next paragraph too.
The leakiness issue probably raises a few of your eyebrows. It sure
raised mine. I never really narrowed down the cause to anything in
specific. Might have been caused by induction current from the
solonoids, which consume 4 amps, and probably create massive induction
spikes. These are defeated by high voltage diodes, but perhaps the
current is looping through and causing the solonoid to double-fire. Or
leaking through a film of flux on the PCB and triggering the power
amp's base pin. I better implement a discharge lamp to kill that
induction spike. Oh well. I'll do all that later. For now I need to
eliminate all other possibilities.. like the homemade AND gates.
Thanks everyone for your time.
First of all, thanks for reading this. I'm a beginner at electronics so
you know.
I'm looking for an IC to use in a particular project. I'm designing a
four-barrel automatic paintball-gun turret. I've succeeded in making a
two-barrel version already. It took me three revisions. Anyways,
I'm looking for a quad AND gate IC. It must trigger on the leading edge
of a 5v HIGH signal. Preferably something CMOS, nice and durable. You
don't want your gun turret to die in the middle of a fire fight.
(you can skip the next paragraph.. unless you're interested)
The device drives solonoids, which physically pull the firing pins in
the guns. A 555 timer pulses at 40Hz, and a 4017 decade counter divides
the timing signal into four lines. However, the output from the 4017
can't go straight to the solonoids; the duty cycle is too long. If the
firing pin is not returned immediately, the gun will not be able to
re-cock itself. So using four AND gates, the 4017 can be filtered by
the 555 output, making it so that each channel has a short duty cycle
as determined by the 555. This allows the solonoids to pop down and
return up very quickly, before the next solonoid fires.
In my first model, which fired two guns in automatic succession of
eachother, I used PNP transistors as AND gates. These were leaky, and
caused random gunfire. Plus, their overall implementation consumed
space and allowed for more error. I want to replace them with an IC
package specifically designed as an AND gate, that runs on 5 volts, and
maybe has schmitt triggers. So if anybody has any suggestions on which
IC to use, your advice would be appreciated.
You can skip the next paragraph too.
The leakiness issue probably raises a few of your eyebrows. It sure
raised mine. I never really narrowed down the cause to anything in
specific. Might have been caused by induction current from the
solonoids, which consume 4 amps, and probably create massive induction
spikes. These are defeated by high voltage diodes, but perhaps the
current is looping through and causing the solonoid to double-fire. Or
leaking through a film of flux on the PCB and triggering the power
amp's base pin. I better implement a discharge lamp to kill that
induction spike. Oh well. I'll do all that later. For now I need to
eliminate all other possibilities.. like the homemade AND gates.
Thanks everyone for your time.
