Alternating Signal Direction??
Archiver
Posts: 46,084
Hello All,
I have a slightly off topic question. My project is Basic Stamp
controlled, but my question is regarding a small side circuit that I hope
you can help with. I have 5 volt pulses coming from an optical sensor that
trigger a transistor acting as a switch - simple enough. I would like to
have the pulse train trigger two transistors, one at a time, alternating
from one to the other. One pulse triggers the first transistor, the next
pulse triggers the second, the next triggers the first again - and so on.
What methods would you guys recommend to create this alternating effect to
direct signal pulses from one transistor to the other?
Many thanks for any and all input,
Tim
I have a slightly off topic question. My project is Basic Stamp
controlled, but my question is regarding a small side circuit that I hope
you can help with. I have 5 volt pulses coming from an optical sensor that
trigger a transistor acting as a switch - simple enough. I would like to
have the pulse train trigger two transistors, one at a time, alternating
from one to the other. One pulse triggers the first transistor, the next
pulse triggers the second, the next triggers the first again - and so on.
What methods would you guys recommend to create this alternating effect to
direct signal pulses from one transistor to the other?
Many thanks for any and all input,
Tim
Comments
transistors.
Unless your driving something that needs more than 20ma or so, you could
forego the
transistors.
Original Message
From: Tim and Jo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=h032uquIe_z8ySGkUQZp_PVs1U1tuggpvOlh6u_VVlmy7KBEOQPaS_d76mXRSE29KcFz]dema@t...[/url
Sent: Saturday, July 06, 2002 8:48 PM
To: Basic Stamp List
Subject: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
Hello All,
I have a slightly off topic question. My project is Basic Stamp
controlled, but my question is regarding a small side circuit that I hope
you can help with. I have 5 volt pulses coming from an optical sensor that
trigger a transistor acting as a switch - simple enough. I would like to
have the pulse train trigger two transistors, one at a time, alternating
from one to the other. One pulse triggers the first transistor, the next
pulse triggers the second, the next triggers the first again - and so on.
What methods would you guys recommend to create this alternating effect to
direct signal pulses from one transistor to the other?
Many thanks for any and all input,
Tim
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Is that the basic purpose of a flip-flop? Can you recommend any part
numbers?
Tim
Original Message
From: "Earl Bollinger" <earlwbollinger@a...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, July 06, 2002 7:29 PM
Subject: RE: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
> I would suggest a flip flop integrated circuit, easier than doing it with
> transistors.
> Unless your driving something that needs more than 20ma or so, you could
> forego the
> transistors.
>
>
Original Message
> From: Tim and Jo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=HHvEZK_o3OXKpoySVFf6-iHp3IGyt7mfGqYp_rFK6Bsc2jsWv5eDMez2M8ZKz40NnVg]dema@t...[/url
> Sent: Saturday, July 06, 2002 8:48 PM
> To: Basic Stamp List
> Subject: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
>
>
> Hello All,
>
> I have a slightly off topic question. My project is Basic Stamp
> controlled, but my question is regarding a small side circuit that I hope
> you can help with. I have 5 volt pulses coming from an optical sensor
that
> trigger a transistor acting as a switch - simple enough. I would like to
> have the pulse train trigger two transistors, one at a time, alternating
> from one to the other. One pulse triggers the first transistor, the next
> pulse triggers the second, the next triggers the first again - and so on.
> What methods would you guys recommend to create this alternating effect to
> direct signal pulses from one transistor to the other?
>
> Many thanks for any and all input,
>
> Tim
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
could store a 1 or a 0 in it and read that value as many times as needed.
Another old use was as a frequency divider (divide by two).
The standard flip flop would be a SN7474 dual flipflop
It now comes in a number varieties such as 74L74, 74LS74, 74HC74 and so on.
But for your purposes they are all the same.
http://www.fairchildsemi.com/ds/74/74ACT74.pdf
Here in the US, you can get them at Radio Shack fairly easily. But
www.jameco.com, www.allelectronics.com,
www.bgmicro.com, www.digikey.com should have some variety of the flipflop.
Another flip flop type is the CMOS version CD4013 which has a wider voltage
range over the regular TTL versions
http://rocky.digikey.com/WebLib/Texas%20Instruments/Web%20data/CD4013B.pdf
Radio shack sells these too (or it may be one or the other I forget right
now).
The basic operation would be that you run your signal into clock/pulse
input. Everytime you get a pulse or clock it will toggle the flipflop,
splitting your signal like you wanted. You can use clear input to reset the
flipflop back to a known state.
Original Message
From: Tim and Jo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4zTvECtiN75xo0G-Awfq6G0caZO3V4hG3v8-KChK9ehAZYu-Dl9IADhptc9mrAFnN7Cm]dema@t...[/url
Sent: Saturday, July 06, 2002 10:15 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
Thanks Earl,
Is that the basic purpose of a flip-flop? Can you recommend any part
numbers?
Tim
Original Message
From: "Earl Bollinger" <earlwbollinger@a...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, July 06, 2002 7:29 PM
Subject: RE: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
> I would suggest a flip flop integrated circuit, easier than doing it with
> transistors.
> Unless your driving something that needs more than 20ma or so, you could
> forego the
> transistors.
>
>
Original Message
> From: Tim and Jo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4zTvECtiN75xo0G-Awfq6G0caZO3V4hG3v8-KChK9ehAZYu-Dl9IADhptc9mrAFnN7Cm]dema@t...[/url
> Sent: Saturday, July 06, 2002 8:48 PM
> To: Basic Stamp List
> Subject: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
>
>
> Hello All,
>
> I have a slightly off topic question. My project is Basic Stamp
> controlled, but my question is regarding a small side circuit that I hope
> you can help with. I have 5 volt pulses coming from an optical sensor
that
> trigger a transistor acting as a switch - simple enough. I would like to
> have the pulse train trigger two transistors, one at a time, alternating
> from one to the other. One pulse triggers the first transistor, the next
> pulse triggers the second, the next triggers the first again - and so on.
> What methods would you guys recommend to create this alternating effect to
> direct signal pulses from one transistor to the other?
>
> Many thanks for any and all input,
>
> Tim
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
To UNSUBSCRIBE, just send mail to:
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just the solution I'd hoped for.
Tim
Original Message
From: "Earl Bollinger" <earlwbollinger@a...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, July 07, 2002 4:42 AM
Subject: RE: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
> The flipflops originally were used for memory storage many years ago. You
> could store a 1 or a 0 in it and read that value as many times as needed.
> Another old use was as a frequency divider (divide by two).
>
> The standard flip flop would be a SN7474 dual flipflop
> It now comes in a number varieties such as 74L74, 74LS74, 74HC74 and so
on.
> But for your purposes they are all the same.
> http://www.fairchildsemi.com/ds/74/74ACT74.pdf
> Here in the US, you can get them at Radio Shack fairly easily. But
> www.jameco.com, www.allelectronics.com,
> www.bgmicro.com, www.digikey.com should have some variety of the flipflop.
>
> Another flip flop type is the CMOS version CD4013 which has a wider
voltage
> range over the regular TTL versions
> http://rocky.digikey.com/WebLib/Texas%20Instruments/Web%20data/CD4013B.pdf
> Radio shack sells these too (or it may be one or the other I forget right
> now).
>
> The basic operation would be that you run your signal into clock/pulse
> input. Everytime you get a pulse or clock it will toggle the flipflop,
> splitting your signal like you wanted. You can use clear input to reset
the
> flipflop back to a known state.
>
>
Original Message
> From: Tim and Jo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VJ_SY59dlTyuQjbmiwbLsY47eOw99o4XI6zWSjJuQKCB8itish9FG2wlv4cGsGv1WGDS]dema@t...[/url
> Sent: Saturday, July 06, 2002 10:15 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
>
>
> Thanks Earl,
>
> Is that the basic purpose of a flip-flop? Can you recommend any part
> numbers?
>
> Tim
>
Original Message
> From: "Earl Bollinger" <earlwbollinger@a...>
> To: <basicstamps@yahoogroups.com>
> Sent: Saturday, July 06, 2002 7:29 PM
> Subject: RE: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
>
>
> > I would suggest a flip flop integrated circuit, easier than doing it
with
> > transistors.
> > Unless your driving something that needs more than 20ma or so, you could
> > forego the
> > transistors.
> >
> >
Original Message
> > From: Tim and Jo [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VJ_SY59dlTyuQjbmiwbLsY47eOw99o4XI6zWSjJuQKCB8itish9FG2wlv4cGsGv1WGDS]dema@t...[/url
> > Sent: Saturday, July 06, 2002 8:48 PM
> > To: Basic Stamp List
> > Subject: [noparse][[/noparse]basicstamps] Alternating Signal Direction??
> >
> >
> > Hello All,
> >
> > I have a slightly off topic question. My project is Basic Stamp
> > controlled, but my question is regarding a small side circuit that I
hope
> > you can help with. I have 5 volt pulses coming from an optical sensor
> that
> > trigger a transistor acting as a switch - simple enough. I would like
to
> > have the pulse train trigger two transistors, one at a time, alternating
> > from one to the other. One pulse triggers the first transistor, the
next
> > pulse triggers the second, the next triggers the first again - and so
on.
> > What methods would you guys recommend to create this alternating effect
to
> > direct signal pulses from one transistor to the other?
> >
> > Many thanks for any and all input,
> >
> > Tim
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> > Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject
and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
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> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
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>
>
>