Boost the voltage of an output
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Posts: 46,084
Hey All,
Forgive me if this question is off-topic, but it does involve a basic
stamp.
I want to control the communications between 2 devices using a basic
stamp to manage the communications. The basic stamp is connected to
both devices and both devices are connected to each other over a single
pin.
The problem is the 2 devices disagree on what High is.
1 device high state is about 2.7 volts and low of about 1.7 and the
device I want to talk to is looking for a high input of about 3.5 volts
and a low about 1.4.
I have been reading around and I think this can be solved a few ways
1. connect 2 logic gates in parallel which will almost double my
output voltage then pull it back a little with a resistor.
2. get a power mosfet that meets my specifications.
3. use a silicon controlled rectifier.
I'm very inexperienced do these options make sense?
Any recommendations?
Thanks,
Ben
Forgive me if this question is off-topic, but it does involve a basic
stamp.
I want to control the communications between 2 devices using a basic
stamp to manage the communications. The basic stamp is connected to
both devices and both devices are connected to each other over a single
pin.
The problem is the 2 devices disagree on what High is.
1 device high state is about 2.7 volts and low of about 1.7 and the
device I want to talk to is looking for a high input of about 3.5 volts
and a low about 1.4.
I have been reading around and I think this can be solved a few ways
1. connect 2 logic gates in parallel which will almost double my
output voltage then pull it back a little with a resistor.
2. get a power mosfet that meets my specifications.
3. use a silicon controlled rectifier.
I'm very inexperienced do these options make sense?
Any recommendations?
Thanks,
Ben
Comments
However the reality is than each regulator output is set by its
internal reference. with regulators in parallel the device with the
higher output setting will provide all the current because the other
regulator will shut off. Even a few millivolts of difference in the
output of the regulator is enough to shut off the regualtor with
lower output voltage.
writes:
> Hey All,
>
> Forgive me if this question is off-topic, but it does involve a basic
> stamp.
>
> I want to control the communications between 2 devices using a basic
> stamp to manage the communications. The basic stamp is connected to
> both devices and both devices are connected to each other over a single
> pin.
>
> The problem is the 2 devices disagree on what High is.
>
> 1 device high state is about 2.7 volts and low of about 1.7 and the
> device I want to talk to is looking for a high input of about 3.5 volts
> and a low about 1.4.
>
> I have been reading around and I think this can be solved a few ways
>
> 1. connect 2 logic gates in parallel which will almost double my
> output voltage then pull it back a little with a resistor.
>
> 2. get a power mosfet that meets my specifications.
>
> 3. use a silicon controlled rectifier.
>
> I'm very inexperienced do these options make sense?
>
> Any recommendations?
>
> Thanks,
>
> Ben
Ben,
For the device that recognizes high as 2.7 volts, what is the supply voltage
to this device, is it 5 volts?
For the device that recognizes high as 3.5 volts, what is the supply voltage
to this device, is it also 5 volts?
If both devices are not powered by 5 volts, what is the supply power to each
device. The answer to these questions will be needed to give you a solution.
[noparse][[/noparse]Non-text portions of this message have been removed]
> For the device that recognizes high as 2.7 volts, what is the supply
> voltage
> to this device, is it 5 volts?
No the power source is 2 AA batteries I observed to be around 2.7
volts.
>
> For the device that recognizes high as 3.5 volts, what is the supply
> voltage
> to this device, is it also 5 volts?
Yes this power supply is 5 volts
>
> If both devices are not powered by 5 volts, what is the supply power
> to each
> device. The answer to these questions will be needed to give you a
> solution.
Thanks for your interest.
Ben
writes:
> >For the device that recognizes high as 2.7 volts, what is the supply
> >voltage
> >to this device, is it 5 volts?
>
> No the power source is 2 AA batteries I observed to be around 2.7
> volts.
>
> >
> >For the device that recognizes high as 3.5 volts, what is the supply
> >voltage
> >to this device, is it also 5 volts?
>
> Yes this power supply is 5 volts
>
> >
> >If both devices are not powered by 5 volts, what is the supply power
> >to each
> >device. The answer to these questions will be needed to give you a
> >solution.
>
> Thanks for your interest.
>
> Ben
>
Ben,
One simple and reliable solution (at the expense of pin and hardware) is to
use opto isolators, like a 4N35. Also, there will be inversion with the logic
level, but this can easily be dealt with with the software. Or, an additional
transistor will eliminate inversion......
<A
HREF="http://www.fairchildsemi.com/ds/4N/4N35.pdf">http://www.fairchildsemi.com/\
ds/4N/4N35.pdf</A>
If you are unclear on how to use the device, you can send me your phone
number directly to my email address and I could call you. Trying to explain in
writing is possible, but cumbersome.
[noparse][[/noparse]Non-text portions of this message have been removed]
voltages as you like and protect both.
Jim
http://www.geocities.com/jimforkin2003/
Original Message
From: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JC3qzbYz9lAqkxS0jahHLDySuaDpKbnopzhHOCxqY9aP3QRbFLhWmeBWg4wbEBpruNB6kdFVMSQ]smartdim@a...[/url
Sent: Saturday, August 16, 2003 9:53 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Boost the voltage of an output
In a message dated 8/16/2003 4:24:41 AM Pacific Daylight Time, ben@c...
writes:
> Hey All,
>
> Forgive me if this question is off-topic, but it does involve a basic
> stamp.
>
> I want to control the communications between 2 devices using a basic
> stamp to manage the communications. The basic stamp is connected to
> both devices and both devices are connected to each other over a single
> pin.
>
> The problem is the 2 devices disagree on what High is.
>
> 1 device high state is about 2.7 volts and low of about 1.7 and the
> device I want to talk to is looking for a high input of about 3.5 volts
> and a low about 1.4.
>
> I have been reading around and I think this can be solved a few ways
>
> 1. connect 2 logic gates in parallel which will almost double my
> output voltage then pull it back a little with a resistor.
>
> 2. get a power mosfet that meets my specifications.
>
> 3. use a silicon controlled rectifier.
>
> I'm very inexperienced do these options make sense?
>
> Any recommendations?
>
> Thanks,
>
> Ben
Ben,
For the device that recognizes high as 2.7 volts, what is the supply voltage
to this device, is it 5 volts?
For the device that recognizes high as 3.5 volts, what is the supply voltage
to this device, is it also 5 volts?
If both devices are not powered by 5 volts, what is the supply power to each
device. The answer to these questions will be needed to give you a solution.
[noparse][[/noparse]Non-text portions of this message have been removed]
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the base voltage on a pass transistor instead and then you can pass the
higher current up to the capabilities of the pass transistor.
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: Albert Catano [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VXhOIZETECg-Nhvvy3Jo_geKyf6Xgm4IrfhnlNTJitzAXUhCMW1ZhPbFYgp4eSfMaMefifOwp5loKUinGzQ]acatano2002@y...[/url
Sent: Saturday, August 16, 2003 9:00 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Boost the voltage of an output
Connecting 3-terminal regulators in parallel may seems to work.
However the reality is than each regulator output is set by its
internal reference. with regulators in parallel the device with the
higher output setting will provide all the current because the other
regulator will shut off. Even a few millivolts of difference in the
output of the regulator is enough to shut off the regualtor with
lower output voltage.
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/
circuit protection.