Author: JamesDate: 06:47 26-01-07
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Hi everyone,
I'm looking for a component that would have three leads, is a switch in
nature, and acts ultimately like a thyristor EXCEPT one electrical pulse (at
the 'gate') would turn the switch 'on' (followed by a period of no
electrical activity) and a further pulse (at the 'gate') would turn the
switch 'off' - single pulses dictating the switch state (i.e no need for
continuous current to keep switch in a certain state.) What would this
component most likely be?
James
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Author: JamesDate: 07:35 26-01-07
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I think what I'm looking for is called a Latching Relay. There's little
information available on them on the net. Anyone know how I would go about
making one controlled by a pulse?
James
"James" <james.merry@ntlworld.com> wrote in message
news:zTluh.81113$z01.72624@newsfe3-gui.ntli.net...
> Hi everyone,
>
> I'm looking for a component that would have three leads, is a switch in
> nature, and acts ultimately like a thyristor EXCEPT one electrical pulse
(at
> the 'gate') would turn the switch 'on' (followed by a period of no
> electrical activity) and a further pulse (at the 'gate') would turn the
> switch 'off' - single pulses dictating the switch state (i.e no need for
> continuous current to keep switch in a certain state.) What would this
> component most likely be?
>
>
> James
>
>
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Author: EeyoreDate: 07:39 26-01-07
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Author: John FieldsDate: 07:53 26-01-07
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On Fri, 26 Jan 2007 11:47:43 GMT, "James" <james.merry@ntlworld.com>
wrote:
>Hi everyone,
>
>I'm looking for a component that would have three leads, is a switch in
>nature, and acts ultimately like a thyristor EXCEPT one electrical pulse (at
>the 'gate') would turn the switch 'on' (followed by a period of no
>electrical activity) and a further pulse (at the 'gate') would turn the
>switch 'off' - single pulses dictating the switch state (i.e no need for
>continuous current to keep switch in a certain state.) What would this
>component most likely be?
---
Imaginary. ;)
--
JF
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Author: John FieldsDate: 08:05 26-01-07
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On Fri, 26 Jan 2007 12:39:49 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:
>
>
>James wrote:
>
>> I think what I'm looking for is called a Latching Relay.
>
>Yes. Or bistable relay.
---
Only if one of the coil leads is common with one of the contacts,
since he's asking for three leads.
Also, unless the toggle is mechanical, he'll have to use a positive
pulse to say, SET the relay and a negative pulse to RESET it.
--
JF
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Author: BanDate: 10:09 26-01-07
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James wrote:
> Hi everyone,
>
> I'm looking for a component that would have three leads, is a switch
> in nature, and acts ultimately like a thyristor EXCEPT one electrical
> pulse (at the 'gate') would turn the switch 'on' (followed by a
> period of no electrical activity) and a further pulse (at the 'gate')
> would turn the switch 'off' - single pulses dictating the switch
> state (i.e no need for continuous current to keep switch in a certain
> state.) What would this component most likely be?
>
>
> James
a Flip-Flop? eventually followed by a MosFet, BJT or relais.
--
ciao Ban
Apricale, Italy
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Author: Wim LewisDate: 12:17 26-01-07
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In article <vtujr29dhiqai0bhuqs84pu3qoil25h1aq@4ax.com>,
John Fields <jfields@austininstruments.com> wrote:
>On Fri, 26 Jan 2007 12:39:49 +0000, Eeyore
><rabbitsfriendsandrelations@hotmail.com> wrote:
>>James wrote:
>>> I think what I'm looking for is called a Latching Relay.
>>
>>Yes. Or bistable relay.
>
>Also, unless the toggle is mechanical, he'll have to use a positive
>pulse to say, SET the relay and a negative pulse to RESET it.
Perhaps a stepping relay, like from an old telephone exchange, but
with only two contacts, would satisfy the original request...
--
Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1
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Author: John FieldsDate: 12:49 26-01-07
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On Fri, 26 Jan 2007 17:17:56 +0000 (UTC), Wim Lewis <wiml@hhhh.org>
wrote:
>In article <vtujr29dhiqai0bhuqs84pu3qoil25h1aq@4ax.com>,
>John Fields <jfields@austininstruments.com> wrote:
>>On Fri, 26 Jan 2007 12:39:49 +0000, Eeyore
>><rabbitsfriendsandrelations@hotmail.com> wrote:
>>>James wrote:
>>>> I think what I'm looking for is called a Latching Relay.
>>>
>>>Yes. Or bistable relay.
>>
>>Also, unless the toggle is mechanical, he'll have to use a positive
>>pulse to say, SET the relay and a negative pulse to RESET it.
>
>Perhaps a stepping relay, like from an old telephone exchange, but
>with only two contacts, would satisfy the original request...
---
Yes, but they had lots of contacts on them, so there'd need to be an
even number of contacts and every other contact would have to be
connected in parallel with the contacts between them left
unconnected in order to get the ON-OFF-ON-OFF action.
There also used to be a line of switches made by Ledex that used a
rotary solenoid driving a rotary switch wafer that would work.
--
JF
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Author: Homer J SimpsonDate: 14:00 26-01-07
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"James" <james.merry@ntlworld.com> wrote in message
news:zTluh.81113$z01.72624@newsfe3-gui.ntli.net...
> I'm looking for a component that would have three leads, is a switch in
> nature, and acts ultimately like a thyristor EXCEPT one electrical pulse
> (at
> the 'gate') would turn the switch 'on' (followed by a period of no
> electrical activity) and a further pulse (at the 'gate') would turn the
> switch 'off' - single pulses dictating the switch state (i.e no need for
> continuous current to keep switch in a certain state.) What would this
> component most likely be?
Mechanical or solid state? Do you have one?
--
.
.
.
.
.
.
.
.
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Author: jasenDate: 13:50 27-01-07
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On 2007-01-26, James <james.merry@ntlworld.com> wrote:
> Hi everyone,
>
> I'm looking for a component that would have three leads, is a switch in
> nature, and acts ultimately like a thyristor EXCEPT one electrical pulse (at
> the 'gate') would turn the switch 'on' (followed by a period of no
> electrical activity) and a further pulse (at the 'gate') would turn the
> switch 'off' - single pulses dictating the switch state (i.e no need for
> continuous current to keep switch in a certain state.) What would this
> component most likely be.
If that "period of no electrical activity" includes no current through the
main terminals it sounds like a latching relay.
If you just mean no activity on the control (while the device is still
passing main current) you're describing a GTO SCR. GTO="Gate Turn-Off"
--
Bye.
Jasen
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Author: jasenDate: 14:06 27-01-07
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On 2007-01-26, James <james.merry@ntlworld.com> wrote:
> Hi everyone,
>
> I'm looking for a component that would have three leads, is a switch in
> nature, and acts ultimately like a thyristor EXCEPT one electrical pulse (at
> the 'gate') would turn the switch 'on' (followed by a period of no
> electrical activity) and a further pulse (at the 'gate') would turn the
> switch 'off' - single pulses dictating the switch state (i.e no need for
> continuous current to keep switch in a certain state.) What would this
> component most likely be?
another thought: you could be descriibing an IGBT.
Bye.
Jasen
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