I need an electronic component that will act as a SPDT solid state relay in the following configuration:
http://img694.imageshack.us/img694/3342/infractionl.gif
Please take note that there are three contacts in the relay, the common (output), a normally-closed contact and normally-open contact.
This is the thing that has made asking this question an all-day effort on many boards:
A battery or battery pack is connected to the normally-open and normally-closed contacts. Therefore there is no complete circuit, nor is there, at any time, a flow of current. Think on this before replying for a minute, and please understand that it has been explained to me a dozen times or more that this makes no sense with regard to accepted electronics theory. There is no point in debating this. I can tell you that the device is very useful when the output is connected to it's destination. I am simply asking for your advice and am very appreciative of your time. If I can't get an answer anywhere, I'm sure I can hack it out myself, with enough time, but it sure would be nice to have some help. So if we could just ignore the "doesn't make sense" aspect for a minute, I would appreciate it. Thanks in advance.
These are the criteria for the relay and oscillator:
1. Very low power consumption, as it will run continuous duty for from 8 hours to several days at a time, and one version is worn on the person.
2. Sufficient isolation between the normally-open and normally-closed contacts to prevent a dead short at the currents and voltages involved.
3. Whether between the NO contact and the common, or between the NC contact and the common, whichever is connected at the moment, there must be less than 1 ohm DC resistance, preferably less than 0.5 ohms.
(The solid state relays I have looked into have a very high DC resistance [25 ohms or more] which will not work)
4. The oscillator should be capable of alternating the relay from one cycle per minute to 1MHz, however one cycle per 10 seconds to 50 KHz is acceptable.
5. Low number of parts (simplicity)
6. Economy as to parts ($)
This is not a commercial venture. I simply wish to come up with a more simple version of the machine I have been using (electromechanical) to increase it's alternation frerquency range and so it can be made by anyone with electronic hobbyist skills.
I look forward to your replies, and again, thanks very much for your time.
http://img694.imageshack.us/img694/3342/infractionl.gif
Please take note that there are three contacts in the relay, the common (output), a normally-closed contact and normally-open contact.
This is the thing that has made asking this question an all-day effort on many boards:
A battery or battery pack is connected to the normally-open and normally-closed contacts. Therefore there is no complete circuit, nor is there, at any time, a flow of current. Think on this before replying for a minute, and please understand that it has been explained to me a dozen times or more that this makes no sense with regard to accepted electronics theory. There is no point in debating this. I can tell you that the device is very useful when the output is connected to it's destination. I am simply asking for your advice and am very appreciative of your time. If I can't get an answer anywhere, I'm sure I can hack it out myself, with enough time, but it sure would be nice to have some help. So if we could just ignore the "doesn't make sense" aspect for a minute, I would appreciate it. Thanks in advance.
These are the criteria for the relay and oscillator:
1. Very low power consumption, as it will run continuous duty for from 8 hours to several days at a time, and one version is worn on the person.
2. Sufficient isolation between the normally-open and normally-closed contacts to prevent a dead short at the currents and voltages involved.
3. Whether between the NO contact and the common, or between the NC contact and the common, whichever is connected at the moment, there must be less than 1 ohm DC resistance, preferably less than 0.5 ohms.
(The solid state relays I have looked into have a very high DC resistance [25 ohms or more] which will not work)
4. The oscillator should be capable of alternating the relay from one cycle per minute to 1MHz, however one cycle per 10 seconds to 50 KHz is acceptable.
5. Low number of parts (simplicity)
6. Economy as to parts ($)
This is not a commercial venture. I simply wish to come up with a more simple version of the machine I have been using (electromechanical) to increase it's alternation frerquency range and so it can be made by anyone with electronic hobbyist skills.
I look forward to your replies, and again, thanks very much for your time.