How to wire a transistor?

Sure, thank you kindly for asking.

I used to play with rockets when I was a kid, but feel free to enlighten me on the topic.

A thrystor is a device such as a SCR or TRIAC.  These devices turn on well, but they latch on and rely on the current ending for some other reason to turn off.  We refer to their control terminals as 'triggers.'  If your (presumably nichrome) heating element melts out, this would represent the sort of functionality we would need (current going to a low/no level) to employ a thrystor.

Solenoids are electromagnets.  They can be used to actuate valves, for example.  For the purposes of this discussion, little electric motors would be electrically similar.  We can trick a linear voltage regulator into behaving like a switch by spoofing its adjustment terminal, making it think that the load does or doesn't need more current.  There are provisions on a voltage regulator chip that makes it shut down when it overheats.  Actually, when these were being developed, they also came out with a power Q called the LM195 that was provisioned with the overheat apparat.  Regular old transistors don't have this feature, but we can add it externally, which is a small bother.  Your duty cycle is low in this application, so this probably doesn't interest you now.  I try to write for the general lurker.

Application notes from the LM117 era can illuminate this further.

Do you have a datasheet or manufacturer P/N for the ignitors?  What is their electrical resistance?

Dear: Don

I am very sorry I really thought for a while I was under standing what a Tryristor was but I am still not getting what it is again in an easier way I can understand. Also you said the following...

Don Hersey wrote:

 

Sure, thank you kindly for asking.

 

I used to play with rockets when I was a kid, but feel free to enlighten me on the topic.

A thrystor is a device such as a SCR or TRIAC.  These devices turn on well, but they latch on and rely on the current ending for some other reason to turn off.  We refer to their control terminals as 'triggers.'  If your (presumably nichrome) heating element melts out, this would represent the sort of functionality we would need (current going to a low/no level) to employ a thrystor.

Solenoids are electromagnets.  They can be used to actuate valves, for example.  For the purposes of this discussion, little electric motors would be electrically similar.  We can trick a linear voltage regulator into behaving like a switch by spoofing its adjustment terminal, making it think that the load does or doesn't need more current.  There are provisions on a voltage regulator chip that makes it shut down when it overheats.  Actually, when these were being developed, they also came out with a power Q called the LM195 that was provisioned with the overheat apparat.  Regular old transistors don't have this feature, but we can add it externally, which is a small bother.  Your duty cycle is low in this application, so this probably doesn't interest you now.  I try to write for the general lurker.

 

Application notes from the LM117 era can illuminate this further.

 

Do you have a datasheet or manufacturer P/N for the ignitors?  What is their electrical resistance?

First of all I don't know what an SCR or TRIAC is. Second of all I don't know what a nichrome is when you said "We refer to their control terminals as 'triggers.'  If your (presumably nichrome) heating element melts out, this would represent the sort of functionality we would need (current going to a low/no level) to employ a thrystor." Also you said Solenoids when you said "Solenoids are electromagnets.  They can be used to actuate valves, for example.  For the purposes of this discussion, little electric motors would be electrically similar.  We can trick a linear voltage regulator into behaving like a switch by spoofing its adjustment terminal, making it think that the load does or doesn't need more current." And that is what I don't get and also I am sorry I sent you the wrong datasheet I will send you one soon. Thank you !!!

From: Noah

Dear: Don

I am very sorry I really thought for a while I was under standing what a Tryristor was but I am still not getting what it is again in an easier way I can understand. Also you said the following...

Don Hersey wrote:

 

Sure, thank you kindly for asking.

 

I used to play with rockets when I was a kid, but feel free to enlighten me on the topic.

A thrystor is a device such as a SCR or TRIAC.  These devices turn on well, but they latch on and rely on the current ending for some other reason to turn off.  We refer to their control terminals as 'triggers.'  If your (presumably nichrome) heating element melts out, this would represent the sort of functionality we would need (current going to a low/no level) to employ a thrystor.

Solenoids are electromagnets.  They can be used to actuate valves, for example.  For the purposes of this discussion, little electric motors would be electrically similar.  We can trick a linear voltage regulator into behaving like a switch by spoofing its adjustment terminal, making it think that the load does or doesn't need more current.  There are provisions on a voltage regulator chip that makes it shut down when it overheats.  Actually, when these were being developed, they also came out with a power Q called the LM195 that was provisioned with the overheat apparat.  Regular old transistors don't have this feature, but we can add it externally, which is a small bother.  Your duty cycle is low in this application, so this probably doesn't interest you now.  I try to write for the general lurker.

 

Application notes from the LM117 era can illuminate this further.

 

Do you have a datasheet or manufacturer P/N for the ignitors?  What is their electrical resistance?

First of all I don't know what an SCR or TRIAC is. Second of all I don't know what a nichrome is when you said "We refer to their control terminals as 'triggers.'  If your (presumably nichrome) heating element melts out, this would represent the sort of functionality we would need (current going to a low/no level) to employ a thrystor." Also you said Solenoids when you said "Solenoids are electromagnets.  They can be used to actuate valves, for example.  For the purposes of this discussion, little electric motors would be electrically similar.  We can trick a linear voltage regulator into behaving like a switch by spoofing its adjustment terminal, making it think that the load does or doesn't need more current." And that is what I don't get and also I am sorry I sent you the wrong datasheet I will send you one soon. Thank you !!!

From: Noah