In rebuilding my circuit on the solderless breadboard to make it more compact, So that I could build another beside it to make a 2-channel box. Apparently I damaged 2 of the 3 2N2222 transistors I've forgotten how fragile these things are. Rather than ordering more through the same source and having to wait two weeks for shipping is there a more hearty alternative I can use? Can I even use a package of general NPNs from RS? Or is that specific part critical?
Also I was wondering if the output from the Op Amp can drive (2) transistors, one for an LED, and one for the SSR which has its own, slightly different voltage power supply.(I have a mix of SSRs, some 3v-30v, some 12v-30v. I have the first wired with 6v, the other (2) 9v batteries or 18v, of course.
At this time I can't afford more than about $5 to finish what I started. I would like to take the first 2-channel prototype to a meeting this weekend to demonstrate it and I have only one 2N2222 left for only 1-channel of the prototype. (Yes, there really are people in the world who are that poor.)
Question, why do the tokens on these board time out so easily, or even time out at all? I've lost several posts because if this and the interface is not well enough designed that I see the warning which is not very noticable. I mean, timing out at all is so old thinking.
is there a more hearty alternative I can use? Can I even use a package of general NPNs from RS? Or is that specific part critical?
More hardy ... that depends on what type of damage the 2N2222 sustained ... mechanical? There is not anything particularly critical about the specific transistor, provided the blocking voltage and rated current are appropriate. It is not likely to dissipate much power in this circuit as it is driving an LED and/or a relay.
Also I was wondering if the output from the Op Amp can drive (2) transistors, one for an LED, and one for the SSR which has its own, slightly different voltage power supply.(I have a mix of SSRs, some 3v-30v, some 12v-30v. I have the first wired with 6v, the other (2) 9v batteries or 18v, of course.
The maximum output of a typical op amp is about 30mA, which is plenty for driving 2 transistors in this circuit. However this is not necessary. If it is not convenient to wire the LED to the relay-controlling transistor, then the LED (and current-limiting resistor) can be wired from the output of the op amp to ground. It will still indicate the status of the output that way.
RS has (15) 2N222 packaged together for $3.49. Will those be acceptable replacements for the 2N2222?
I think I damaged the 2N2222s by wiring them wrong when I moved the componets on the breadboard. I built a simple LED lighting circuit and the two don't work, but remaining third spare does.
The maximum output of a typical op amp is about 30mA, which is plenty for driving 2 transistors in this circuit. However this is not necessary. If it is not convenient to wire the LED to the relay-controlling transistor, then the LED (and current-limiting resistor) can be wired from the output of the op amp to ground. It will still indicate the status of the output that way.
Is there a recommended place in the circuit to place the LED, or just try it experimentally at different places, and what resistor should be used. I have some LEDs in a box and otherwise know nothing about them.
Sorry that I don't have time to research this myself and asking too many questions. I'm doing lots of things at the same time. Right now my co-writer from Europe is messing me about every 10 seconds and she gets mad when I don't reply quick enough. This goes on for a couple hours. Then I got to do (write, edit, research) what we talked about. THen I have to find someone that can help us make a pitch video for free so that we can launch a Kickstarter campaign. Because right now I have $1 in the bank and we need to register the screenplays and get money to enter the projects in contests, which most want entry fees. Maybe even hire a "script doctor" to spot problems in the screenplays. Then I have to finish some props for a someone else's web series called "Zops" (a zombie series). I have to script our pitch video and make some digital art for it. Then I have to do some creative cooking each day so that I'm not eating plain pasta every day.Being dyslexic, I screwed up my assistance paper work and now that is getting delayed. And I screwed up my transistors for the circuit (hoping to demo it this weekend at a filmmaking meeting) because I was overly tired. So that's the reason for all the stupid annoying questions.
RS has (15) 2N222 packaged together for $3.49. Will those be acceptable replacements for the 2N2222?
I think I damaged the 2N2222s by wiring them wrong when I moved the componets on the breadboard. I built a simple LED lighting circuit and the two don't work, but remaining third spare does.
"2N222" is a typo ... I just saw it when I searched for npn. The product link is actually for:
"5 of 2N2222, 5 of 2N4401 and 5 of 2N3904"
These are all 40V rated, but vary from 200mA to 1A current rating to the best of my memory. I do not expect any issue with any of them if the SSR and/or LED are the loads.
Is there a recommended place in the circuit to place the LED, or just try it experimentally at different places, and what resistor should be used. I have some LEDs in a box and otherwise know nothing about them.
Sorry that I don't have time to research this myself and asking too many questions. I'm doing lots of things at the same time.
It took longer to write your stuff than it would have to search "op amp LED output" or "led current limit resistor" or such. I'm not trying to be rude, hoss, but we all have stuff.
For the voltages that you mentioned earlier, those 2.2kohm resistors would be fine for limiting the LED current to a couple of mA. That should be fine. The LED is just an indicator - not necessary for function - so location is not critical.
Does the SSR have an indicator LED? If so, then adding another would be redundant.
It took longer to write your stuff than it would have to search "op amp LED output" or "led current limit resistor" or such. I'm not trying to be rude, hoss, but we all have stuff.
Does the SSR have an indicator LED? If so, then adding another would be redundant.
Well, lost my first reply again. Something about the interface I don't notice that something didn't post until it's too late, and going back doesn't restore what was typed an it does in some sites.
Anywho, The Fotek SSRs do have indicator lights, but the Crydom, do not. And the SSR might be tens of feet away with the prop that they are controlling. Perhaps even hidden behind/under part of the set. So having a indicator with the audio driver box could be useful.
Too often I have spent considerable time on failed searches which I thought were well worded, but apparently not. I've been out of this so long I'm not even sure of the proper vocabulary to use.
Okay, here is what I think tricks my vision on this site. When I do a "reply with quote" I get a box to enter my reply. Then when done, the most noticeable thing right under the box is the "Reply to Thread" button, which does not post what I just typed in, but starts an new and empty reply box and loosing my first reply.
Comments
Also I was wondering if the output from the Op Amp can drive (2) transistors, one for an LED, and one for the SSR which has its own, slightly different voltage power supply.(I have a mix of SSRs, some 3v-30v, some 12v-30v. I have the first wired with 6v, the other (2) 9v batteries or 18v, of course.
At this time I can't afford more than about $5 to finish what I started. I would like to take the first 2-channel prototype to a meeting this weekend to demonstrate it and I have only one 2N2222 left for only 1-channel of the prototype. (Yes, there really are people in the world who are that poor.)
More hardy ... that depends on what type of damage the 2N2222 sustained ... mechanical? There is not anything particularly critical about the specific transistor, provided the blocking voltage and rated current are appropriate. It is not likely to dissipate much power in this circuit as it is driving an LED and/or a relay.
The maximum output of a typical op amp is about 30mA, which is plenty for driving 2 transistors in this circuit. However this is not necessary. If it is not convenient to wire the LED to the relay-controlling transistor, then the LED (and current-limiting resistor) can be wired from the output of the op amp to ground. It will still indicate the status of the output that way.
I think I damaged the 2N2222s by wiring them wrong when I moved the componets on the breadboard. I built a simple LED lighting circuit and the two don't work, but remaining third spare does.
Is there a recommended place in the circuit to place the LED, or just try it experimentally at different places, and what resistor should be used. I have some LEDs in a box and otherwise know nothing about them.
Sorry that I don't have time to research this myself and asking too many questions. I'm doing lots of things at the same time. Right now my co-writer from Europe is messing me about every 10 seconds and she gets mad when I don't reply quick enough. This goes on for a couple hours. Then I got to do (write, edit, research) what we talked about. THen I have to find someone that can help us make a pitch video for free so that we can launch a Kickstarter campaign. Because right now I have $1 in the bank and we need to register the screenplays and get money to enter the projects in contests, which most want entry fees. Maybe even hire a "script doctor" to spot problems in the screenplays. Then I have to finish some props for a someone else's web series called "Zops" (a zombie series). I have to script our pitch video and make some digital art for it. Then I have to do some creative cooking each day so that I'm not eating plain pasta every day.Being dyslexic, I screwed up my assistance paper work and now that is getting delayed. And I screwed up my transistors for the circuit (hoping to demo it this weekend at a filmmaking meeting) because I was overly tired. So that's the reason for all the stupid annoying questions.
"2N222" is a typo ... I just saw it when I searched for npn. The product link is actually for:
"5 of 2N2222, 5 of 2N4401 and 5 of 2N3904"
These are all 40V rated, but vary from 200mA to 1A current rating to the best of my memory. I do not expect any issue with any of them if the SSR and/or LED are the loads.
It took longer to write your stuff than it would have to search "op amp LED output" or "led current limit resistor" or such. I'm not trying to be rude, hoss, but we all have stuff.
For the voltages that you mentioned earlier, those 2.2kohm resistors would be fine for limiting the LED current to a couple of mA. That should be fine. The LED is just an indicator - not necessary for function - so location is not critical.
Does the SSR have an indicator LED? If so, then adding another would be redundant.
Well, lost my first reply again. Something about the interface I don't notice that something didn't post until it's too late, and going back doesn't restore what was typed an it does in some sites.
Anywho, The Fotek SSRs do have indicator lights, but the Crydom, do not. And the SSR might be tens of feet away with the prop that they are controlling. Perhaps even hidden behind/under part of the set. So having a indicator with the audio driver box could be useful.
Too often I have spent considerable time on failed searches which I thought were well worded, but apparently not. I've been out of this so long I'm not even sure of the proper vocabulary to use.
Anyway, thanks again.
Henry