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  #11  
Old 07-24-2016, 07:26 PM
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The pot incident? It sure did, zero current flowed after the event.

Got a transistor question, a bit reluctant to ask but considerable effort at self help producing the needed result. No smoke involved, just application/concept information.
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Useful Ford Vehicle Resources:

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  #12  
Old 07-24-2016, 07:27 PM
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Ask away, dunno if I will know or not.
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  #13  
Old 07-24-2016, 07:43 PM
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Well.....................


Frequently when I see a bipolar NPN used for switching (and other things) the load is located between the + voltage source and the collector. Conversely, when a bipolar PNP is used, the load is typically between the collector and the ground. Same idea for both NPN and PNP.

So back to the NPN, is there a performance pitfall/adverse consequence if the load is located between the emitter and ground? I realize the base current is additive to what's coming out the emitter, but the base current is trivial.

-----------------------------------------

Then comes questions about DC voltage doublers (which is how I came across the Joule Thief), using gain possibly in the form of a Darlington pair or a Sziklai pair, dive into and spent a ton of time getting up to speed on MOSFETS (voltage based, not current), or something else not even known about at this time............
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Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
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  #14  
Old 07-24-2016, 07:55 PM
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From what I can recall there are no pitfalls of either, the choice will depend on the circuit design.

I do remember that one of them (can't remember which) was not available in high current applications (think pnp) and it caused issues for high wattage amplifiers.
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  #15  
Old 07-24-2016, 08:02 PM
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The NPN config is fine for audio amps; trouble here is, that config for a dome light makes using the vehicle chassis for ground not possible. To use a PNP to get around this would require using an op-amp that has a negative voltage on one of the rails, that way the input to the op amp could be inverting and thus, the PNP would work. Trouble with that is, vehicles don't just happen to have a negative voltage to make this work. This is what drove the change here to a different op amp, one designed for situations where this was a concern.

The big bummer right now is, the best I can get for voltage on the lamp is 10.75 and the reason for this is, the damn NPN transistor gobbles up 1.97 volts. Running out of ideas for curing the issue, but I do know that to use an inverting input requires usage of a dual power supply, the negative voltage rail thing. Scratch that.
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-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

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Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp

Last edited by CowboyBilly9Mile; 07-24-2016 at 08:05 PM.
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  #16  
Old 07-24-2016, 08:11 PM
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Weird that it is dropping that much...should be the same as a diode typically .7 volt for a regular diode.

Just doing a little reading...you just have the one transistor that is switching the load from the IC output?
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  #17  
Old 07-24-2016, 08:24 PM
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Quote:
Originally Posted by DNFXDLI View Post
Weird that it is dropping that much...should be the same as a diode typically .7 volt for a regular diode.

Just doing a little reading...you just have the one transistor that is switching the load from the IC output?
BE drop is about .7 volt and yes to the second ?

As a test, I tried running just the IC on +18 volts, the rated max, in an attempt to divorce the amp performance from any input influences. There was a slight benefit, but not much. The draw of the op amp was measured (with a probably not super accurate HF DMM) and it looks like it consumes 900uA. Now comes the Joule Thief. Serious. It is very simple, can ~ double the voltage of a 1.5V aa battery and run a 3 or 5mm LED. Those LED's consume........ about 20mA. Joule Thief was more than just a joke, lol, it is a thought for now. My guess is, it's dirty power.

Before it's forgotten, per the spec for the op amp the voltage on it's inputs was dropped (me went down 1.2V, spec calls for 1.5V). This does affect the output of course, but it's noted that IF full voltage (+12.8) is applied to the transistor base, that MOL the needed voltage on the bulb can be had. Which brings the story back to, voltage doubler (somehow), darlintons, etc etc. Kinda backed into a corner here, looking for ideas and a direction, not spoon fed answer. That wouldn't involve any additional *joy* learning.
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-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
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  #18  
Old 07-24-2016, 08:36 PM
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Just wondering if you need a follower....2nd transistor in the circuit...not a darlington though.
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  #19  
Old 07-24-2016, 08:49 PM
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Quote:
Originally Posted by DNFXDLI View Post
Just wondering if you need a follower....2nd transistor in the circuit...not a darlington though.
I did try something like that earlier (pre understanding days of darlingtion, etc), I'd have to go back and sift through my notes. A PNP was added to the initial design that had just an NPN so as to address the issue of needing two wires to the dome light and not being able to use the vehicle chassis. I do know that whatever the config was, that the fading occurred over a very narrow range of diminishing voltage on the transistor base and fade didn't occur immediately after voltage to the charged cap was shut off.

The idea of trying to pair two transistors (MJE3055T and MJE2955T) and just seeing what it takes to get 12.3 or better on the lamp has crossed my mind. If successful, then tweak more of the circuit upstream of the op amp (reduce ranger of op amp input voltage using a divider? Mess with components affecting fade time? Resistor to mess with base voltage on the transistor(s)?) has come to mind last week.

Any ref to a very simpler follower circuit? BTW, the op amp itself is just a voltage follower.
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-Bill

-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp

Last edited by CowboyBilly9Mile; 07-24-2016 at 08:52 PM.
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  #20  
Old 07-24-2016, 08:59 PM
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