Today's Message Index:
----------------------
1. 06:57 AM - Re: Current advice on Battery charger/tenders? (Radioflyer)
2. 08:31 AM - Re: Re: Current advice on Battery charger/tenders? (Robert L. Nuckolls, III)
3. 04:43 PM - AEC 9009 Audio Amplifier Troubleshooting Questions (Jared Yates)
4. 05:33 PM - Photo FET Optocoupler (John Grosse)
5. 06:38 PM - Re: Photo FET Optocoupler (Daniel Hooper)
6. 07:49 PM - Re: AEC 9009 Audio Amplifier Troubleshooting Questions (Robert L. Nuckolls, III)
7. 07:57 PM - Re: Photo FET Optocoupler (Robert L. Nuckolls, III)
8. 08:00 PM - Re: Photo FET Optocoupler (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Current advice on Battery charger/tenders? |
Ok, I'll try out another shumacher. I just picked up the "Speed Charge" name from
the shumacher website (SC series). I'll see what I find at wall mart or autozone.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343040#343040
Message 2
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Subject: | Re: Current advice on Battery charger/tenders? |
At 09:53 AM 6/15/2011, you wrote:
>
>Ok, I'll try out another shumacher. I just picked up the "Speed
>Charge" name from the shumacher website (SC series). I'll see what I
>find at wall mart or autozone.
Aha! I guess I was out of the loop on Schumacher's
advertising. Seems the whole line of Schumacher
products bear the 'speed charge' label.
I've uploaded some Schumacher user's manuals to
the website at:
http://aeroelectric.com/Mfgr_Data/Battery_Chargers/
Walmart offers several chargers in this line
starting with the 1562 and moving up.
I'll keep an eye open for your 1562 . . . it's
got to be in that pile of stuff somewhere . . .
Bob . . .
Message 3
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Subject: | AEC 9009 Audio Amplifier Troubleshooting Questions |
I just got to the point where I can test my home-made audio amplifier, but
it isn't working yet, and I was hoping I might be able to get some help from
those who have built the circuit before to help narrow down the
troubleshooting. I wired it up, applied power, and it blew the 1A fuse. I
looked everything over to be sure that I didn't have any obvious shorts and
couldn't find any. Just to be sure that the rest of the wiring wasn't the
problem, I removed all of the wires except for the power and ground, but it
still blows the fuse. I went through each component and verified the
placement of the ICs and resistors. I did notice that I had one capacitor
backwards, number 127, 1uF capacitor. I reversed it but still didn't notice
any difference. Is there an easy way to test a capacitor to see if it is
still good? There isn't any physical damage to any of them.
I replaced the fuse with my multimeter leads to try and measure how much
current it was taking, but the meter read zero, so I turned off the switch
after a second or so. After that test the 317 was warm, but not hot, and
nothing seemed to be smoking.
Here are some pictures of the board:
http://jaredyates.com/temp/aec9009/P1010764.JPG
http://jaredyates.com/temp/aec9009/P1010765.JPG<http://jaredyates.com/temp/aec9009/P1010764.JPG>
http://jaredyates.com/temp/aec9009/P1010766.JPG<http://jaredyates.com/temp/aec9009/P1010764.JPG>
http://jaredyates.com/temp/aec9009/P1010767.JPG<http://jaredyates.com/temp/aec9009/P1010764.JPG>
I had to make some substitutions in the capacitor part numbers due to
digikey stock changes, but the resistors and ICs are all per specs.
Does anyone have any suggestions on what to check next?
Message 4
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Subject: | Photo FET Optocoupler |
I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it to
turn on a bulb that draws 28 mA. I can't find a suitable relay, but I
was thinking that a photo FET optocoupler might work. The problem is
that I have no experience with these, and although I understand how they
work, I don't know how to find a particular one that will work with my
application. Could anyone suggest a part number for me? It would be
appreciated.
John Grosse
Message 5
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Subject: | Re: Photo FET Optocoupler |
How about a radioshack 2N2222 BJT transistor?
Feed your signal into a 2.2K resistor.
Other side of 2.2K resistor goes into the transistor base (B) terminal.
+12V (or 5V) power into the bulb
bulb to the collector (C) of the transistor
Emitter (E) of the transistor to ground
You can give it a rough test using a 5v source (or 3 AA batteries for 4.5V) and
a 470 Ohm resistor.
Hope that helps!
--Daniel
On Jun 15, 2011, at 7:30 PM, John Grosse wrote:
>
> I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it to turn
on a bulb that draws 28 mA. I can't find a suitable relay, but I was thinking
that a photo FET optocoupler might work. The problem is that I have no experience
with these, and although I understand how they work, I don't know how to
find a particular one that will work with my application. Could anyone suggest
a part number for me? It would be appreciated.
>
> John Grosse
>
>
>
>
Message 6
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Subject: | Re: AEC 9009 Audio Amplifier Troubleshooting Questions |
At 07:39 PM 6/15/2011, you wrote:
>I just got to the point where I can test my home-made audio
>amplifier, but it isn't working yet, and I was hoping I might be
>able to get some help from those who have built the circuit before
>to help narrow down the troubleshooting. I wired it up, applied
>power, and it blew the 1A fuse. I looked everything over to be sure
>that I didn't have any obvious shorts and couldn't find any. Just
>to be sure that the rest of the wiring wasn't the problem, I removed
>all of the wires except for the power and ground, but it still blows
>the fuse. I went through each component and verified the placement
>of the ICs and resistors. I did notice that I had one capacitor
>backwards, number 127, 1uF capacitor. I reversed it but still
>didn't notice any difference. Is there an easy way to test a
>capacitor to see if it is still good? There isn't any physical
>damage to any of them.
Hmmm . . . I wish I had called out sockets under the
amplifiers so that the builder can power it up with the
ic's out.
Capacitor size is not terribly critical but polarity
is. MOST of the times you get a hot LM317 is for
a reversed capacitor C122.
Do an ohmmeter test from pin 6 to ground on either
of the two amplifier chips. It should be non-zero.
Actual measurement depends on your ohmmeter and
polarity of the ohmmeter connections. The main
thing is that it should be some substantial number
showing that the path is not shorted.
>I replaced the fuse with my multimeter leads to try and measure how
>much current it was taking, but the meter read zero, so I turned off
>the switch after a second or so. After that test the 317 was warm,
>but not hot, and nothing seemed to be smoking.
When powered up, you should have just under 9v
on pin 6 of the two amplifiers. I don't know how
you heat up the LM317 with zero current. Check
the measurement setup.
Bob . . .
Message 7
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Subject: | Re: Photo FET Optocoupler |
At 08:30 PM 6/15/2011, you wrote:
>
>I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it
>to turn on a bulb that draws 28 mA. I can't find a suitable relay,
>but I was thinking that a photo FET optocoupler might work. The
>problem is that I have no experience with these, and although I
>understand how they work, I don't know how to find a particular one
>that will work with my application. Could anyone suggest a part
>number for me? It would be appreciated.
Doesn't need to be a photo-fet. There are plenty of LED
couplers that would work. Is the 5v output measured with
respect to ground . . . and does it go to zero volts
in the off state? Can you turn the bulb on by pulling
its control lead to ground? 28 mA lamp sounds like an
LED, no?
Emacs!
Bob . . .
Message 8
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Subject: | Re: Photo FET Optocoupler |
At 08:30 PM 6/15/2011, you wrote:
>
>I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it
>to turn on a bulb that draws 28 mA. I can't find a suitable relay,
>but I was thinking that a photo FET optocoupler might work. The
>problem is that I have no experience with these, and although I
>understand how they work, I don't know how to find a particular one
>that will work with my application. Could anyone suggest a part
>number for me? It would be appreciated.
Doesn't need to be a photo-fet. There are plenty of LED
couplers that would work. Is the 5v output measured with
respect to ground . . . and does it go to zero volts
in the off state? Can you turn the bulb on by pulling
its control lead to ground? 28 mA lamp sounds like an
LED, no?
Emacs!
OOPS! You said pressure gage? Is this output a linear
voltage that represents pressure or some voltage that is
zero some times and 5v other times?
Bob . . .
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